diff --git a/.gitignore b/.gitignore
index d0f692a..800b812 100644
--- a/.gitignore
+++ b/.gitignore
@@ -90,6 +90,7 @@
 /git-ls-tree
 /git-mailinfo
 /git-mailsplit
+/git-maintenance
 /git-merge
 /git-merge-base
 /git-merge-index
diff --git a/Documentation/RelNotes/2.29.0.txt b/Documentation/RelNotes/2.29.0.txt
index 67d9801..41a78a4 100644
--- a/Documentation/RelNotes/2.29.0.txt
+++ b/Documentation/RelNotes/2.29.0.txt
@@ -67,6 +67,49 @@
  * "git worktree add" learns that the "-d" is a synonym to "--detach"
    option to create a new worktree without being on a branch.
 
+ * "format-patch --range-diff=<prev> <origin>..HEAD" has been taught
+   not to ignore <origin> when <prev> is a single version.
+
+ * "add -p" now allows editing paths that were only added in intent.
+
+ * The 'meld' backend of the "git mergetool" learned to give the
+   underlying 'meld' the '--auto-merge' option, which would help
+   reduce the amount of text that requires manual merging.
+
+ * "git for-each-ref" and friends that list refs used to allow only
+   one --merged or --no-merged to filter them; they learned to take
+   combination of both kind of filtering.
+
+ * "git maintenance", a "git gc"'s big brother, has been introduced to
+   take care of more repository maintenance tasks, not limited to the
+   object database cleaning.
+
+ * "git receive-pack" that accepts requests by "git push" learned to
+   outsource most of the ref updates to the new "proc-receive" hook.
+
+ * "git push" that wants to be atomic and wants to send push
+   certificate learned not to prepare and sign the push certificate
+   when it fails the local check (hence due to atomicity it is known
+   that no certificate is needed).
+
+ * "git commit-graph write" learned to limit the number of bloom
+   filters that are computed from scratch with the --max-new-filters
+   option.
+
+ * The transport protocol v2 has become the default again.
+
+ * The installation procedure learned to optionally omit "git-foo"
+   executable files for each 'foo' built-in subcommand, which are only
+   required by old timers that still rely on the age old promise that
+   prepending "git --exec-path" output to PATH early in their script
+   will keep the "git-foo" calls they wrote working.
+
+ * The command line completion (in contrib/) learned that "git restore
+   -s <TAB>" is often followed by a refname.
+
+ * "git shortlog" has been taught to group commits by the contents of
+   the trailer lines, like "Reviewed-by:", "Coauthored-by:", etc.
+
 
 Performance, Internal Implementation, Development Support etc.
 
@@ -155,6 +198,12 @@
  * Allow maintainers to tweak $(TAR) invocations done while making
    distribution tarballs.
 
+ * "git index-pack" learned to resolve deltified objects with greater
+   parallelism.
+
+ * "diff-highlight" (in contrib/) had a logic to flush its output upon
+   seeing a blank line but the way it detected a blank line was broken.
+
 
 Fixes since v2.28
 -----------------
@@ -336,6 +385,62 @@
    early and cleanly when started outside a git repository.
    (merge 378fe5fc3d mt/config-fail-nongit-early later to maint).
 
+ * There is a logic to estimate how many objects are in the
+   repository, which is mean to run once per process invocation, but
+   it ran every time the estimated value was requested.
+   (merge 67bb65de5d jk/dont-count-existing-objects-twice later to maint).
+
+ * "git remote set-head" that failed still said something that hints
+   the operation went through, which was misleading.
+   (merge 5a07c6c3c2 cs/don-t-pretend-a-failed-remote-set-head-succeeded later to maint).
+
+ * "git fetch --all --ipv4/--ipv6" forgot to pass the protocol options
+   to instances of the "git fetch" that talk to individual remotes,
+   which has been corrected.
+   (merge 4e735c1326 ar/fetch-ipversion-in-all later to maint).
+
+ * The "unshelve" subcommand of "git p4" used incorrectly used
+   commit^N where it meant to say commit~N to name the Nth generation
+   ancestor, which has been corrected.
+   (merge 0acbf5997f ld/p4-unshelve-fix later to maint).
+
+ * "git clone" that clones from SHA-1 repository, while
+   GIT_DEFAULT_HASH set to use SHA-256 already, resulted in an
+   unusable repository that half-claims to be SHA-256 repository
+   with SHA-1 objects and refs.  This has been corrected.
+
+ * Adjust sample hooks for hash algorithm other than SHA-1.
+   (merge d8d3d632f4 dl/zero-oid-in-hooks later to maint).
+
+ * "git range-diff" showed incorrect diffstat, which has been
+   corrected.
+
+ * Earlier we taught "git pull" to warn when the user does not say the
+   histories need to be merged, rebased or accepts only fast-
+   forwarding, but the warning triggered for those who have set the
+   pull.ff configuration variable.
+   (merge 54200cef86 ah/pull later to maint).
+
+ * Compilation fix around type punning.
+   (merge 176380fd11 jk/drop-unaligned-loads later to maint).
+
+ * "git blame --ignore-rev/--ignore-revs-file" failed to validate
+   their input are valid revision, and failed to take into account
+   that the user may want to give an annotated tag instead of a
+   commit, which has been corrected.
+   (merge 610e2b9240 jc/blame-ignore-fix later to maint).
+
+ * "git bisect start X Y", when X and Y are not valid committish
+   object names, should take X and Y as pathspec, but didn't.
+   (merge 73c6de06af cc/bisect-start-fix later to maint).
+
+ * The explanation of the "scissors line" has been clarified.
+   (merge 287416dba6 eg/mailinfo-doc-scissors later to maint).
+
+ * A race that leads to an access to a free'd data was corrected in
+   the codepath that reads pack files.
+   (merge bda959c476 mt/delta-base-cache-races later to maint).
+
  * Other code cleanup, docfix, build fix, etc.
    (merge 84544f2ea3 sk/typofixes later to maint).
    (merge b17f411ab5 ar/help-guides-doc later to maint).
@@ -366,3 +471,5 @@
    (merge e6d5a11fed al/t3200-back-on-a-branch later to maint).
    (merge 324efcf6b6 pw/add-p-leakfix later to maint).
    (merge 1c6ffb546b jk/add-i-fixes later to maint).
+   (merge e40e936551 cd/commit-graph-doc later to maint).
+   (merge 0512eabd91 jc/sequencer-stopped-sha-simplify later to maint).
diff --git a/Documentation/config.txt b/Documentation/config.txt
index 3042d80..bf706b9 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -340,6 +340,8 @@
 
 include::config/commit.txt[]
 
+include::config/commitgraph.txt[]
+
 include::config/credential.txt[]
 
 include::config/completion.txt[]
@@ -398,6 +400,8 @@
 
 include::config/mailmap.txt[]
 
+include::config/maintenance.txt[]
+
 include::config/man.txt[]
 
 include::config/merge.txt[]
diff --git a/Documentation/config/commitgraph.txt b/Documentation/config/commitgraph.txt
new file mode 100644
index 0000000..4582c39
--- /dev/null
+++ b/Documentation/config/commitgraph.txt
@@ -0,0 +1,8 @@
+commitGraph.maxNewFilters::
+	Specifies the default value for the `--max-new-filters` option of `git
+	commit-graph write` (c.f., linkgit:git-commit-graph[1]).
+
+commitGraph.readChangedPaths::
+	If true, then git will use the changed-path Bloom filters in the
+	commit-graph file (if it exists, and they are present). Defaults to
+	true. See linkgit:git-commit-graph[1] for more information.
diff --git a/Documentation/config/core.txt b/Documentation/config/core.txt
index 74619a9..02002cf 100644
--- a/Documentation/config/core.txt
+++ b/Documentation/config/core.txt
@@ -399,7 +399,7 @@
 Common unit suffixes of 'k', 'm', or 'g' are supported.
 
 core.deltaBaseCacheLimit::
-	Maximum number of bytes to reserve for caching base objects
+	Maximum number of bytes per thread to reserve for caching base objects
 	that may be referenced by multiple deltified objects.  By storing the
 	entire decompressed base objects in a cache Git is able
 	to avoid unpacking and decompressing frequently used base
diff --git a/Documentation/config/feature.txt b/Documentation/config/feature.txt
index c0cbf2b..cdecd04 100644
--- a/Documentation/config/feature.txt
+++ b/Documentation/config/feature.txt
@@ -14,10 +14,6 @@
 +
 * `fetch.negotiationAlgorithm=skipping` may improve fetch negotiation times by
 skipping more commits at a time, reducing the number of round trips.
-+
-* `protocol.version=2` speeds up fetches from repositories with many refs by
-allowing the client to specify which refs to list before the server lists
-them.
 
 feature.manyFiles::
 	Enable config options that optimize for repos with many files in the
diff --git a/Documentation/config/fmt-merge-msg.txt b/Documentation/config/fmt-merge-msg.txt
index a8e8f74..3fbf40e 100644
--- a/Documentation/config/fmt-merge-msg.txt
+++ b/Documentation/config/fmt-merge-msg.txt
@@ -13,7 +13,7 @@
 	By adding a glob that matches the names of integration
 	branches to this multi-valued configuration variable, the
 	default merge message computed for merges into these
-	integration branches will omit " into <branch name>" from
+	integration branches will omit "into <branch name>" from
 	its title.
 +
 An element with an empty value can be used to clear the list
diff --git a/Documentation/config/maintenance.txt b/Documentation/config/maintenance.txt
new file mode 100644
index 0000000..7cc6700
--- /dev/null
+++ b/Documentation/config/maintenance.txt
@@ -0,0 +1,16 @@
+maintenance.<task>.enabled::
+	This boolean config option controls whether the maintenance task
+	with name `<task>` is run when no `--task` option is specified to
+	`git maintenance run`. These config values are ignored if a
+	`--task` option exists. By default, only `maintenance.gc.enabled`
+	is true.
+
+maintenance.commit-graph.auto::
+	This integer config option controls how often the `commit-graph` task
+	should be run as part of `git maintenance run --auto`. If zero, then
+	the `commit-graph` task will not run with the `--auto` option. A
+	negative value will force the task to run every time. Otherwise, a
+	positive value implies the command should run when the number of
+	reachable commits that are not in the commit-graph file is at least
+	the value of `maintenance.commit-graph.auto`. The default value is
+	100.
diff --git a/Documentation/config/mergetool.txt b/Documentation/config/mergetool.txt
index 09ed31d..16a2744 100644
--- a/Documentation/config/mergetool.txt
+++ b/Documentation/config/mergetool.txt
@@ -30,6 +30,16 @@
 	to `true` tells Git to unconditionally use the `--output` option,
 	and `false` avoids using `--output`.
 
+mergetool.meld.useAutoMerge::
+	When the `--auto-merge` is given, meld will merge all non-conflicting
+	parts automatically, highlight the conflicting parts and wait for
+	user decision.  Setting `mergetool.meld.useAutoMerge` to `true` tells
+	Git to unconditionally use the `--auto-merge` option with `meld`.
+	Setting this value to `auto` makes git detect whether `--auto-merge`
+	is supported and will only use `--auto-merge` when available.  A
+	value of `false` avoids using `--auto-merge` altogether, and is the
+	default value.
+
 mergetool.keepBackup::
 	After performing a merge, the original file with conflict markers
 	can be saved as a file with a `.orig` extension.  If this variable
diff --git a/Documentation/config/protocol.txt b/Documentation/config/protocol.txt
index c46e9b3..756591d 100644
--- a/Documentation/config/protocol.txt
+++ b/Documentation/config/protocol.txt
@@ -48,8 +48,7 @@
 	If set, clients will attempt to communicate with a server
 	using the specified protocol version.  If the server does
 	not support it, communication falls back to version 0.
-	If unset, the default is `0`, unless `feature.experimental`
-	is enabled, in which case the default is `2`.
+	If unset, the default is `2`.
 	Supported versions:
 +
 --
diff --git a/Documentation/config/receive.txt b/Documentation/config/receive.txt
index 65f78aa..85d5b5a 100644
--- a/Documentation/config/receive.txt
+++ b/Documentation/config/receive.txt
@@ -114,6 +114,28 @@
 	An attempt to update or delete a hidden ref by `git push` is
 	rejected.
 
+receive.procReceiveRefs::
+	This is a multi-valued variable that defines reference prefixes
+	to match the commands in `receive-pack`.  Commands matching the
+	prefixes will be executed by an external hook "proc-receive",
+	instead of the internal `execute_commands` function.  If this
+	variable is not defined, the "proc-receive" hook will never be
+	used, and all commands will be executed by the internal
+	`execute_commands` function.
++
+For example, if this variable is set to "refs/for", pushing to reference
+such as "refs/for/master" will not create or update a reference named
+"refs/for/master", but may create or update a pull request directly by
+running the hook "proc-receive".
++
+Optional modifiers can be provided in the beginning of the value to filter
+commands for specific actions: create (a), modify (m), delete (d).
+A `!` can be included in the modifiers to negate the reference prefix entry.
+E.g.:
++
+	git config --system --add receive.procReceiveRefs ad:refs/heads
+	git config --system --add receive.procReceiveRefs !:refs/heads
+
 receive.updateServerInfo::
 	If set to true, git-receive-pack will run git-update-server-info
 	after receiving data from git-push and updating refs.
diff --git a/Documentation/config/uploadpack.txt b/Documentation/config/uploadpack.txt
index ee7b3ac..b0d7612 100644
--- a/Documentation/config/uploadpack.txt
+++ b/Documentation/config/uploadpack.txt
@@ -70,7 +70,7 @@
 	kinds must be allowed. Defaults to `uploadpackfilter.allow`.
 
 uploadpackfilter.tree.maxDepth::
-	Only allow `--filter=tree=<n>` when `n` is no more than the value of
+	Only allow `--filter=tree:<n>` when `<n>` is no more than the value of
 	`uploadpackfilter.tree.maxDepth`. If set, this also implies
 	`uploadpackfilter.tree.allow=true`, unless this configuration
 	variable had already been set. Has no effect if unset.
diff --git a/Documentation/fetch-options.txt b/Documentation/fetch-options.txt
index e8104c0..2bf77b4 100644
--- a/Documentation/fetch-options.txt
+++ b/Documentation/fetch-options.txt
@@ -95,9 +95,11 @@
 	Allow several <repository> and <group> arguments to be
 	specified. No <refspec>s may be specified.
 
+--[no-]auto-maintenance::
 --[no-]auto-gc::
-	Run `git gc --auto` at the end to perform garbage collection
-	if needed. This is enabled by default.
+	Run `git maintenance run --auto` at the end to perform automatic
+	repository maintenance if needed. (`--[no-]auto-gc` is a synonym.)
+	This is enabled by default.
 
 --[no-]write-commit-graph::
 	Write a commit-graph after fetching. This overrides the config
diff --git a/Documentation/git-branch.txt b/Documentation/git-branch.txt
index 03c0824..ace4ad3 100644
--- a/Documentation/git-branch.txt
+++ b/Documentation/git-branch.txt
@@ -11,7 +11,7 @@
 'git branch' [--color[=<when>] | --no-color] [--show-current]
 	[-v [--abbrev=<length> | --no-abbrev]]
 	[--column[=<options>] | --no-column] [--sort=<key>]
-	[(--merged | --no-merged) [<commit>]]
+	[--merged [<commit>]] [--no-merged [<commit>]]
 	[--contains [<commit>]] [--no-contains [<commit>]]
 	[--points-at <object>] [--format=<format>]
 	[(-r | --remotes) | (-a | --all)]
@@ -252,13 +252,11 @@
 
 --merged [<commit>]::
 	Only list branches whose tips are reachable from the
-	specified commit (HEAD if not specified). Implies `--list`,
-	incompatible with `--no-merged`.
+	specified commit (HEAD if not specified). Implies `--list`.
 
 --no-merged [<commit>]::
 	Only list branches whose tips are not reachable from the
-	specified commit (HEAD if not specified). Implies `--list`,
-	incompatible with `--merged`.
+	specified commit (HEAD if not specified). Implies `--list`.
 
 <branchname>::
 	The name of the branch to create or delete.
@@ -370,6 +368,8 @@
 - `--no-merged` is used to find branches which are candidates for merging
   into HEAD, since those branches are not fully contained by HEAD.
 
+include::ref-reachability-filters.txt[]
+
 SEE ALSO
 --------
 linkgit:git-check-ref-format[1],
diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
index c898310..097e6a8 100644
--- a/Documentation/git-clone.txt
+++ b/Documentation/git-clone.txt
@@ -78,9 +78,9 @@
 other Git command that makes any existing commit unreferenced) in the
 source repository, some objects may become unreferenced (or dangling).
 These objects may be removed by normal Git operations (such as `git commit`)
-which automatically call `git gc --auto`. (See linkgit:git-gc[1].)
-If these objects are removed and were referenced by the cloned repository,
-then the cloned repository will become corrupt.
+which automatically call `git maintenance run --auto`. (See
+linkgit:git-maintenance[1].) If these objects are removed and were referenced
+by the cloned repository, then the cloned repository will become corrupt.
 +
 Note that running `git repack` without the `--local` option in a repository
 cloned with `--shared` will copy objects from the source repository into a pack
diff --git a/Documentation/git-commit-graph.txt b/Documentation/git-commit-graph.txt
index 17405c7..de6b6de 100644
--- a/Documentation/git-commit-graph.txt
+++ b/Documentation/git-commit-graph.txt
@@ -67,6 +67,13 @@
 that this option was intended. Use `--no-changed-paths` to stop storing this
 data.
 +
+With the `--max-new-filters=<n>` option, generate at most `n` new Bloom
+filters (if `--changed-paths` is specified). If `n` is `-1`, no limit is
+enforced. Only commits present in the new layer count against this
+limit. To retroactively compute Bloom filters over earlier layers, it is
+advised to use `--split=replace`.  Overrides the `commitGraph.maxNewFilters`
+configuration.
++
 With the `--split[=<strategy>]` option, write the commit-graph as a
 chain of multiple commit-graph files stored in
 `<dir>/info/commit-graphs`. Commit-graph layers are merged based on the
diff --git a/Documentation/git-for-each-ref.txt b/Documentation/git-for-each-ref.txt
index 616ce46..2962f85 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -11,7 +11,7 @@
 'git for-each-ref' [--count=<count>] [--shell|--perl|--python|--tcl]
 		   [(--sort=<key>)...] [--format=<format>] [<pattern>...]
 		   [--points-at=<object>]
-		   (--merged[=<object>] | --no-merged[=<object>])
+		   [--merged[=<object>]] [--no-merged[=<object>]]
 		   [--contains[=<object>]] [--no-contains[=<object>]]
 
 DESCRIPTION
@@ -76,13 +76,11 @@
 
 --merged[=<object>]::
 	Only list refs whose tips are reachable from the
-	specified commit (HEAD if not specified),
-	incompatible with `--no-merged`.
+	specified commit (HEAD if not specified).
 
 --no-merged[=<object>]::
 	Only list refs whose tips are not reachable from the
-	specified commit (HEAD if not specified),
-	incompatible with `--merged`.
+	specified commit (HEAD if not specified).
 
 --contains[=<object>]::
 	Only list refs which contain the specified commit (HEAD if not
@@ -408,6 +406,11 @@
 database; in this case, it is undefined which copy's size or delta base
 will be reported.
 
+NOTES
+-----
+
+include::ref-reachability-filters.txt[]
+
 SEE ALSO
 --------
 linkgit:git-show-ref[1]
diff --git a/Documentation/git-mailinfo.txt b/Documentation/git-mailinfo.txt
index 3bbc731..7a6aed0 100644
--- a/Documentation/git-mailinfo.txt
+++ b/Documentation/git-mailinfo.txt
@@ -72,10 +72,9 @@
 	is useful in order to associate commits with mailing list discussions.
 
 --scissors::
-	Remove everything in body before a scissors line.  A line that
-	mainly consists of scissors (either ">8" or "8<") and perforation
-	(dash "-") marks is called a scissors line, and is used to request
-	the reader to cut the message at that line.  If such a line
+	Remove everything in body before a scissors line (e.g. "-- >8 --").
+	The line represents scissors and perforation marks, and is used to
+	request the reader to cut the message at that line.  If that line
 	appears in the body of the message before the patch, everything
 	before it (including the scissors line itself) is ignored when
 	this option is used.
diff --git a/Documentation/git-maintenance.txt b/Documentation/git-maintenance.txt
new file mode 100644
index 0000000..6abcb82
--- /dev/null
+++ b/Documentation/git-maintenance.txt
@@ -0,0 +1,79 @@
+git-maintenance(1)
+==================
+
+NAME
+----
+git-maintenance - Run tasks to optimize Git repository data
+
+
+SYNOPSIS
+--------
+[verse]
+'git maintenance' run [<options>]
+
+
+DESCRIPTION
+-----------
+Run tasks to optimize Git repository data, speeding up other Git commands
+and reducing storage requirements for the repository.
+
+Git commands that add repository data, such as `git add` or `git fetch`,
+are optimized for a responsive user experience. These commands do not take
+time to optimize the Git data, since such optimizations scale with the full
+size of the repository while these user commands each perform a relatively
+small action.
+
+The `git maintenance` command provides flexibility for how to optimize the
+Git repository.
+
+SUBCOMMANDS
+-----------
+
+run::
+	Run one or more maintenance tasks. If one or more `--task` options
+	are specified, then those tasks are run in that order. Otherwise,
+	the tasks are determined by which `maintenance.<task>.enabled`
+	config options are true. By default, only `maintenance.gc.enabled`
+	is true.
+
+TASKS
+-----
+
+commit-graph::
+	The `commit-graph` job updates the `commit-graph` files incrementally,
+	then verifies that the written data is correct. The incremental
+	write is safe to run alongside concurrent Git processes since it
+	will not expire `.graph` files that were in the previous
+	`commit-graph-chain` file. They will be deleted by a later run based
+	on the expiration delay.
+
+gc::
+	Clean up unnecessary files and optimize the local repository. "GC"
+	stands for "garbage collection," but this task performs many
+	smaller tasks. This task can be expensive for large repositories,
+	as it repacks all Git objects into a single pack-file. It can also
+	be disruptive in some situations, as it deletes stale data. See
+	linkgit:git-gc[1] for more details on garbage collection in Git.
+
+OPTIONS
+-------
+--auto::
+	When combined with the `run` subcommand, run maintenance tasks
+	only if certain thresholds are met. For example, the `gc` task
+	runs when the number of loose objects exceeds the number stored
+	in the `gc.auto` config setting, or when the number of pack-files
+	exceeds the `gc.autoPackLimit` config setting.
+
+--quiet::
+	Do not report progress or other information over `stderr`.
+
+--task=<task>::
+	If this option is specified one or more times, then only run the
+	specified tasks in the specified order. If no `--task=<task>`
+	arguments are specified, then only the tasks with
+	`maintenance.<task>.enabled` configured as `true` are considered.
+	See the 'TASKS' section for the list of accepted `<task>` values.
+
+GIT
+---
+Part of the linkgit:git[1] suite
diff --git a/Documentation/git-shortlog.txt b/Documentation/git-shortlog.txt
index a72ea7f..fd93cd4 100644
--- a/Documentation/git-shortlog.txt
+++ b/Documentation/git-shortlog.txt
@@ -47,9 +47,38 @@
 
 	Each pretty-printed commit will be rewrapped before it is shown.
 
+--group=<type>::
+	Group commits based on `<type>`. If no `--group` option is
+	specified, the default is `author`. `<type>` is one of:
++
+--
+ - `author`, commits are grouped by author
+ - `committer`, commits are grouped by committer (the same as `-c`)
+ - `trailer:<field>`, the `<field>` is interpreted as a case-insensitive
+   commit message trailer (see linkgit:git-interpret-trailers[1]). For
+   example, if your project uses `Reviewed-by` trailers, you might want
+   to see who has been reviewing with
+   `git shortlog -ns --group=trailer:reviewed-by`.
++
+Note that commits that do not include the trailer will not be counted.
+Likewise, commits with multiple trailers (e.g., multiple signoffs) may
+be counted more than once (but only once per unique trailer value in
+that commit).
++
+Shortlog will attempt to parse each trailer value as a `name <email>`
+identity. If successful, the mailmap is applied and the email is omitted
+unless the `--email` option is specified. If the value cannot be parsed
+as an identity, it will be taken literally and completely.
+--
++
+If `--group` is specified multiple times, commits are counted under each
+value (but again, only once per unique value in that commit). For
+example, `git shortlog --group=author --group=trailer:co-authored-by`
+counts both authors and co-authors.
+
 -c::
 --committer::
-	Collect and show committer identities instead of authors.
+	This is an alias for `--group=committer`.
 
 -w[<width>[,<indent1>[,<indent2>]]]::
 	Linewrap the output by wrapping each line at `width`.  The first
diff --git a/Documentation/git-tag.txt b/Documentation/git-tag.txt
index f6d9791..56656d1 100644
--- a/Documentation/git-tag.txt
+++ b/Documentation/git-tag.txt
@@ -15,7 +15,7 @@
 'git tag' [-n[<num>]] -l [--contains <commit>] [--no-contains <commit>]
 	[--points-at <object>] [--column[=<options>] | --no-column]
 	[--create-reflog] [--sort=<key>] [--format=<format>]
-	[--[no-]merged [<commit>]] [<pattern>...]
+	[--merged <commit>] [--no-merged <commit>] [<pattern>...]
 'git tag' -v [--format=<format>] <tagname>...
 
 DESCRIPTION
@@ -149,11 +149,11 @@
 
 --merged [<commit>]::
 	Only list tags whose commits are reachable from the specified
-	commit (`HEAD` if not specified), incompatible with `--no-merged`.
+	commit (`HEAD` if not specified).
 
 --no-merged [<commit>]::
 	Only list tags whose commits are not reachable from the specified
-	commit (`HEAD` if not specified), incompatible with `--merged`.
+	commit (`HEAD` if not specified).
 
 --points-at <object>::
 	Only list tags of the given object (HEAD if not
@@ -377,6 +377,11 @@
 
 include::date-formats.txt[]
 
+NOTES
+-----
+
+include::ref-reachability-filters.txt[]
+
 SEE ALSO
 --------
 linkgit:git-check-ref-format[1].
diff --git a/Documentation/git.txt b/Documentation/git.txt
index 2f72b10..c463b93 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -722,6 +722,10 @@
 	time of each Git command.
 	See `GIT_TRACE` for available trace output options.
 
+`GIT_TRACE_REFS`::
+	Enables trace messages for operations on the ref database.
+	See `GIT_TRACE` for available trace output options.
+
 `GIT_TRACE_SETUP`::
 	Enables trace messages printing the .git, working tree and current
 	working directory after Git has completed its setup phase.
diff --git a/Documentation/gitfaq.txt b/Documentation/gitfaq.txt
index 9cd7a59..afdaeab 100644
--- a/Documentation/gitfaq.txt
+++ b/Documentation/gitfaq.txt
@@ -241,6 +241,59 @@
 	ignore the upstream changes.  A pull consists of a fetch followed
 	immediately by either a merge or rebase.  See linkgit:git-pull[1].
 
+Merging and Rebasing
+--------------------
+
+[[long-running-squash-merge]]
+What kinds of problems can occur when merging long-lived branches with squash merges?::
+	In general, there are a variety of problems that can occur when using squash
+	merges to merge two branches multiple times.  These can include seeing extra
+	commits in `git log` output, with a GUI, or when using the `...` notation to
+	express a range, as well as the possibility of needing to re-resolve conflicts
+	again and again.
++
+When Git does a normal merge between two branches, it considers exactly three
+points: the two branches and a third commit, called the _merge base_, which is
+usually the common ancestor of the commits.  The result of the merge is the sum
+of the changes between the merge base and each head.  When you merge two
+branches with a regular merge commit, this results in a new commit which will
+end up as a merge base when they're merged again, because there is now a new
+common ancestor.  Git doesn't have to consider changes that occurred before the
+merge base, so you don't have to re-resolve any conflicts you resolved before.
++
+When you perform a squash merge, a merge commit isn't created; instead, the
+changes from one side are applied as a regular commit to the other side.  This
+means that the merge base for these branches won't have changed, and so when Git
+goes to perform its next merge, it considers all of the changes that it
+considered the last time plus the new changes.  That means any conflicts may
+need to be re-resolved.  Similarly, anything using the `...` notation in `git
+diff`, `git log`, or a GUI will result in showing all of the changes since the
+original merge base.
++
+As a consequence, if you want to merge two long-lived branches repeatedly, it's
+best to always use a regular merge commit.
+
+[[merge-two-revert-one]]
+If I make a change on two branches but revert it on one, why does the merge of those branches include the change?::
+	By default, when Git does a merge, it uses a strategy called the recursive
+	strategy, which does a fancy three-way merge.  In such a case, when Git
+	performs the merge, it considers exactly three points: the two heads and a
+	third point, called the _merge base_, which is usually the common ancestor of
+	those commits.  Git does not consider the history or the individual commits
+	that have happened on those branches at all.
++
+As a result, if both sides have a change and one side has reverted that change,
+the result is to include the change.  This is because the code has changed on
+one side and there is no net change on the other, and in this scenario, Git
+adopts the change.
++
+If this is a problem for you, you can do a rebase instead, rebasing the branch
+with the revert onto the other branch.  A rebase in this scenario will revert
+the change, because a rebase applies each individual commit, including the
+revert.  Note that rebases rewrite history, so you should avoid rebasing
+published branches unless you're sure you're comfortable with that.  See the
+NOTES section in linkgit:git-rebase[1] for more details.
+
 Hooks
 -----
 
@@ -310,6 +363,39 @@
 You can also control this behavior with the `core.whitespace` setting if you
 don't wish to remove the carriage returns from your line endings.
 
+[[always-modified-files-case]]
+Why do I have a file that's always modified?::
+	Internally, Git always stores file names as sequences of bytes and doesn't
+	perform any encoding or case folding.  However, Windows and macOS by default
+	both perform case folding on file names.  As a result, it's possible to end up
+	with multiple files or directories whose names differ only in case.  Git can
+	handle this just fine, but the file system can store only one of these files,
+	so when Git reads the other file to see its contents, it looks modified.
++
+It's best to remove one of the files such that you only have one file.  You can
+do this with commands like the following (assuming two files `AFile.txt` and
+`afile.txt`) on an otherwise clean working tree:
++
+----
+$ git rm --cached AFile.txt
+$ git commit -m 'Remove files conflicting in case'
+$ git checkout .
+----
++
+This avoids touching the disk, but removes the additional file.  Your project
+may prefer to adopt a naming convention, such as all-lowercase names, to avoid
+this problem from occurring again; such a convention can be checked using a
+`pre-receive` hook or as part of a continuous integration (CI) system.
++
+It is also possible for perpetually modified files to occur on any platform if a
+smudge or clean filter is in use on your system but a file was previously
+committed without running the smudge or clean filter.  To fix this, run the
+following on an otherwise clean working tree:
++
+----
+$ git add --renormalize .
+----
+
 [[recommended-storage-settings]]
 What's the recommended way to store files in Git?::
 	While Git can store and handle any file of any type, there are some
diff --git a/Documentation/githooks.txt b/Documentation/githooks.txt
index cf95d6d..6e461ac 100644
--- a/Documentation/githooks.txt
+++ b/Documentation/githooks.txt
@@ -335,6 +335,68 @@
 `hooks.allowunannotated` config option unset or set to false--prevents
 unannotated tags to be pushed.
 
+[[proc-receive]]
+proc-receive
+~~~~~~~~~~~~
+
+This hook is invoked by linkgit:git-receive-pack[1].  If the server has
+set the multi-valued config variable `receive.procReceiveRefs`, and the
+commands sent to 'receive-pack' have matching reference names, these
+commands will be executed by this hook, instead of by the internal
+`execute_commands()` function.  This hook is responsible for updating
+the relevant references and reporting the results back to 'receive-pack'.
+
+This hook executes once for the receive operation.  It takes no
+arguments, but uses a pkt-line format protocol to communicate with
+'receive-pack' to read commands, push-options and send results.  In the
+following example for the protocol, the letter 'S' stands for
+'receive-pack' and the letter 'H' stands for this hook.
+
+    # Version and features negotiation.
+    S: PKT-LINE(version=1\0push-options atomic...)
+    S: flush-pkt
+    H: PKT-LINE(version=1\0push-options...)
+    H: flush-pkt
+
+    # Send commands from server to the hook.
+    S: PKT-LINE(<old-oid> <new-oid> <ref>)
+    S: ... ...
+    S: flush-pkt
+    # Send push-options only if the 'push-options' feature is enabled.
+    S: PKT-LINE(push-option)
+    S: ... ...
+    S: flush-pkt
+
+    # Receive result from the hook.
+    # OK, run this command successfully.
+    H: PKT-LINE(ok <ref>)
+    # NO, I reject it.
+    H: PKT-LINE(ng <ref> <reason>)
+    # Fall through, let 'receive-pack' to execute it.
+    H: PKT-LINE(ok <ref>)
+    H: PKT-LINE(option fall-through)
+    # OK, but has an alternate reference.  The alternate reference name
+    # and other status can be given in option directives.
+    H: PKT-LINE(ok <ref>)
+    H: PKT-LINE(option refname <refname>)
+    H: PKT-LINE(option old-oid <old-oid>)
+    H: PKT-LINE(option new-oid <new-oid>)
+    H: PKT-LINE(option forced-update)
+    H: ... ...
+    H: flush-pkt
+
+Each command for the 'proc-receive' hook may point to a pseudo-reference
+and always has a zero-old as its old-oid, while the 'proc-receive' hook
+may update an alternate reference and the alternate reference may exist
+already with a non-zero old-oid.  For this case, this hook will use
+"option" directives to report extended attributes for the reference given
+by the leading "ok" directive.
+
+The report of the commands of this hook should have the same order as
+the input.  The exit status of the 'proc-receive' hook only determines
+the success or failure of the group of commands sent to it, unless
+atomic push is in use.
+
 [[post-receive]]
 post-receive
 ~~~~~~~~~~~~
diff --git a/Documentation/ref-reachability-filters.txt b/Documentation/ref-reachability-filters.txt
new file mode 100644
index 0000000..9bae46d
--- /dev/null
+++ b/Documentation/ref-reachability-filters.txt
@@ -0,0 +1,7 @@
+When combining multiple `--contains` and `--no-contains` filters, only
+references that contain at least one of the `--contains` commits and
+contain none of the `--no-contains` commits are shown.
+
+When combining multiple `--merged` and `--no-merged` filters, only
+references that are reachable from at least one of the `--merged`
+commits and from none of the `--no-merged` commits are shown.
diff --git a/Documentation/technical/commit-graph-format.txt b/Documentation/technical/commit-graph-format.txt
index 6ddbceb..b3b5888 100644
--- a/Documentation/technical/commit-graph-format.txt
+++ b/Documentation/technical/commit-graph-format.txt
@@ -82,7 +82,7 @@
   Commit Data (ID: {'C', 'D', 'A', 'T' }) (N * (H + 16) bytes)
     * The first H bytes are for the OID of the root tree.
     * The next 8 bytes are for the positions of the first two parents
-      of the ith commit. Stores value 0x7000000 if no parent in that
+      of the ith commit. Stores value 0x70000000 if no parent in that
       position. If there are more than two parents, the second value
       has its most-significant bit on and the other bits store an array
       position into the Extra Edge List chunk.
@@ -125,7 +125,7 @@
     * The rest of the chunk is the concatenation of all the computed Bloom
       filters for the commits in lexicographic order.
     * Note: Commits with no changes or more than 512 changes have Bloom filters
-      of length zero.
+      of length one, with either all bits set to zero or one respectively.
     * The BDAT chunk is present if and only if BIDX is present.
 
   Base Graphs List (ID: {'B', 'A', 'S', 'E'}) [Optional]
diff --git a/Documentation/technical/pack-protocol.txt b/Documentation/technical/pack-protocol.txt
index a4573d1..e13a2c0 100644
--- a/Documentation/technical/pack-protocol.txt
+++ b/Documentation/technical/pack-protocol.txt
@@ -503,8 +503,8 @@
 fetching protocol. Each reference obj-id and name on the server is sent
 in packet-line format to the client, followed by a flush-pkt.  The only
 real difference is that the capability listing is different - the only
-possible values are 'report-status', 'delete-refs', 'ofs-delta' and
-'push-options'.
+possible values are 'report-status', 'report-status-v2', 'delete-refs',
+'ofs-delta', 'atomic' and 'push-options'.
 
 Reference Update Request and Packfile Transfer
 ----------------------------------------------
@@ -625,7 +625,7 @@
 -------------
 
 After receiving the pack data from the sender, the receiver sends a
-report if 'report-status' capability is in effect.
+report if 'report-status' or 'report-status-v2' capability is in effect.
 It is a short listing of what happened in that update.  It will first
 list the status of the packfile unpacking as either 'unpack ok' or
 'unpack [error]'.  Then it will list the status for each of the references
@@ -647,6 +647,41 @@
   error-msg         = 1*(OCTET) ; where not "ok"
 ----
 
+The 'report-status-v2' capability extends the protocol by adding new option
+lines in order to support reporting of reference rewritten by the
+'proc-receive' hook.  The 'proc-receive' hook may handle a command for a
+pseudo-reference which may create or update one or more references, and each
+reference may have different name, different new-oid, and different old-oid.
+
+----
+  report-status-v2  = unpack-status
+		      1*(command-status-v2)
+		      flush-pkt
+
+  unpack-status     = PKT-LINE("unpack" SP unpack-result)
+  unpack-result     = "ok" / error-msg
+
+  command-status-v2 = command-ok-v2 / command-fail
+  command-ok-v2     = command-ok
+		      *option-line
+
+  command-ok        = PKT-LINE("ok" SP refname)
+  command-fail      = PKT-LINE("ng" SP refname SP error-msg)
+
+  error-msg         = 1*(OCTET) ; where not "ok"
+
+  option-line       = *1(option-refname)
+		      *1(option-old-oid)
+		      *1(option-new-oid)
+		      *1(option-forced-update)
+
+  option-refname    = PKT-LINE("option" SP "refname" SP refname)
+  option-old-oid    = PKT-LINE("option" SP "old-oid" SP obj-id)
+  option-new-oid    = PKT-LINE("option" SP "new-oid" SP obj-id)
+  option-force      = PKT-LINE("option" SP "forced-update")
+
+----
+
 Updates can be unsuccessful for a number of reasons.  The reference can have
 changed since the reference discovery phase was originally sent, meaning
 someone pushed in the meantime.  The reference being pushed could be a
diff --git a/Documentation/technical/protocol-capabilities.txt b/Documentation/technical/protocol-capabilities.txt
index 124d716..ba869a7 100644
--- a/Documentation/technical/protocol-capabilities.txt
+++ b/Documentation/technical/protocol-capabilities.txt
@@ -22,9 +22,9 @@
 and server advertised.  As a consequence of these rules, server MUST
 NOT advertise capabilities it does not understand.
 
-The 'atomic', 'report-status', 'delete-refs', 'quiet', and 'push-cert'
-capabilities are sent and recognized by the receive-pack (push to server)
-process.
+The 'atomic', 'report-status', 'report-status-v2', 'delete-refs', 'quiet',
+and 'push-cert' capabilities are sent and recognized by the receive-pack
+(push to server) process.
 
 The 'ofs-delta' and 'side-band-64k' capabilities are sent and recognized
 by both upload-pack and receive-pack protocols.  The 'agent' capability
@@ -284,6 +284,17 @@
 successful, it will send back an error message.  See pack-protocol.txt
 for example messages.
 
+report-status-v2
+----------------
+
+Capability 'report-status-v2' extends capability 'report-status' by
+adding new "option" directives in order to support reference rewritten by
+the "proc-receive" hook.  The "proc-receive" hook may handle a command
+for a pseudo-reference which may create or update a reference with
+different name, new-oid, and old-oid.  While the capability
+'report-status' cannot report for such case.  See pack-protocol.txt
+for details.
+
 delete-refs
 -----------
 
diff --git a/Makefile b/Makefile
index f1b1bc8..fb521da 100644
--- a/Makefile
+++ b/Makefile
@@ -348,6 +348,9 @@
 # Define NO_INSTALL_HARDLINKS if you prefer to use either symbolic links or
 # copies to install built-in git commands e.g. git-cat-file.
 #
+# Define SKIP_DASHED_BUILT_INS if you do not need the dashed versions of the
+# built-ins to be linked/copied at all.
+#
 # Define USE_NED_ALLOCATOR if you want to replace the platforms default
 # memory allocators with the nedmalloc allocator written by Niall Douglas.
 #
@@ -720,6 +723,7 @@
 TEST_BUILTINS_OBJS += test-path-utils.o
 TEST_BUILTINS_OBJS += test-pkt-line.o
 TEST_BUILTINS_OBJS += test-prio-queue.o
+TEST_BUILTINS_OBJS += test-proc-receive.o
 TEST_BUILTINS_OBJS += test-progress.o
 TEST_BUILTINS_OBJS += test-reach.o
 TEST_BUILTINS_OBJS += test-read-cache.o
@@ -774,6 +778,16 @@
 # what 'all' will build and 'install' will install in gitexecdir,
 # excluding programs for built-in commands
 ALL_PROGRAMS = $(PROGRAMS) $(SCRIPTS)
+ALL_COMMANDS_TO_INSTALL = $(ALL_PROGRAMS)
+ifeq (,$(SKIP_DASHED_BUILT_INS))
+ALL_COMMANDS_TO_INSTALL += $(BUILT_INS)
+else
+# git-upload-pack, git-receive-pack and git-upload-archive are special: they
+# are _expected_ to be present in the `bin/` directory in their dashed form.
+ALL_COMMANDS_TO_INSTALL += git-receive-pack$(X)
+ALL_COMMANDS_TO_INSTALL += git-upload-archive$(X)
+ALL_COMMANDS_TO_INSTALL += git-upload-pack$(X)
+endif
 
 # what 'all' will build but not install in gitexecdir
 OTHER_PROGRAMS = git$X
@@ -889,7 +903,6 @@
 LIB_OBJS += help.o
 LIB_OBJS += hex.o
 LIB_OBJS += ident.o
-LIB_OBJS += interdiff.o
 LIB_OBJS += json-writer.o
 LIB_OBJS += kwset.o
 LIB_OBJS += levenshtein.o
@@ -956,6 +969,7 @@
 LIB_OBJS += ref-filter.o
 LIB_OBJS += reflog-walk.o
 LIB_OBJS += refs.o
+LIB_OBJS += refs/debug.o
 LIB_OBJS += refs/files-backend.o
 LIB_OBJS += refs/iterator.o
 LIB_OBJS += refs/packed-backend.o
@@ -1218,7 +1232,6 @@
 BASIC_CFLAGS += -fsanitize=$(SANITIZE) -fno-sanitize-recover=$(SANITIZE)
 BASIC_CFLAGS += -fno-omit-frame-pointer
 ifneq ($(filter undefined,$(SANITIZERS)),)
-BASIC_CFLAGS += -DNO_UNALIGNED_LOADS
 BASIC_CFLAGS += -DSHA1DC_FORCE_ALIGNED_ACCESS
 endif
 ifneq ($(filter leak,$(SANITIZERS)),)
@@ -2088,9 +2101,9 @@
 	$(MAKE) PROFILE=USE all
 
 
-all:: $(ALL_PROGRAMS) $(SCRIPT_LIB) $(BUILT_INS) $(OTHER_PROGRAMS) GIT-BUILD-OPTIONS
+all:: $(ALL_COMMANDS_TO_INSTALL) $(SCRIPT_LIB) $(OTHER_PROGRAMS) GIT-BUILD-OPTIONS
 ifneq (,$X)
-	$(QUIET_BUILT_IN)$(foreach p,$(patsubst %$X,%,$(filter %$X,$(ALL_PROGRAMS) $(BUILT_INS) git$X)), test -d '$p' -o '$p' -ef '$p$X' || $(RM) '$p';)
+	$(QUIET_BUILT_IN)$(foreach p,$(patsubst %$X,%,$(filter %$X,$(ALL_COMMANDS_TO_INSTALL) git$X)), test -d '$p' -o '$p' -ef '$p$X' || $(RM) '$p';)
 endif
 
 all::
@@ -2921,15 +2934,8 @@
 	# have already been rolled up into the exe's pdb file.
 	# We DO NOT have pdb files for the builtin commands (like git-status.exe)
 	# because it is just a copy/hardlink of git.exe, rather than a unique binary.
-	$(INSTALL) git.pdb '$(DESTDIR_SQ)$(bindir_SQ)'
-	$(INSTALL) git-shell.pdb '$(DESTDIR_SQ)$(bindir_SQ)'
-	$(INSTALL) git-daemon.pdb '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
-	$(INSTALL) git-http-backend.pdb '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
-	$(INSTALL) git-http-fetch.pdb '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
-	$(INSTALL) git-http-push.pdb '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
-	$(INSTALL) git-imap-send.pdb '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
-	$(INSTALL) git-remote-http.pdb '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
-	$(INSTALL) git-sh-i18n--envsubst.pdb '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
+	$(INSTALL) $(patsubst %.exe,%.pdb,$(filter-out $(BUILT_INS),$(patsubst %,%$X,$(BINDIR_PROGRAMS_NEED_X)))) '$(DESTDIR_SQ)$(bindir_SQ)'
+	$(INSTALL) $(patsubst %.exe,%.pdb,$(filter-out $(BUILT_INS) $(REMOTE_CURL_ALIASES),$(PROGRAMS))) '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
 ifndef DEBUG
 	$(INSTALL) $(vcpkg_rel_bin)/*.dll '$(DESTDIR_SQ)$(bindir_SQ)'
 	$(INSTALL) $(vcpkg_rel_bin)/*.pdb '$(DESTDIR_SQ)$(bindir_SQ)'
@@ -2957,7 +2963,7 @@
 	$(MAKE) -C git-gui gitexecdir='$(gitexec_instdir_SQ)' install
 endif
 ifneq (,$X)
-	$(foreach p,$(patsubst %$X,%,$(filter %$X,$(ALL_PROGRAMS) $(BUILT_INS) git$X)), test '$(DESTDIR_SQ)$(gitexec_instdir_SQ)/$p' -ef '$(DESTDIR_SQ)$(gitexec_instdir_SQ)/$p$X' || $(RM) '$(DESTDIR_SQ)$(gitexec_instdir_SQ)/$p';)
+	$(foreach p,$(patsubst %$X,%,$(filter %$X,$(ALL_COMMANDS_TO_INSTALL) git$X)), test '$(DESTDIR_SQ)$(gitexec_instdir_SQ)/$p' -ef '$(DESTDIR_SQ)$(gitexec_instdir_SQ)/$p$X' || $(RM) '$(DESTDIR_SQ)$(gitexec_instdir_SQ)/$p';)
 endif
 
 	bindir=$$(cd '$(DESTDIR_SQ)$(bindir_SQ)' && pwd) && \
@@ -2975,21 +2981,27 @@
 	} && \
 	for p in $(filter $(install_bindir_programs),$(BUILT_INS)); do \
 		$(RM) "$$bindir/$$p" && \
-		test -n "$(INSTALL_SYMLINKS)" && \
-		ln -s "git$X" "$$bindir/$$p" || \
-		{ test -z "$(NO_INSTALL_HARDLINKS)" && \
-		  ln "$$bindir/git$X" "$$bindir/$$p" 2>/dev/null || \
-		  ln -s "git$X" "$$bindir/$$p" 2>/dev/null || \
-		  cp "$$bindir/git$X" "$$bindir/$$p" || exit; } \
+		if test -z "$(SKIP_DASHED_BUILT_INS)"; \
+		then \
+			test -n "$(INSTALL_SYMLINKS)" && \
+			ln -s "git$X" "$$bindir/$$p" || \
+			{ test -z "$(NO_INSTALL_HARDLINKS)" && \
+			  ln "$$bindir/git$X" "$$bindir/$$p" 2>/dev/null || \
+			  ln -s "git$X" "$$bindir/$$p" 2>/dev/null || \
+			  cp "$$bindir/git$X" "$$bindir/$$p" || exit; }; \
+		fi \
 	done && \
 	for p in $(BUILT_INS); do \
 		$(RM) "$$execdir/$$p" && \
-		test -n "$(INSTALL_SYMLINKS)" && \
-		ln -s "$$destdir_from_execdir_SQ/$(bindir_relative_SQ)/git$X" "$$execdir/$$p" || \
-		{ test -z "$(NO_INSTALL_HARDLINKS)" && \
-		  ln "$$execdir/git$X" "$$execdir/$$p" 2>/dev/null || \
-		  ln -s "git$X" "$$execdir/$$p" 2>/dev/null || \
-		  cp "$$execdir/git$X" "$$execdir/$$p" || exit; } \
+		if test -z "$(SKIP_DASHED_BUILT_INS)"; \
+		then \
+			test -n "$(INSTALL_SYMLINKS)" && \
+			ln -s "$$destdir_from_execdir_SQ/$(bindir_relative_SQ)/git$X" "$$execdir/$$p" || \
+			{ test -z "$(NO_INSTALL_HARDLINKS)" && \
+			  ln "$$execdir/git$X" "$$execdir/$$p" 2>/dev/null || \
+			  ln -s "git$X" "$$execdir/$$p" 2>/dev/null || \
+			  cp "$$execdir/git$X" "$$execdir/$$p" || exit; }; \
+		fi \
 	done && \
 	remote_curl_aliases="$(REMOTE_CURL_ALIASES)" && \
 	for p in $$remote_curl_aliases; do \
@@ -3083,7 +3095,7 @@
 OTHER_PROGRAMS += $(shell echo *.dll t/helper/*.dll)
 endif
 
-artifacts-tar:: $(ALL_PROGRAMS) $(SCRIPT_LIB) $(BUILT_INS) $(OTHER_PROGRAMS) \
+artifacts-tar:: $(ALL_COMMANDS_TO_INSTALL) $(SCRIPT_LIB) $(OTHER_PROGRAMS) \
 		GIT-BUILD-OPTIONS $(TEST_PROGRAMS) $(test_bindir_programs) \
 		$(MOFILES)
 	$(QUIET_SUBDIR0)templates $(QUIET_SUBDIR1) \
@@ -3178,7 +3190,7 @@
 
 ### Check documentation
 #
-ALL_COMMANDS = $(ALL_PROGRAMS) $(SCRIPT_LIB) $(BUILT_INS)
+ALL_COMMANDS = $(ALL_COMMANDS_TO_INSTALL) $(SCRIPT_LIB)
 ALL_COMMANDS += git
 ALL_COMMANDS += git-citool
 ALL_COMMANDS += git-gui
@@ -3218,7 +3230,7 @@
 		    -e 's/\.txt//'; \
 	) | while read how cmd; \
 	do \
-		case " $(patsubst %$X,%,$(ALL_COMMANDS) $(EXCLUDED_PROGRAMS)) " in \
+		case " $(patsubst %$X,%,$(ALL_COMMANDS) $(BUILT_INS) $(EXCLUDED_PROGRAMS)) " in \
 		*" $$cmd "*)	;; \
 		*) echo "removed but $$how: $$cmd" ;; \
 		esac; \
diff --git a/add-patch.c b/add-patch.c
index cd5cfc9..bd94bd3 100644
--- a/add-patch.c
+++ b/add-patch.c
@@ -465,7 +465,7 @@
 	pend = p + plain->len;
 	while (p != pend) {
 		char *eol = memchr(p, '\n', pend - p);
-		const char *deleted = NULL, *added = NULL, *mode_change = NULL;
+		const char *deleted = NULL, *mode_change = NULL;
 
 		if (!eol)
 			eol = pend;
@@ -482,12 +482,11 @@
 		} else if (p == plain->buf)
 			BUG("diff starts with unexpected line:\n"
 			    "%.*s\n", (int)(eol - p), p);
-		else if (file_diff->deleted || file_diff->added)
+		else if (file_diff->deleted)
 			; /* keep the rest of the file in a single "hunk" */
 		else if (starts_with(p, "@@ ") ||
 			 (hunk == &file_diff->head &&
-			  (skip_prefix(p, "deleted file", &deleted) ||
-			   skip_prefix(p, "new file", &added)))) {
+			  (skip_prefix(p, "deleted file", &deleted)))) {
 			if (marker == '-' || marker == '+')
 				/*
 				 * Should not happen; previous hunk did not end
@@ -505,8 +504,6 @@
 
 			if (deleted)
 				file_diff->deleted = 1;
-			else if (added)
-				file_diff->added = 1;
 			else if (parse_hunk_header(s, hunk) < 0)
 				return -1;
 
@@ -516,6 +513,9 @@
 			 */
 			marker = *p;
 		} else if (hunk == &file_diff->head &&
+			   starts_with(p, "new file")) {
+			file_diff->added = 1;
+		} else if (hunk == &file_diff->head &&
 			   skip_prefix(p, "old mode ", &mode_change) &&
 			   is_octal(mode_change, eol - mode_change)) {
 			if (file_diff->mode_change)
@@ -1376,7 +1376,8 @@
 		ALLOW_EDIT = 1 << 6
 	} permitted = 0;
 
-	if (!file_diff->hunk_nr)
+	/* Empty added files have no hunks */
+	if (!file_diff->hunk_nr && !file_diff->added)
 		return 0;
 
 	strbuf_reset(&s->buf);
@@ -1385,21 +1386,25 @@
 	for (;;) {
 		if (hunk_index >= file_diff->hunk_nr)
 			hunk_index = 0;
-		hunk = file_diff->hunk + hunk_index;
-
+		hunk = file_diff->hunk_nr
+				? file_diff->hunk + hunk_index
+				: &file_diff->head;
 		undecided_previous = -1;
-		for (i = hunk_index - 1; i >= 0; i--)
-			if (file_diff->hunk[i].use == UNDECIDED_HUNK) {
-				undecided_previous = i;
-				break;
-			}
-
 		undecided_next = -1;
-		for (i = hunk_index + 1; i < file_diff->hunk_nr; i++)
-			if (file_diff->hunk[i].use == UNDECIDED_HUNK) {
-				undecided_next = i;
-				break;
-			}
+
+		if (file_diff->hunk_nr) {
+			for (i = hunk_index - 1; i >= 0; i--)
+				if (file_diff->hunk[i].use == UNDECIDED_HUNK) {
+					undecided_previous = i;
+					break;
+				}
+
+			for (i = hunk_index + 1; i < file_diff->hunk_nr; i++)
+				if (file_diff->hunk[i].use == UNDECIDED_HUNK) {
+					undecided_next = i;
+					break;
+				}
+		}
 
 		/* Everything decided? */
 		if (undecided_previous < 0 && undecided_next < 0 &&
@@ -1407,38 +1412,40 @@
 			break;
 
 		strbuf_reset(&s->buf);
-		render_hunk(s, hunk, 0, colored, &s->buf);
-		fputs(s->buf.buf, stdout);
+		if (file_diff->hunk_nr) {
+			render_hunk(s, hunk, 0, colored, &s->buf);
+			fputs(s->buf.buf, stdout);
 
-		strbuf_reset(&s->buf);
-		if (undecided_previous >= 0) {
-			permitted |= ALLOW_GOTO_PREVIOUS_UNDECIDED_HUNK;
-			strbuf_addstr(&s->buf, ",k");
-		}
-		if (hunk_index) {
-			permitted |= ALLOW_GOTO_PREVIOUS_HUNK;
-			strbuf_addstr(&s->buf, ",K");
-		}
-		if (undecided_next >= 0) {
-			permitted |= ALLOW_GOTO_NEXT_UNDECIDED_HUNK;
-			strbuf_addstr(&s->buf, ",j");
-		}
-		if (hunk_index + 1 < file_diff->hunk_nr) {
-			permitted |= ALLOW_GOTO_NEXT_HUNK;
-			strbuf_addstr(&s->buf, ",J");
-		}
-		if (file_diff->hunk_nr > 1) {
-			permitted |= ALLOW_SEARCH_AND_GOTO;
-			strbuf_addstr(&s->buf, ",g,/");
-		}
-		if (hunk->splittable_into > 1) {
-			permitted |= ALLOW_SPLIT;
-			strbuf_addstr(&s->buf, ",s");
-		}
-		if (hunk_index + 1 > file_diff->mode_change &&
-		    !file_diff->deleted) {
-			permitted |= ALLOW_EDIT;
-			strbuf_addstr(&s->buf, ",e");
+			strbuf_reset(&s->buf);
+			if (undecided_previous >= 0) {
+				permitted |= ALLOW_GOTO_PREVIOUS_UNDECIDED_HUNK;
+				strbuf_addstr(&s->buf, ",k");
+			}
+			if (hunk_index) {
+				permitted |= ALLOW_GOTO_PREVIOUS_HUNK;
+				strbuf_addstr(&s->buf, ",K");
+			}
+			if (undecided_next >= 0) {
+				permitted |= ALLOW_GOTO_NEXT_UNDECIDED_HUNK;
+				strbuf_addstr(&s->buf, ",j");
+			}
+			if (hunk_index + 1 < file_diff->hunk_nr) {
+				permitted |= ALLOW_GOTO_NEXT_HUNK;
+				strbuf_addstr(&s->buf, ",J");
+			}
+			if (file_diff->hunk_nr > 1) {
+				permitted |= ALLOW_SEARCH_AND_GOTO;
+				strbuf_addstr(&s->buf, ",g,/");
+			}
+			if (hunk->splittable_into > 1) {
+				permitted |= ALLOW_SPLIT;
+				strbuf_addstr(&s->buf, ",s");
+			}
+			if (hunk_index + 1 > file_diff->mode_change &&
+			    !file_diff->deleted) {
+				permitted |= ALLOW_EDIT;
+				strbuf_addstr(&s->buf, ",e");
+			}
 		}
 		if (file_diff->deleted)
 			prompt_mode_type = PROMPT_DELETION;
@@ -1452,7 +1459,9 @@
 		color_fprintf(stdout, s->s.prompt_color,
 			      "(%"PRIuMAX"/%"PRIuMAX") ",
 			      (uintmax_t)hunk_index + 1,
-			      (uintmax_t)file_diff->hunk_nr);
+			      (uintmax_t)(file_diff->hunk_nr
+						? file_diff->hunk_nr
+						: 1));
 		color_fprintf(stdout, s->s.prompt_color,
 			      _(s->mode->prompt_mode[prompt_mode_type]),
 			      s->buf.buf);
@@ -1472,16 +1481,24 @@
 			hunk->use = SKIP_HUNK;
 			goto soft_increment;
 		} else if (ch == 'a') {
-			for (; hunk_index < file_diff->hunk_nr; hunk_index++) {
-				hunk = file_diff->hunk + hunk_index;
-				if (hunk->use == UNDECIDED_HUNK)
-					hunk->use = USE_HUNK;
+			if (file_diff->hunk_nr) {
+				for (; hunk_index < file_diff->hunk_nr; hunk_index++) {
+					hunk = file_diff->hunk + hunk_index;
+					if (hunk->use == UNDECIDED_HUNK)
+						hunk->use = USE_HUNK;
+				}
+			} else if (hunk->use == UNDECIDED_HUNK) {
+				hunk->use = USE_HUNK;
 			}
 		} else if (ch == 'd' || ch == 'q') {
-			for (; hunk_index < file_diff->hunk_nr; hunk_index++) {
-				hunk = file_diff->hunk + hunk_index;
-				if (hunk->use == UNDECIDED_HUNK)
-					hunk->use = SKIP_HUNK;
+			if (file_diff->hunk_nr) {
+				for (; hunk_index < file_diff->hunk_nr; hunk_index++) {
+					hunk = file_diff->hunk + hunk_index;
+					if (hunk->use == UNDECIDED_HUNK)
+						hunk->use = SKIP_HUNK;
+				}
+			} else if (hunk->use == UNDECIDED_HUNK) {
+				hunk->use = SKIP_HUNK;
 			}
 			if (ch == 'q') {
 				quit = 1;
@@ -1639,7 +1656,8 @@
 		if (file_diff->hunk[i].use == USE_HUNK)
 			break;
 
-	if (i < file_diff->hunk_nr) {
+	if (i < file_diff->hunk_nr ||
+	    (!file_diff->hunk_nr && file_diff->head.use == USE_HUNK)) {
 		/* At least one hunk selected: apply */
 		strbuf_reset(&s->buf);
 		reassemble_patch(s, file_diff, 0, &s->buf);
diff --git a/bisect.c b/bisect.c
index d42a3a3..f5b1368 100644
--- a/bisect.c
+++ b/bisect.c
@@ -988,8 +988,11 @@
  * the bisection process finished successfully.
  * In this case the calling function or command should not turn a
  * BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND return code into an error or a non zero exit code.
- * If no_checkout is non-zero, the bisection process does not
- * checkout the trial commit but instead simply updates BISECT_HEAD.
+ *
+ * Checking BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND
+ * in bisect_helper::bisect_next() and only transforming it to 0 at
+ * the end of bisect_helper::cmd_bisect__helper() helps bypassing
+ * all the code related to finding a commit to test.
  */
 enum bisect_error bisect_next_all(struct repository *r, const char *prefix)
 {
@@ -999,6 +1002,10 @@
 	enum bisect_error res = BISECT_OK;
 	struct object_id *bisect_rev;
 	char *steps_msg;
+	/*
+	 * If no_checkout is non-zero, the bisection process does not
+	 * checkout the trial commit but instead simply updates BISECT_HEAD.
+	 */
 	int no_checkout = ref_exists("BISECT_HEAD");
 	unsigned bisect_flags = 0;
 
@@ -1082,6 +1089,8 @@
 		  "Bisecting: %d revisions left to test after this %s\n",
 		  nr), nr, steps_msg);
 	free(steps_msg);
+	/* Clean up objects used, as they will be reused. */
+	clear_commit_marks_all(ALL_REV_FLAGS);
 
 	return bisect_checkout(bisect_rev, no_checkout);
 }
diff --git a/blame.c b/blame.c
index b475bfa..686845b 100644
--- a/blame.c
+++ b/blame.c
@@ -1276,7 +1276,7 @@
 	if (commit_graph_generation(origin->commit) == GENERATION_NUMBER_INFINITY)
 		return 1;
 
-	filter = get_bloom_filter(r, origin->commit, 0);
+	filter = get_bloom_filter(r, origin->commit);
 
 	if (!filter)
 		return 1;
@@ -2892,16 +2892,18 @@
 			    const char *path)
 {
 	struct blame_bloom_data *bd;
+	struct bloom_filter_settings *bs;
 
 	if (!sb->repo->objects->commit_graph)
 		return;
 
-	if (!sb->repo->objects->commit_graph->bloom_filter_settings)
+	bs = get_bloom_filter_settings(sb->repo);
+	if (!bs)
 		return;
 
 	bd = xmalloc(sizeof(struct blame_bloom_data));
 
-	bd->settings = sb->repo->objects->commit_graph->bloom_filter_settings;
+	bd->settings = bs;
 
 	bd->alloc = 4;
 	bd->nr = 0;
diff --git a/bloom.c b/bloom.c
index 1a57322..68c7320 100644
--- a/bloom.c
+++ b/bloom.c
@@ -38,7 +38,7 @@
 	while (graph_pos < g->num_commits_in_base)
 		g = g->base_graph;
 
-	/* The commit graph commit 'c' lives in doesn't carry bloom filters. */
+	/* The commit graph commit 'c' lives in doesn't carry Bloom filters. */
 	if (!g->chunk_bloom_indexes)
 		return 0;
 
@@ -177,15 +177,25 @@
 	return strcmp(e1->path, e2->path);
 }
 
-struct bloom_filter *get_bloom_filter(struct repository *r,
-				      struct commit *c,
-				      int compute_if_not_present)
+static void init_truncated_large_filter(struct bloom_filter *filter)
+{
+	filter->data = xmalloc(1);
+	filter->data[0] = 0xFF;
+	filter->len = 1;
+}
+
+struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
+						 struct commit *c,
+						 int compute_if_not_present,
+						 const struct bloom_filter_settings *settings,
+						 enum bloom_filter_computed *computed)
 {
 	struct bloom_filter *filter;
-	struct bloom_filter_settings settings = DEFAULT_BLOOM_FILTER_SETTINGS;
 	int i;
 	struct diff_options diffopt;
-	int max_changes = 512;
+
+	if (computed)
+		*computed = BLOOM_NOT_COMPUTED;
 
 	if (!bloom_filters.slab_size)
 		return NULL;
@@ -194,12 +204,11 @@
 
 	if (!filter->data) {
 		load_commit_graph_info(r, c);
-		if (commit_graph_position(c) != COMMIT_NOT_FROM_GRAPH &&
-			r->objects->commit_graph->chunk_bloom_indexes)
+		if (commit_graph_position(c) != COMMIT_NOT_FROM_GRAPH)
 			load_bloom_filter_from_graph(r->objects->commit_graph, filter, c);
 	}
 
-	if (filter->data)
+	if (filter->data && filter->len)
 		return filter;
 	if (!compute_if_not_present)
 		return NULL;
@@ -207,7 +216,7 @@
 	repo_diff_setup(r, &diffopt);
 	diffopt.flags.recursive = 1;
 	diffopt.detect_rename = 0;
-	diffopt.max_changes = max_changes;
+	diffopt.max_changes = settings->max_changed_paths;
 	diff_setup_done(&diffopt);
 
 	/* ensure commit is parsed so we have parent information */
@@ -219,7 +228,7 @@
 		diff_tree_oid(NULL, &c->object.oid, "", &diffopt);
 	diffcore_std(&diffopt);
 
-	if (diffopt.num_changes <= max_changes) {
+	if (diff_queued_diff.nr <= settings->max_changed_paths) {
 		struct hashmap pathmap;
 		struct pathmap_hash_entry *e;
 		struct hashmap_iter iter;
@@ -256,23 +265,41 @@
 			diff_free_filepair(diff_queued_diff.queue[i]);
 		}
 
-		filter->len = (hashmap_get_size(&pathmap) * settings.bits_per_entry + BITS_PER_WORD - 1) / BITS_PER_WORD;
+		if (hashmap_get_size(&pathmap) > settings->max_changed_paths) {
+			init_truncated_large_filter(filter);
+			if (computed)
+				*computed |= BLOOM_TRUNC_LARGE;
+			goto cleanup;
+		}
+
+		filter->len = (hashmap_get_size(&pathmap) * settings->bits_per_entry + BITS_PER_WORD - 1) / BITS_PER_WORD;
+		if (!filter->len) {
+			if (computed)
+				*computed |= BLOOM_TRUNC_EMPTY;
+			filter->len = 1;
+		}
 		filter->data = xcalloc(filter->len, sizeof(unsigned char));
 
 		hashmap_for_each_entry(&pathmap, &iter, e, entry) {
 			struct bloom_key key;
-			fill_bloom_key(e->path, strlen(e->path), &key, &settings);
-			add_key_to_filter(&key, filter, &settings);
+			fill_bloom_key(e->path, strlen(e->path), &key, settings);
+			add_key_to_filter(&key, filter, settings);
 		}
 
+	cleanup:
 		hashmap_free_entries(&pathmap, struct pathmap_hash_entry, entry);
 	} else {
 		for (i = 0; i < diff_queued_diff.nr; i++)
 			diff_free_filepair(diff_queued_diff.queue[i]);
-		filter->data = NULL;
-		filter->len = 0;
+		init_truncated_large_filter(filter);
+
+		if (computed)
+			*computed |= BLOOM_TRUNC_LARGE;
 	}
 
+	if (computed)
+		*computed |= BLOOM_COMPUTED;
+
 	free(diff_queued_diff.queue);
 	DIFF_QUEUE_CLEAR(&diff_queued_diff);
 
diff --git a/bloom.h b/bloom.h
index d8fbb0f..adde6df 100644
--- a/bloom.h
+++ b/bloom.h
@@ -28,9 +28,18 @@
 	 * that contain n*b bits.
 	 */
 	uint32_t bits_per_entry;
+
+	/*
+	 * The maximum number of changed paths per commit
+	 * before declaring a Bloom filter to be too-large.
+	 *
+	 * Not written to the commit-graph file.
+	 */
+	uint32_t max_changed_paths;
 };
 
-#define DEFAULT_BLOOM_FILTER_SETTINGS { 1, 7, 10 }
+#define DEFAULT_BLOOM_MAX_CHANGES 512
+#define DEFAULT_BLOOM_FILTER_SETTINGS { 1, 7, 10, DEFAULT_BLOOM_MAX_CHANGES }
 #define BITS_PER_WORD 8
 #define BLOOMDATA_CHUNK_HEADER_SIZE 3 * sizeof(uint32_t)
 
@@ -80,9 +89,21 @@
 
 void init_bloom_filters(void);
 
-struct bloom_filter *get_bloom_filter(struct repository *r,
-				      struct commit *c,
-				      int compute_if_not_present);
+enum bloom_filter_computed {
+	BLOOM_NOT_COMPUTED = (1 << 0),
+	BLOOM_COMPUTED     = (1 << 1),
+	BLOOM_TRUNC_LARGE  = (1 << 2),
+	BLOOM_TRUNC_EMPTY  = (1 << 3),
+};
+
+struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
+						 struct commit *c,
+						 int compute_if_not_present,
+						 const struct bloom_filter_settings *settings,
+						 enum bloom_filter_computed *computed);
+
+#define get_bloom_filter(r, c) get_or_compute_bloom_filter( \
+	(r), (c), 0, NULL, NULL)
 
 int bloom_filter_contains(const struct bloom_filter *filter,
 			  const struct bloom_key *key,
diff --git a/builtin.h b/builtin.h
index ba954e1..53fb290 100644
--- a/builtin.h
+++ b/builtin.h
@@ -172,6 +172,7 @@
 int cmd_ls_remote(int argc, const char **argv, const char *prefix);
 int cmd_mailinfo(int argc, const char **argv, const char *prefix);
 int cmd_mailsplit(int argc, const char **argv, const char *prefix);
+int cmd_maintenance(int argc, const char **argv, const char *prefix);
 int cmd_merge(int argc, const char **argv, const char *prefix);
 int cmd_merge_base(int argc, const char **argv, const char *prefix);
 int cmd_merge_index(int argc, const char **argv, const char *prefix);
diff --git a/builtin/am.c b/builtin/am.c
index b5c63dd..7259186 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1813,7 +1813,7 @@
 	if (!state->rebasing) {
 		am_destroy(state);
 		close_object_store(the_repository->objects);
-		run_auto_gc(state->quiet);
+		run_auto_maintenance(state->quiet);
 	}
 }
 
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 7dcc1b5..7512b88 100644
--- a/builtin/bisect--helper.c
+++ b/builtin/bisect--helper.c
@@ -8,6 +8,7 @@
 #include "run-command.h"
 #include "prompt.h"
 #include "quote.h"
+#include "revision.h"
 
 static GIT_PATH_FUNC(git_path_bisect_terms, "BISECT_TERMS")
 static GIT_PATH_FUNC(git_path_bisect_expected_rev, "BISECT_EXPECTED_REV")
@@ -29,9 +30,17 @@
 	N_("git bisect--helper --bisect-terms [--term-good | --term-old | --term-bad | --term-new]"),
 	N_("git bisect--helper --bisect-start [--term-{new,bad}=<term> --term-{old,good}=<term>]"
 					    " [--no-checkout] [--first-parent] [<bad> [<good>...]] [--] [<paths>...]"),
+	N_("git bisect--helper --bisect-next"),
+	N_("git bisect--helper --bisect-auto-next"),
+	N_("git bisect--helper --bisect-autostart"),
 	NULL
 };
 
+struct add_bisect_ref_data {
+	struct rev_info *revs;
+	unsigned int object_flags;
+};
+
 struct bisect_terms {
 	char *term_good;
 	char *term_bad;
@@ -55,6 +64,8 @@
 static const char vocab_bad[] = "bad|new";
 static const char vocab_good[] = "good|old";
 
+static int bisect_autostart(struct bisect_terms *terms);
+
 /*
  * Check whether the string `term` belongs to the set of strings
  * included in the variable arguments.
@@ -74,6 +85,52 @@
 	return res;
 }
 
+static int write_in_file(const char *path, const char *mode, const char *format, va_list args)
+{
+	FILE *fp = NULL;
+	int res = 0;
+
+	if (strcmp(mode, "w") && strcmp(mode, "a"))
+		BUG("write-in-file does not support '%s' mode", mode);
+	fp = fopen(path, mode);
+	if (!fp)
+		return error_errno(_("cannot open file '%s' in mode '%s'"), path, mode);
+	res = vfprintf(fp, format, args);
+
+	if (res < 0) {
+		int saved_errno = errno;
+		fclose(fp);
+		errno = saved_errno;
+		return error_errno(_("could not write to file '%s'"), path);
+	}
+
+	return fclose(fp);
+}
+
+static int write_to_file(const char *path, const char *format, ...)
+{
+	int res;
+	va_list args;
+
+	va_start(args, format);
+	res = write_in_file(path, "w", format, args);
+	va_end(args);
+
+	return res;
+}
+
+static int append_to_file(const char *path, const char *format, ...)
+{
+	int res;
+	va_list args;
+
+	va_start(args, format);
+	res = write_in_file(path, "a", format, args);
+	va_end(args);
+
+	return res;
+}
+
 static int check_term_format(const char *term, const char *orig_term)
 {
 	int res;
@@ -104,7 +161,6 @@
 
 static int write_terms(const char *bad, const char *good)
 {
-	FILE *fp = NULL;
 	int res;
 
 	if (!strcmp(bad, good))
@@ -113,13 +169,9 @@
 	if (check_term_format(bad, "bad") || check_term_format(good, "good"))
 		return -1;
 
-	fp = fopen(git_path_bisect_terms(), "w");
-	if (!fp)
-		return error_errno(_("could not open the file BISECT_TERMS"));
+	res = write_to_file(git_path_bisect_terms(), "%s\n%s\n", bad, good);
 
-	res = fprintf(fp, "%s\n%s\n", bad, good);
-	res |= fclose(fp);
-	return (res < 0) ? -1 : 0;
+	return res;
 }
 
 static int is_expected_rev(const char *expected_hex)
@@ -421,6 +473,142 @@
 	return res;
 }
 
+static int add_bisect_ref(const char *refname, const struct object_id *oid,
+			  int flags, void *cb)
+{
+	struct add_bisect_ref_data *data = cb;
+
+	add_pending_oid(data->revs, refname, oid, data->object_flags);
+
+	return 0;
+}
+
+static int prepare_revs(struct bisect_terms *terms, struct rev_info *revs)
+{
+	int res = 0;
+	struct add_bisect_ref_data cb = { revs };
+	char *good = xstrfmt("%s-*", terms->term_good);
+
+	/*
+	 * We cannot use terms->term_bad directly in
+	 * for_each_glob_ref_in() and we have to append a '*' to it,
+	 * otherwise for_each_glob_ref_in() will append '/' and '*'.
+	 */
+	char *bad = xstrfmt("%s*", terms->term_bad);
+
+	/*
+	 * It is important to reset the flags used by revision walks
+	 * as the previous call to bisect_next_all() in turn
+	 * sets up a revision walk.
+	 */
+	reset_revision_walk();
+	init_revisions(revs, NULL);
+	setup_revisions(0, NULL, revs, NULL);
+	for_each_glob_ref_in(add_bisect_ref, bad, "refs/bisect/", &cb);
+	cb.object_flags = UNINTERESTING;
+	for_each_glob_ref_in(add_bisect_ref, good, "refs/bisect/", &cb);
+	if (prepare_revision_walk(revs))
+		res = error(_("revision walk setup failed\n"));
+
+	free(good);
+	free(bad);
+	return res;
+}
+
+static int bisect_skipped_commits(struct bisect_terms *terms)
+{
+	int res;
+	FILE *fp = NULL;
+	struct rev_info revs;
+	struct commit *commit;
+	struct pretty_print_context pp = {0};
+	struct strbuf commit_name = STRBUF_INIT;
+
+	res = prepare_revs(terms, &revs);
+	if (res)
+		return res;
+
+	fp = fopen(git_path_bisect_log(), "a");
+	if (!fp)
+		return error_errno(_("could not open '%s' for appending"),
+				  git_path_bisect_log());
+
+	if (fprintf(fp, "# only skipped commits left to test\n") < 0)
+		return error_errno(_("failed to write to '%s'"), git_path_bisect_log());
+
+	while ((commit = get_revision(&revs)) != NULL) {
+		strbuf_reset(&commit_name);
+		format_commit_message(commit, "%s",
+				      &commit_name, &pp);
+		fprintf(fp, "# possible first %s commit: [%s] %s\n",
+			terms->term_bad, oid_to_hex(&commit->object.oid),
+			commit_name.buf);
+	}
+
+	/*
+	 * Reset the flags used by revision walks in case
+	 * there is another revision walk after this one.
+	 */
+	reset_revision_walk();
+
+	strbuf_release(&commit_name);
+	fclose(fp);
+	return 0;
+}
+
+static int bisect_successful(struct bisect_terms *terms)
+{
+	struct object_id oid;
+	struct commit *commit;
+	struct pretty_print_context pp = {0};
+	struct strbuf commit_name = STRBUF_INIT;
+	char *bad_ref = xstrfmt("refs/bisect/%s",terms->term_bad);
+	int res;
+
+	read_ref(bad_ref, &oid);
+	commit = lookup_commit_reference_by_name(bad_ref);
+	format_commit_message(commit, "%s", &commit_name, &pp);
+
+	res = append_to_file(git_path_bisect_log(), "# first %s commit: [%s] %s\n",
+			    terms->term_bad, oid_to_hex(&commit->object.oid),
+			    commit_name.buf);
+
+	strbuf_release(&commit_name);
+	free(bad_ref);
+	return res;
+}
+
+static enum bisect_error bisect_next(struct bisect_terms *terms, const char *prefix)
+{
+	enum bisect_error res;
+
+	if (bisect_autostart(terms))
+		return BISECT_FAILED;
+
+	if (bisect_next_check(terms, terms->term_good))
+		return BISECT_FAILED;
+
+	/* Perform all bisection computation */
+	res = bisect_next_all(the_repository, prefix);
+
+	if (res == BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND) {
+		res = bisect_successful(terms);
+		return res ? res : BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND;
+	} else if (res == BISECT_ONLY_SKIPPED_LEFT) {
+		res = bisect_skipped_commits(terms);
+		return res ? res : BISECT_ONLY_SKIPPED_LEFT;
+	}
+	return res;
+}
+
+static enum bisect_error bisect_auto_next(struct bisect_terms *terms, const char *prefix)
+{
+	if (bisect_next_check(terms, NULL))
+		return BISECT_OK;
+
+	return bisect_next(terms, prefix);
+}
+
 static int bisect_start(struct bisect_terms *terms, const char **argv, int argc)
 {
 	int no_checkout = 0;
@@ -484,14 +672,13 @@
 			terms->term_bad = xstrdup(arg);
 		} else if (starts_with(arg, "--")) {
 			return error(_("unrecognized option: '%s'"), arg);
-		} else {
-			char *commit_id = xstrfmt("%s^{commit}", arg);
-			if (get_oid(commit_id, &oid) && has_double_dash)
-				die(_("'%s' does not appear to be a valid "
-				      "revision"), arg);
-
+		} else if (!get_oidf(&oid, "%s^{commit}", arg)) {
 			string_list_append(&revs, oid_to_hex(&oid));
-			free(commit_id);
+		} else if (has_double_dash) {
+			die(_("'%s' does not appear to be a valid "
+			      "revision"), arg);
+		} else {
+			break;
 		}
 	}
 	pathspec_pos = i;
@@ -624,6 +811,38 @@
 	return res;
 }
 
+static inline int file_is_not_empty(const char *path)
+{
+	return !is_empty_or_missing_file(path);
+}
+
+static int bisect_autostart(struct bisect_terms *terms)
+{
+	int res;
+	const char *yesno;
+
+	if (file_is_not_empty(git_path_bisect_start()))
+		return 0;
+
+	fprintf_ln(stderr, _("You need to start by \"git bisect "
+			  "start\"\n"));
+
+	if (!isatty(STDIN_FILENO))
+		return -1;
+
+	/*
+	 * TRANSLATORS: Make sure to include [Y] and [n] in your
+	 * translation. The program will only accept English input
+	 * at this point.
+	 */
+	yesno = git_prompt(_("Do you want me to do it for you "
+			     "[Y/n]? "), PROMPT_ECHO);
+	res = tolower(*yesno) == 'n' ?
+		-1 : bisect_start(terms, empty_strvec, 0);
+
+	return res;
+}
+
 int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 {
 	enum {
@@ -636,7 +855,10 @@
 		CHECK_AND_SET_TERMS,
 		BISECT_NEXT_CHECK,
 		BISECT_TERMS,
-		BISECT_START
+		BISECT_START,
+		BISECT_AUTOSTART,
+		BISECT_NEXT,
+		BISECT_AUTO_NEXT
 	} cmdmode = 0;
 	int res = 0, nolog = 0;
 	struct option options[] = {
@@ -660,6 +882,12 @@
 			 N_("print out the bisect terms"), BISECT_TERMS),
 		OPT_CMDMODE(0, "bisect-start", &cmdmode,
 			 N_("start the bisect session"), BISECT_START),
+		OPT_CMDMODE(0, "bisect-next", &cmdmode,
+			 N_("find the next bisection commit"), BISECT_NEXT),
+		OPT_CMDMODE(0, "bisect-auto-next", &cmdmode,
+			 N_("verify the next bisection state then checkout the next bisection commit"), BISECT_AUTO_NEXT),
+		OPT_CMDMODE(0, "bisect-autostart", &cmdmode,
+			 N_("start the bisection if it has not yet been started"), BISECT_AUTOSTART),
 		OPT_BOOL(0, "no-log", &nolog,
 			 N_("no log for BISECT_WRITE")),
 		OPT_END()
@@ -719,8 +947,26 @@
 		set_terms(&terms, "bad", "good");
 		res = bisect_start(&terms, argv, argc);
 		break;
+	case BISECT_NEXT:
+		if (argc)
+			return error(_("--bisect-next requires 0 arguments"));
+		get_terms(&terms);
+		res = bisect_next(&terms, prefix);
+		break;
+	case BISECT_AUTO_NEXT:
+		if (argc)
+			return error(_("--bisect-auto-next requires 0 arguments"));
+		get_terms(&terms);
+		res = bisect_auto_next(&terms, prefix);
+		break;
+	case BISECT_AUTOSTART:
+		if (argc)
+			return error(_("--bisect-autostart does not accept arguments"));
+		set_terms(&terms, "bad", "good");
+		res = bisect_autostart(&terms);
+		break;
 	default:
-		return error("BUG: unknown subcommand '%d'", cmdmode);
+		BUG("unknown subcommand %d", cmdmode);
 	}
 	free_terms(&terms);
 
@@ -728,8 +974,8 @@
 	 * Handle early success
 	 * From check_merge_bases > check_good_are_ancestors_of_bad > bisect_next_all
 	 */
-	if (res == BISECT_INTERNAL_SUCCESS_MERGE_BASE)
+	if ((res == BISECT_INTERNAL_SUCCESS_MERGE_BASE) || (res == BISECT_INTERNAL_SUCCESS_1ST_BAD_FOUND))
 		res = BISECT_OK;
 
-	return abs(res);
+	return -res;
 }
diff --git a/builtin/blame.c b/builtin/blame.c
index eb513fb..bb0f293 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -27,6 +27,7 @@
 #include "object-store.h"
 #include "blame.h"
 #include "refs.h"
+#include "tag.h"
 
 static char blame_usage[] = N_("git blame [<options>] [<rev-opts>] [<rev>] [--] <file>");
 
@@ -803,6 +804,26 @@
 	return OBJ_NONE < oid_object_info(the_repository, &oid, NULL);
 }
 
+static int peel_to_commit_oid(struct object_id *oid_ret, void *cbdata)
+{
+	struct repository *r = ((struct blame_scoreboard *)cbdata)->repo;
+	struct object_id oid;
+
+	oidcpy(&oid, oid_ret);
+	while (1) {
+		struct object *obj;
+		int kind = oid_object_info(r, &oid, NULL);
+		if (kind == OBJ_COMMIT) {
+			oidcpy(oid_ret, &oid);
+			return 0;
+		}
+		if (kind != OBJ_TAG)
+			return -1;
+		obj = deref_tag(r, parse_object(r, &oid), NULL, 0);
+		oidcpy(&oid, &obj->oid);
+	}
+}
+
 static void build_ignorelist(struct blame_scoreboard *sb,
 			     struct string_list *ignore_revs_file_list,
 			     struct string_list *ignore_rev_list)
@@ -815,10 +836,12 @@
 		if (!strcmp(i->string, ""))
 			oidset_clear(&sb->ignore_list);
 		else
-			oidset_parse_file(&sb->ignore_list, i->string);
+			oidset_parse_file_carefully(&sb->ignore_list, i->string,
+						    peel_to_commit_oid, sb);
 	}
 	for_each_string_list_item(i, ignore_rev_list) {
-		if (get_oid_committish(i->string, &oid))
+		if (get_oid_committish(i->string, &oid) ||
+		    peel_to_commit_oid(&oid, sb))
 			die(_("cannot find revision %s to ignore"), i->string);
 		oidset_insert(&sb->ignore_list, &oid);
 	}
diff --git a/builtin/branch.c b/builtin/branch.c
index e82301f..efb30b8 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -26,7 +26,7 @@
 #include "commit-reach.h"
 
 static const char * const builtin_branch_usage[] = {
-	N_("git branch [<options>] [-r | -a] [--merged | --no-merged]"),
+	N_("git branch [<options>] [-r | -a] [--merged] [--no-merged]"),
 	N_("git branch [<options>] [-l] [-f] <branch-name> [<start-point>]"),
 	N_("git branch [<options>] [-r] (-d | -D) <branch-name>..."),
 	N_("git branch [<options>] (-m | -M) [<old-branch>] <new-branch>"),
@@ -688,8 +688,8 @@
 	    !show_current && !unset_upstream && argc == 0)
 		list = 1;
 
-	if (filter.with_commit || filter.merge != REF_FILTER_MERGED_NONE || filter.points_at.nr ||
-	    filter.no_commit)
+	if (filter.with_commit || filter.no_commit ||
+	    filter.reachable_from || filter.unreachable_from || filter.points_at.nr)
 		list = 1;
 
 	if (!!delete + !!rename + !!copy + !!new_upstream + !!show_current +
diff --git a/builtin/clone.c b/builtin/clone.c
index fbfd656..391aa41 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -1233,7 +1233,7 @@
 		 * Now that we know what algorithm the remote side is using,
 		 * let's set ours to the same thing.
 		 */
-		initialize_repository_version(hash_algo);
+		initialize_repository_version(hash_algo, 1);
 		repo_set_hash_algo(the_repository, hash_algo);
 
 		mapped_refs = wanted_peer_refs(refs, &remote->fetch);
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index 523501f..988445a 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -13,7 +13,8 @@
 	N_("git commit-graph verify [--object-dir <objdir>] [--shallow] [--[no-]progress]"),
 	N_("git commit-graph write [--object-dir <objdir>] [--append] "
 	   "[--split[=<strategy>]] [--reachable|--stdin-packs|--stdin-commits] "
-	   "[--changed-paths] [--[no-]progress] <split options>"),
+	   "[--changed-paths] [--[no-]max-new-filters <n>] [--[no-]progress] "
+	   "<split options>"),
 	NULL
 };
 
@@ -25,7 +26,8 @@
 static const char * const builtin_commit_graph_write_usage[] = {
 	N_("git commit-graph write [--object-dir <objdir>] [--append] "
 	   "[--split[=<strategy>]] [--reachable|--stdin-packs|--stdin-commits] "
-	   "[--changed-paths] [--[no-]progress] <split options>"),
+	   "[--changed-paths] [--[no-]max-new-filters <n>] [--[no-]progress] "
+	   "<split options>"),
 	NULL
 };
 
@@ -106,7 +108,7 @@
 	FREE_AND_NULL(graph_name);
 
 	if (open_ok)
-		graph = load_commit_graph_one_fd_st(fd, &st, odb);
+		graph = load_commit_graph_one_fd_st(the_repository, fd, &st, odb);
 	else
 		graph = read_commit_graph_one(the_repository, odb);
 
@@ -119,7 +121,7 @@
 }
 
 extern int read_replace_refs;
-static struct split_commit_graph_opts split_opts;
+static struct commit_graph_opts write_opts;
 
 static int write_option_parse_split(const struct option *opt, const char *arg,
 				    int unset)
@@ -162,6 +164,35 @@
 	return 0;
 }
 
+static int write_option_max_new_filters(const struct option *opt,
+					const char *arg,
+					int unset)
+{
+	int *to = opt->value;
+	if (unset)
+		*to = -1;
+	else {
+		const char *s;
+		*to = strtol(arg, (char **)&s, 10);
+		if (*s)
+			return error(_("%s expects a numerical value"),
+				     optname(opt, opt->flags));
+	}
+	return 0;
+}
+
+static int git_commit_graph_write_config(const char *var, const char *value,
+					 void *cb)
+{
+	if (!strcmp(var, "commitgraph.maxnewfilters"))
+		write_opts.max_new_filters = git_config_int(var, value);
+	/*
+	 * No need to fall-back to 'git_default_config', since this was already
+	 * called in 'cmd_commit_graph()'.
+	 */
+	return 0;
+}
+
 static int graph_write(int argc, const char **argv)
 {
 	struct string_list pack_indexes = STRING_LIST_INIT_NODUP;
@@ -187,27 +218,33 @@
 		OPT_BOOL(0, "changed-paths", &opts.enable_changed_paths,
 			N_("enable computation for changed paths")),
 		OPT_BOOL(0, "progress", &opts.progress, N_("force progress reporting")),
-		OPT_CALLBACK_F(0, "split", &split_opts.flags, NULL,
+		OPT_CALLBACK_F(0, "split", &write_opts.split_flags, NULL,
 			N_("allow writing an incremental commit-graph file"),
 			PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 			write_option_parse_split),
-		OPT_INTEGER(0, "max-commits", &split_opts.max_commits,
+		OPT_INTEGER(0, "max-commits", &write_opts.max_commits,
 			N_("maximum number of commits in a non-base split commit-graph")),
-		OPT_INTEGER(0, "size-multiple", &split_opts.size_multiple,
+		OPT_INTEGER(0, "size-multiple", &write_opts.size_multiple,
 			N_("maximum ratio between two levels of a split commit-graph")),
-		OPT_EXPIRY_DATE(0, "expire-time", &split_opts.expire_time,
+		OPT_EXPIRY_DATE(0, "expire-time", &write_opts.expire_time,
 			N_("only expire files older than a given date-time")),
+		OPT_CALLBACK_F(0, "max-new-filters", &write_opts.max_new_filters,
+			NULL, N_("maximum number of changed-path Bloom filters to compute"),
+			0, write_option_max_new_filters),
 		OPT_END(),
 	};
 
 	opts.progress = isatty(2);
 	opts.enable_changed_paths = -1;
-	split_opts.size_multiple = 2;
-	split_opts.max_commits = 0;
-	split_opts.expire_time = 0;
+	write_opts.size_multiple = 2;
+	write_opts.max_commits = 0;
+	write_opts.expire_time = 0;
+	write_opts.max_new_filters = -1;
 
 	trace2_cmd_mode("write");
 
+	git_config(git_commit_graph_write_config, &opts);
+
 	argc = parse_options(argc, argv, NULL,
 			     builtin_commit_graph_write_options,
 			     builtin_commit_graph_write_usage, 0);
@@ -232,7 +269,7 @@
 	odb = find_odb(the_repository, opts.obj_dir);
 
 	if (opts.reachable) {
-		if (write_commit_graph_reachable(odb, flags, &split_opts))
+		if (write_commit_graph_reachable(odb, flags, &write_opts))
 			return 1;
 		return 0;
 	}
@@ -261,7 +298,7 @@
 			       opts.stdin_packs ? &pack_indexes : NULL,
 			       opts.stdin_commits ? &commits : NULL,
 			       flags,
-			       &split_opts))
+			       &write_opts))
 		result = 1;
 
 cleanup:
diff --git a/builtin/commit.c b/builtin/commit.c
index 5d91b13..42b964e 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1700,7 +1700,7 @@
 	git_test_write_commit_graph_or_die();
 
 	repo_rerere(the_repository, 0);
-	run_auto_gc(quiet);
+	run_auto_maintenance(quiet);
 	run_commit_hook(use_editor, get_index_file(), "post-commit", NULL);
 	if (amend && !no_post_rewrite) {
 		commit_post_rewrite(the_repository, current_head, &oid);
diff --git a/builtin/config.c b/builtin/config.c
index 53e411d..963d65f 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -65,6 +65,7 @@
 #define TYPE_PATH		4
 #define TYPE_EXPIRY_DATE	5
 #define TYPE_COLOR		6
+#define TYPE_BOOL_OR_STR	7
 
 #define OPT_CALLBACK_VALUE(s, l, v, h, i) \
 	{ OPTION_CALLBACK, (s), (l), (v), NULL, (h), PARSE_OPT_NOARG | \
@@ -94,6 +95,8 @@
 			new_type = TYPE_INT;
 		else if (!strcmp(arg, "bool-or-int"))
 			new_type = TYPE_BOOL_OR_INT;
+		else if (!strcmp(arg, "bool-or-str"))
+			new_type = TYPE_BOOL_OR_STR;
 		else if (!strcmp(arg, "path"))
 			new_type = TYPE_PATH;
 		else if (!strcmp(arg, "expiry-date"))
@@ -149,6 +152,7 @@
 	OPT_CALLBACK_VALUE(0, "bool", &type, N_("value is \"true\" or \"false\""), TYPE_BOOL),
 	OPT_CALLBACK_VALUE(0, "int", &type, N_("value is decimal number"), TYPE_INT),
 	OPT_CALLBACK_VALUE(0, "bool-or-int", &type, N_("value is --bool or --int"), TYPE_BOOL_OR_INT),
+	OPT_CALLBACK_VALUE(0, "bool-or-str", &type, N_("value is --bool or string"), TYPE_BOOL_OR_STR),
 	OPT_CALLBACK_VALUE(0, "path", &type, N_("value is a path (file or directory name)"), TYPE_PATH),
 	OPT_CALLBACK_VALUE(0, "expiry-date", &type, N_("value is an expiry date"), TYPE_EXPIRY_DATE),
 	OPT_GROUP(N_("Other")),
@@ -250,6 +254,12 @@
 				strbuf_addstr(buf, v ? "true" : "false");
 			else
 				strbuf_addf(buf, "%d", v);
+		} else if (type == TYPE_BOOL_OR_STR) {
+			int v = git_parse_maybe_bool(value_);
+			if (v < 0)
+				strbuf_addstr(buf, value_);
+			else
+				strbuf_addstr(buf, v ? "true" : "false");
 		} else if (type == TYPE_PATH) {
 			const char *v;
 			if (git_config_pathname(&v, key_, value_) < 0)
@@ -411,6 +421,13 @@
 		else
 			return xstrdup(v ? "true" : "false");
 	}
+	if (type == TYPE_BOOL_OR_STR) {
+		int v = git_parse_maybe_bool(value);
+		if (v < 0)
+			return xstrdup(value);
+		else
+			return xstrdup(v ? "true" : "false");
+	}
 	if (type == TYPE_COLOR) {
 		char v[COLOR_MAXLEN];
 		if (git_config_color(v, key, value))
diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 5527135..d2e33f5 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -405,12 +405,12 @@
 {
 	static uint32_t counter = 1; /* avoid null oid */
 	const unsigned hashsz = the_hash_algo->rawsz;
-	unsigned char out[GIT_MAX_RAWSZ];
+	struct object_id oid;
 	char *hex = xmallocz(GIT_MAX_HEXSZ);
 
-	hashclr(out);
-	put_be32(out + hashsz - 4, counter++);
-	return hash_to_hex_algop_r(hex, out, the_hash_algo);
+	oidclr(&oid);
+	put_be32(oid.hash + hashsz - 4, counter++);
+	return oid_to_hex_r(hex, &oid);
 }
 
 static const char *anonymize_oid(const char *oid_hex)
diff --git a/builtin/fetch.c b/builtin/fetch.c
index c555836..d5bf526 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -200,8 +200,10 @@
 	OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
 			N_("report that we have only objects reachable from this object")),
 	OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
+	OPT_BOOL(0, "auto-maintenance", &enable_auto_gc,
+		 N_("run 'maintenance --auto' after fetching")),
 	OPT_BOOL(0, "auto-gc", &enable_auto_gc,
-		 N_("run 'gc --auto' after fetching")),
+		 N_("run 'maintenance --auto' after fetching")),
 	OPT_BOOL(0, "show-forced-updates", &fetch_show_forced_updates,
 		 N_("check for forced-updates on all updated branches")),
 	OPT_BOOL(0, "write-commit-graph", &fetch_write_commit_graph,
@@ -966,8 +968,10 @@
 				ref->force = rm->peer_ref->force;
 			}
 
-			if (recurse_submodules != RECURSE_SUBMODULES_OFF)
+			if (recurse_submodules != RECURSE_SUBMODULES_OFF &&
+			    (!rm->peer_ref || !oideq(&ref->old_oid, &ref->new_oid))) {
 				check_for_new_submodule_commits(&rm->old_oid);
+			}
 
 			if (!strcmp(rm->name, "HEAD")) {
 				kind = "";
@@ -1550,7 +1554,10 @@
 		strvec_push(argv, "-v");
 	else if (verbosity < 0)
 		strvec_push(argv, "-q");
-
+	if (family == TRANSPORT_FAMILY_IPV4)
+		strvec_push(argv, "--ipv4");
+	else if (family == TRANSPORT_FAMILY_IPV6)
+		strvec_push(argv, "--ipv6");
 }
 
 /* Fetch multiple remotes in parallel */
@@ -1920,7 +1927,7 @@
 	close_object_store(the_repository->objects);
 
 	if (enable_auto_gc)
-		run_auto_gc(verbosity < 0);
+		run_auto_maintenance(verbosity < 0);
 
 	return result;
 }
diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index 57489e4..9d1ecda 100644
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -9,7 +9,7 @@
 static char const * const for_each_ref_usage[] = {
 	N_("git for-each-ref [<options>] [<pattern>]"),
 	N_("git for-each-ref [--points-at <object>]"),
-	N_("git for-each-ref [(--merged | --no-merged) [<commit>]]"),
+	N_("git for-each-ref [--merged [<commit>]] [--no-merged [<commit>]]"),
 	N_("git for-each-ref [--contains [<commit>]] [--no-contains [<commit>]]"),
 	NULL
 };
diff --git a/builtin/gc.c b/builtin/gc.c
index aafa094..0909593 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -28,6 +28,7 @@
 #include "blob.h"
 #include "tree.h"
 #include "promisor-remote.h"
+#include "refs.h"
 
 #define FAILED_RUN "failed to run %s"
 
@@ -699,3 +700,339 @@
 
 	return 0;
 }
+
+static const char * const builtin_maintenance_run_usage[] = {
+	N_("git maintenance run [--auto] [--[no-]quiet] [--task=<task>]"),
+	NULL
+};
+
+struct maintenance_run_opts {
+	int auto_flag;
+	int quiet;
+};
+
+/* Remember to update object flag allocation in object.h */
+#define SEEN		(1u<<0)
+
+struct cg_auto_data {
+	int num_not_in_graph;
+	int limit;
+};
+
+static int dfs_on_ref(const char *refname,
+		      const struct object_id *oid, int flags,
+		      void *cb_data)
+{
+	struct cg_auto_data *data = (struct cg_auto_data *)cb_data;
+	int result = 0;
+	struct object_id peeled;
+	struct commit_list *stack = NULL;
+	struct commit *commit;
+
+	if (!peel_ref(refname, &peeled))
+		oid = &peeled;
+	if (oid_object_info(the_repository, oid, NULL) != OBJ_COMMIT)
+		return 0;
+
+	commit = lookup_commit(the_repository, oid);
+	if (!commit)
+		return 0;
+	if (parse_commit(commit))
+		return 0;
+
+	commit_list_append(commit, &stack);
+
+	while (!result && stack) {
+		struct commit_list *parent;
+
+		commit = pop_commit(&stack);
+
+		for (parent = commit->parents; parent; parent = parent->next) {
+			if (parse_commit(parent->item) ||
+			    commit_graph_position(parent->item) != COMMIT_NOT_FROM_GRAPH ||
+			    parent->item->object.flags & SEEN)
+				continue;
+
+			parent->item->object.flags |= SEEN;
+			data->num_not_in_graph++;
+
+			if (data->num_not_in_graph >= data->limit) {
+				result = 1;
+				break;
+			}
+
+			commit_list_append(parent->item, &stack);
+		}
+	}
+
+	free_commit_list(stack);
+	return result;
+}
+
+static int should_write_commit_graph(void)
+{
+	int result;
+	struct cg_auto_data data;
+
+	data.num_not_in_graph = 0;
+	data.limit = 100;
+	git_config_get_int("maintenance.commit-graph.auto",
+			   &data.limit);
+
+	if (!data.limit)
+		return 0;
+	if (data.limit < 0)
+		return 1;
+
+	result = for_each_ref(dfs_on_ref, &data);
+
+	clear_commit_marks_all(SEEN);
+
+	return result;
+}
+
+static int run_write_commit_graph(struct maintenance_run_opts *opts)
+{
+	struct child_process child = CHILD_PROCESS_INIT;
+
+	child.git_cmd = 1;
+	strvec_pushl(&child.args, "commit-graph", "write",
+		     "--split", "--reachable", NULL);
+
+	if (opts->quiet)
+		strvec_push(&child.args, "--no-progress");
+
+	return !!run_command(&child);
+}
+
+static int maintenance_task_commit_graph(struct maintenance_run_opts *opts)
+{
+	close_object_store(the_repository->objects);
+	if (run_write_commit_graph(opts)) {
+		error(_("failed to write commit-graph"));
+		return 1;
+	}
+
+	return 0;
+}
+
+static int maintenance_task_gc(struct maintenance_run_opts *opts)
+{
+	struct child_process child = CHILD_PROCESS_INIT;
+
+	child.git_cmd = 1;
+	strvec_push(&child.args, "gc");
+
+	if (opts->auto_flag)
+		strvec_push(&child.args, "--auto");
+	if (opts->quiet)
+		strvec_push(&child.args, "--quiet");
+	else
+		strvec_push(&child.args, "--no-quiet");
+
+	close_object_store(the_repository->objects);
+	return run_command(&child);
+}
+
+typedef int maintenance_task_fn(struct maintenance_run_opts *opts);
+
+/*
+ * An auto condition function returns 1 if the task should run
+ * and 0 if the task should NOT run. See needs_to_gc() for an
+ * example.
+ */
+typedef int maintenance_auto_fn(void);
+
+struct maintenance_task {
+	const char *name;
+	maintenance_task_fn *fn;
+	maintenance_auto_fn *auto_condition;
+	unsigned enabled:1;
+
+	/* -1 if not selected. */
+	int selected_order;
+};
+
+enum maintenance_task_label {
+	TASK_GC,
+	TASK_COMMIT_GRAPH,
+
+	/* Leave as final value */
+	TASK__COUNT
+};
+
+static struct maintenance_task tasks[] = {
+	[TASK_GC] = {
+		"gc",
+		maintenance_task_gc,
+		need_to_gc,
+		1,
+	},
+	[TASK_COMMIT_GRAPH] = {
+		"commit-graph",
+		maintenance_task_commit_graph,
+		should_write_commit_graph,
+	},
+};
+
+static int compare_tasks_by_selection(const void *a_, const void *b_)
+{
+	const struct maintenance_task *a, *b;
+
+	a = (const struct maintenance_task *)&a_;
+	b = (const struct maintenance_task *)&b_;
+
+	return b->selected_order - a->selected_order;
+}
+
+static int maintenance_run_tasks(struct maintenance_run_opts *opts)
+{
+	int i, found_selected = 0;
+	int result = 0;
+	struct lock_file lk;
+	struct repository *r = the_repository;
+	char *lock_path = xstrfmt("%s/maintenance", r->objects->odb->path);
+
+	if (hold_lock_file_for_update(&lk, lock_path, LOCK_NO_DEREF) < 0) {
+		/*
+		 * Another maintenance command is running.
+		 *
+		 * If --auto was provided, then it is likely due to a
+		 * recursive process stack. Do not report an error in
+		 * that case.
+		 */
+		if (!opts->auto_flag && !opts->quiet)
+			warning(_("lock file '%s' exists, skipping maintenance"),
+				lock_path);
+		free(lock_path);
+		return 0;
+	}
+	free(lock_path);
+
+	for (i = 0; !found_selected && i < TASK__COUNT; i++)
+		found_selected = tasks[i].selected_order >= 0;
+
+	if (found_selected)
+		QSORT(tasks, TASK__COUNT, compare_tasks_by_selection);
+
+	for (i = 0; i < TASK__COUNT; i++) {
+		if (found_selected && tasks[i].selected_order < 0)
+			continue;
+
+		if (!found_selected && !tasks[i].enabled)
+			continue;
+
+		if (opts->auto_flag &&
+		    (!tasks[i].auto_condition ||
+		     !tasks[i].auto_condition()))
+			continue;
+
+		trace2_region_enter("maintenance", tasks[i].name, r);
+		if (tasks[i].fn(opts)) {
+			error(_("task '%s' failed"), tasks[i].name);
+			result = 1;
+		}
+		trace2_region_leave("maintenance", tasks[i].name, r);
+	}
+
+	rollback_lock_file(&lk);
+	return result;
+}
+
+static void initialize_task_config(void)
+{
+	int i;
+	struct strbuf config_name = STRBUF_INIT;
+	gc_config();
+
+	for (i = 0; i < TASK__COUNT; i++) {
+		int config_value;
+
+		strbuf_setlen(&config_name, 0);
+		strbuf_addf(&config_name, "maintenance.%s.enabled",
+			    tasks[i].name);
+
+		if (!git_config_get_bool(config_name.buf, &config_value))
+			tasks[i].enabled = config_value;
+	}
+
+	strbuf_release(&config_name);
+}
+
+static int task_option_parse(const struct option *opt,
+			     const char *arg, int unset)
+{
+	int i, num_selected = 0;
+	struct maintenance_task *task = NULL;
+
+	BUG_ON_OPT_NEG(unset);
+
+	for (i = 0; i < TASK__COUNT; i++) {
+		if (tasks[i].selected_order >= 0)
+			num_selected++;
+		if (!strcasecmp(tasks[i].name, arg)) {
+			task = &tasks[i];
+		}
+	}
+
+	if (!task) {
+		error(_("'%s' is not a valid task"), arg);
+		return 1;
+	}
+
+	if (task->selected_order >= 0) {
+		error(_("task '%s' cannot be selected multiple times"), arg);
+		return 1;
+	}
+
+	task->selected_order = num_selected + 1;
+
+	return 0;
+}
+
+static int maintenance_run(int argc, const char **argv, const char *prefix)
+{
+	int i;
+	struct maintenance_run_opts opts;
+	struct option builtin_maintenance_run_options[] = {
+		OPT_BOOL(0, "auto", &opts.auto_flag,
+			 N_("run tasks based on the state of the repository")),
+		OPT_BOOL(0, "quiet", &opts.quiet,
+			 N_("do not report progress or other information over stderr")),
+		OPT_CALLBACK_F(0, "task", NULL, N_("task"),
+			N_("run a specific task"),
+			PARSE_OPT_NONEG, task_option_parse),
+		OPT_END()
+	};
+	memset(&opts, 0, sizeof(opts));
+
+	opts.quiet = !isatty(2);
+	initialize_task_config();
+
+	for (i = 0; i < TASK__COUNT; i++)
+		tasks[i].selected_order = -1;
+
+	argc = parse_options(argc, argv, prefix,
+			     builtin_maintenance_run_options,
+			     builtin_maintenance_run_usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION);
+
+	if (argc != 0)
+		usage_with_options(builtin_maintenance_run_usage,
+				   builtin_maintenance_run_options);
+	return maintenance_run_tasks(&opts);
+}
+
+static const char builtin_maintenance_usage[] = N_("git maintenance run [<options>]");
+
+int cmd_maintenance(int argc, const char **argv, const char *prefix)
+{
+	if (argc < 2 ||
+	    (argc == 2 && !strcmp(argv[1], "-h")))
+		usage(builtin_maintenance_usage);
+
+	if (!strcmp(argv[1], "run"))
+		return maintenance_run(argc - 1, argv + 1, prefix);
+
+	die(_("invalid subcommand: %s"), argv[1]);
+}
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 9721bf1..8acd078 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -33,19 +33,61 @@
 };
 
 struct base_data {
+	/* Initialized by make_base(). */
 	struct base_data *base;
-	struct base_data *child;
 	struct object_entry *obj;
-	void *data;
-	unsigned long size;
 	int ref_first, ref_last;
 	int ofs_first, ofs_last;
+	/*
+	 * Threads should increment retain_data if they are about to call
+	 * patch_delta() using this struct's data as a base, and decrement this
+	 * when they are done. While retain_data is nonzero, this struct's data
+	 * will not be freed even if the delta base cache limit is exceeded.
+	 */
+	int retain_data;
+	/*
+	 * The number of direct children that have not been fully processed
+	 * (entered work_head, entered done_head, left done_head). When this
+	 * number reaches zero, this struct base_data can be freed.
+	 */
+	int children_remaining;
+
+	/* Not initialized by make_base(). */
+	struct list_head list;
+	void *data;
+	unsigned long size;
 };
 
+/*
+ * Stack of struct base_data that have unprocessed children.
+ * threaded_second_pass() uses this as a source of work (the other being the
+ * objects array).
+ *
+ * Guarded by work_mutex.
+ */
+static LIST_HEAD(work_head);
+
+/*
+ * Stack of struct base_data that have children, all of whom have been
+ * processed or are being processed, and at least one child is being processed.
+ * These struct base_data must be kept around until the last child is
+ * processed.
+ *
+ * Guarded by work_mutex.
+ */
+static LIST_HEAD(done_head);
+
+/*
+ * All threads share one delta base cache.
+ *
+ * base_cache_used is guarded by work_mutex, and base_cache_limit is read-only
+ * in a thread.
+ */
+static size_t base_cache_used;
+static size_t base_cache_limit;
+
 struct thread_local {
 	pthread_t thread;
-	struct base_data *base_cache;
-	size_t base_cache_used;
 	int pack_fd;
 };
 
@@ -364,56 +406,42 @@
 		pthread_setspecific(key, data);
 }
 
-static struct base_data *alloc_base_data(void)
-{
-	struct base_data *base = xcalloc(1, sizeof(struct base_data));
-	base->ref_last = -1;
-	base->ofs_last = -1;
-	return base;
-}
-
 static void free_base_data(struct base_data *c)
 {
 	if (c->data) {
 		FREE_AND_NULL(c->data);
-		get_thread_data()->base_cache_used -= c->size;
+		base_cache_used -= c->size;
 	}
 }
 
 static void prune_base_data(struct base_data *retain)
 {
-	struct base_data *b;
-	struct thread_local *data = get_thread_data();
-	for (b = data->base_cache;
-	     data->base_cache_used > delta_base_cache_limit && b;
-	     b = b->child) {
-		if (b->data && b != retain)
+	struct list_head *pos;
+
+	if (base_cache_used <= base_cache_limit)
+		return;
+
+	list_for_each_prev(pos, &done_head) {
+		struct base_data *b = list_entry(pos, struct base_data, list);
+		if (b->retain_data || b == retain)
+			continue;
+		if (b->data) {
 			free_base_data(b);
+			if (base_cache_used <= base_cache_limit)
+				return;
+		}
 	}
-}
 
-static void link_base_data(struct base_data *base, struct base_data *c)
-{
-	if (base)
-		base->child = c;
-	else
-		get_thread_data()->base_cache = c;
-
-	c->base = base;
-	c->child = NULL;
-	if (c->data)
-		get_thread_data()->base_cache_used += c->size;
-	prune_base_data(c);
-}
-
-static void unlink_base_data(struct base_data *c)
-{
-	struct base_data *base = c->base;
-	if (base)
-		base->child = NULL;
-	else
-		get_thread_data()->base_cache = NULL;
-	free_base_data(c);
+	list_for_each_prev(pos, &work_head) {
+		struct base_data *b = list_entry(pos, struct base_data, list);
+		if (b->retain_data || b == retain)
+			continue;
+		if (b->data) {
+			free_base_data(b);
+			if (base_cache_used <= base_cache_limit)
+				return;
+		}
+	}
 }
 
 static int is_delta_type(enum object_type type)
@@ -614,7 +642,7 @@
 	       0;
 }
 
-static int find_ofs_delta(const off_t offset, enum object_type type)
+static int find_ofs_delta(const off_t offset)
 {
 	int first = 0, last = nr_ofs_deltas;
 
@@ -624,7 +652,8 @@
 		int cmp;
 
 		cmp = compare_ofs_delta_bases(offset, delta->offset,
-					      type, objects[delta->obj_no].type);
+					      OBJ_OFS_DELTA,
+					      objects[delta->obj_no].type);
 		if (!cmp)
 			return next;
 		if (cmp < 0) {
@@ -637,10 +666,9 @@
 }
 
 static void find_ofs_delta_children(off_t offset,
-				    int *first_index, int *last_index,
-				    enum object_type type)
+				    int *first_index, int *last_index)
 {
-	int first = find_ofs_delta(offset, type);
+	int first = find_ofs_delta(offset);
 	int last = first;
 	int end = nr_ofs_deltas - 1;
 
@@ -668,7 +696,7 @@
 	return oidcmp(oid1, oid2);
 }
 
-static int find_ref_delta(const struct object_id *oid, enum object_type type)
+static int find_ref_delta(const struct object_id *oid)
 {
 	int first = 0, last = nr_ref_deltas;
 
@@ -678,7 +706,8 @@
 		int cmp;
 
 		cmp = compare_ref_delta_bases(oid, &delta->oid,
-					      type, objects[delta->obj_no].type);
+					      OBJ_REF_DELTA,
+					      objects[delta->obj_no].type);
 		if (!cmp)
 			return next;
 		if (cmp < 0) {
@@ -691,10 +720,9 @@
 }
 
 static void find_ref_delta_children(const struct object_id *oid,
-				    int *first_index, int *last_index,
-				    enum object_type type)
+				    int *first_index, int *last_index)
 {
-	int first = find_ref_delta(oid, type);
+	int first = find_ref_delta(oid);
 	int last = first;
 	int end = nr_ref_deltas - 1;
 
@@ -866,15 +894,7 @@
 }
 
 /*
- * This function is part of find_unresolved_deltas(). There are two
- * walkers going in the opposite ways.
- *
- * The first one in find_unresolved_deltas() traverses down from
- * parent node to children, deflating nodes along the way. However,
- * memory for deflated nodes is limited by delta_base_cache_limit, so
- * at some point parent node's deflated content may be freed.
- *
- * The second walker is this function, which goes from current node up
+ * Walk from current node up
  * to top parent if necessary to deflate the node. In normal
  * situation, its parent node would be already deflated, so it just
  * needs to apply delta.
@@ -902,7 +922,7 @@
 		if (!delta_nr) {
 			c->data = get_data_from_pack(obj);
 			c->size = obj->size;
-			get_thread_data()->base_cache_used += c->size;
+			base_cache_used += c->size;
 			prune_base_data(c);
 		}
 		for (; delta_nr > 0; delta_nr--) {
@@ -918,7 +938,7 @@
 			free(raw);
 			if (!c->data)
 				bad_object(obj->idx.offset, _("failed to apply delta"));
-			get_thread_data()->base_cache_used += c->size;
+			base_cache_used += c->size;
 			prune_base_data(c);
 		}
 		free(delta);
@@ -926,10 +946,27 @@
 	return c->data;
 }
 
-static void resolve_delta(struct object_entry *delta_obj,
-			  struct base_data *base, struct base_data *result)
+static struct base_data *make_base(struct object_entry *obj,
+				   struct base_data *parent)
 {
-	void *base_data, *delta_data;
+	struct base_data *base = xcalloc(1, sizeof(struct base_data));
+	base->base = parent;
+	base->obj = obj;
+	find_ref_delta_children(&obj->idx.oid,
+				&base->ref_first, &base->ref_last);
+	find_ofs_delta_children(obj->idx.offset,
+				&base->ofs_first, &base->ofs_last);
+	base->children_remaining = base->ref_last - base->ref_first +
+		base->ofs_last - base->ofs_first + 2;
+	return base;
+}
+
+static struct base_data *resolve_delta(struct object_entry *delta_obj,
+				       struct base_data *base)
+{
+	void *delta_data, *result_data;
+	struct base_data *result;
+	unsigned long result_size;
 
 	if (show_stat) {
 		int i = delta_obj - objects;
@@ -942,115 +979,26 @@
 		obj_stat[i].base_object_no = j;
 	}
 	delta_data = get_data_from_pack(delta_obj);
-	base_data = get_base_data(base);
-	result->obj = delta_obj;
-	result->data = patch_delta(base_data, base->size,
-				   delta_data, delta_obj->size, &result->size);
+	assert(base->data);
+	result_data = patch_delta(base->data, base->size,
+				  delta_data, delta_obj->size, &result_size);
 	free(delta_data);
-	if (!result->data)
+	if (!result_data)
 		bad_object(delta_obj->idx.offset, _("failed to apply delta"));
-	hash_object_file(the_hash_algo, result->data, result->size,
+	hash_object_file(the_hash_algo, result_data, result_size,
 			 type_name(delta_obj->real_type), &delta_obj->idx.oid);
-	sha1_object(result->data, NULL, result->size, delta_obj->real_type,
+	sha1_object(result_data, NULL, result_size, delta_obj->real_type,
 		    &delta_obj->idx.oid);
+
+	result = make_base(delta_obj, base);
+	result->data = result_data;
+	result->size = result_size;
+
 	counter_lock();
 	nr_resolved_deltas++;
 	counter_unlock();
-}
 
-/*
- * Standard boolean compare-and-swap: atomically check whether "*type" is
- * "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
- * and return false.
- */
-static int compare_and_swap_type(signed char *type,
-				 enum object_type want,
-				 enum object_type set)
-{
-	enum object_type old;
-
-	type_cas_lock();
-	old = *type;
-	if (old == want)
-		*type = set;
-	type_cas_unlock();
-
-	return old == want;
-}
-
-static struct base_data *find_unresolved_deltas_1(struct base_data *base,
-						  struct base_data *prev_base)
-{
-	if (base->ref_last == -1 && base->ofs_last == -1) {
-		find_ref_delta_children(&base->obj->idx.oid,
-					&base->ref_first, &base->ref_last,
-					OBJ_REF_DELTA);
-
-		find_ofs_delta_children(base->obj->idx.offset,
-					&base->ofs_first, &base->ofs_last,
-					OBJ_OFS_DELTA);
-
-		if (base->ref_last == -1 && base->ofs_last == -1) {
-			free(base->data);
-			return NULL;
-		}
-
-		link_base_data(prev_base, base);
-	}
-
-	if (base->ref_first <= base->ref_last) {
-		struct object_entry *child = objects + ref_deltas[base->ref_first].obj_no;
-		struct base_data *result = alloc_base_data();
-
-		if (!compare_and_swap_type(&child->real_type, OBJ_REF_DELTA,
-					   base->obj->real_type))
-			die("REF_DELTA at offset %"PRIuMAX" already resolved (duplicate base %s?)",
-			    (uintmax_t)child->idx.offset,
-			    oid_to_hex(&base->obj->idx.oid));
-
-		resolve_delta(child, base, result);
-		if (base->ref_first == base->ref_last && base->ofs_last == -1)
-			free_base_data(base);
-
-		base->ref_first++;
-		return result;
-	}
-
-	if (base->ofs_first <= base->ofs_last) {
-		struct object_entry *child = objects + ofs_deltas[base->ofs_first].obj_no;
-		struct base_data *result = alloc_base_data();
-
-		assert(child->real_type == OBJ_OFS_DELTA);
-		child->real_type = base->obj->real_type;
-		resolve_delta(child, base, result);
-		if (base->ofs_first == base->ofs_last)
-			free_base_data(base);
-
-		base->ofs_first++;
-		return result;
-	}
-
-	unlink_base_data(base);
-	return NULL;
-}
-
-static void find_unresolved_deltas(struct base_data *base)
-{
-	struct base_data *new_base, *prev_base = NULL;
-	for (;;) {
-		new_base = find_unresolved_deltas_1(base, prev_base);
-
-		if (new_base) {
-			prev_base = base;
-			base = new_base;
-		} else {
-			free(base);
-			base = prev_base;
-			if (!base)
-				return;
-			prev_base = base->base;
-		}
-	}
+	return result;
 }
 
 static int compare_ofs_delta_entry(const void *a, const void *b)
@@ -1071,34 +1019,131 @@
 	return oidcmp(&delta_a->oid, &delta_b->oid);
 }
 
-static void resolve_base(struct object_entry *obj)
-{
-	struct base_data *base_obj = alloc_base_data();
-	base_obj->obj = obj;
-	base_obj->data = NULL;
-	find_unresolved_deltas(base_obj);
-}
-
 static void *threaded_second_pass(void *data)
 {
-	set_thread_data(data);
+	if (data)
+		set_thread_data(data);
 	for (;;) {
-		int i;
-		counter_lock();
-		display_progress(progress, nr_resolved_deltas);
-		counter_unlock();
+		struct base_data *parent = NULL;
+		struct object_entry *child_obj;
+		struct base_data *child;
+
 		work_lock();
-		while (nr_dispatched < nr_objects &&
-		       is_delta_type(objects[nr_dispatched].type))
-			nr_dispatched++;
-		if (nr_dispatched >= nr_objects) {
-			work_unlock();
-			break;
+		if (list_empty(&work_head)) {
+			/*
+			 * Take an object from the object array.
+			 */
+			while (nr_dispatched < nr_objects &&
+			       is_delta_type(objects[nr_dispatched].type))
+				nr_dispatched++;
+			if (nr_dispatched >= nr_objects) {
+				work_unlock();
+				break;
+			}
+			child_obj = &objects[nr_dispatched++];
+		} else {
+			/*
+			 * Peek at the top of the stack, and take a child from
+			 * it.
+			 */
+			parent = list_first_entry(&work_head, struct base_data,
+						  list);
+
+			if (parent->ref_first <= parent->ref_last) {
+				int offset = ref_deltas[parent->ref_first++].obj_no;
+				child_obj = objects + offset;
+				if (child_obj->real_type != OBJ_REF_DELTA)
+					die("REF_DELTA at offset %"PRIuMAX" already resolved (duplicate base %s?)",
+					    (uintmax_t) child_obj->idx.offset,
+					    oid_to_hex(&parent->obj->idx.oid));
+				child_obj->real_type = parent->obj->real_type;
+			} else {
+				child_obj = objects +
+					ofs_deltas[parent->ofs_first++].obj_no;
+				assert(child_obj->real_type == OBJ_OFS_DELTA);
+				child_obj->real_type = parent->obj->real_type;
+			}
+
+			if (parent->ref_first > parent->ref_last &&
+			    parent->ofs_first > parent->ofs_last) {
+				/*
+				 * This parent has run out of children, so move
+				 * it to done_head.
+				 */
+				list_del(&parent->list);
+				list_add(&parent->list, &done_head);
+			}
+
+			/*
+			 * Ensure that the parent has data, since we will need
+			 * it later.
+			 *
+			 * NEEDSWORK: If parent data needs to be reloaded, this
+			 * prolongs the time that the current thread spends in
+			 * the mutex. A mitigating factor is that parent data
+			 * needs to be reloaded only if the delta base cache
+			 * limit is exceeded, so in the typical case, this does
+			 * not happen.
+			 */
+			get_base_data(parent);
+			parent->retain_data++;
 		}
-		i = nr_dispatched++;
 		work_unlock();
 
-		resolve_base(&objects[i]);
+		if (parent) {
+			child = resolve_delta(child_obj, parent);
+			if (!child->children_remaining)
+				FREE_AND_NULL(child->data);
+		} else {
+			child = make_base(child_obj, NULL);
+			if (child->children_remaining) {
+				/*
+				 * Since this child has its own delta children,
+				 * we will need this data in the future.
+				 * Inflate now so that future iterations will
+				 * have access to this object's data while
+				 * outside the work mutex.
+				 */
+				child->data = get_data_from_pack(child_obj);
+				child->size = child_obj->size;
+			}
+		}
+
+		work_lock();
+		if (parent)
+			parent->retain_data--;
+		if (child->data) {
+			/*
+			 * This child has its own children, so add it to
+			 * work_head.
+			 */
+			list_add(&child->list, &work_head);
+			base_cache_used += child->size;
+			prune_base_data(NULL);
+		} else {
+			/*
+			 * This child does not have its own children. It may be
+			 * the last descendant of its ancestors; free those
+			 * that we can.
+			 */
+			struct base_data *p = parent;
+
+			while (p) {
+				struct base_data *next_p;
+
+				p->children_remaining--;
+				if (p->children_remaining)
+					break;
+
+				next_p = p->base;
+				free_base_data(p);
+				list_del(&p->list);
+				free(p);
+
+				p = next_p;
+			}
+		}
+		work_unlock();
 	}
 	return NULL;
 }
@@ -1199,6 +1244,7 @@
 					  nr_ref_deltas + nr_ofs_deltas);
 
 	nr_dispatched = 0;
+	base_cache_limit = delta_base_cache_limit * nr_threads;
 	if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
 		init_thread();
 		for (i = 0; i < nr_threads; i++) {
@@ -1213,15 +1259,7 @@
 		cleanup_thread();
 		return;
 	}
-
-	for (i = 0; i < nr_objects; i++) {
-		struct object_entry *obj = &objects[i];
-
-		if (is_delta_type(obj->type))
-			continue;
-		resolve_base(obj);
-		display_progress(progress, nr_resolved_deltas);
-	}
+	threaded_second_pass(&nothread_data);
 }
 
 /*
@@ -1376,22 +1414,28 @@
 	for (i = 0; i < nr_ref_deltas; i++) {
 		struct ref_delta_entry *d = sorted_by_pos[i];
 		enum object_type type;
-		struct base_data *base_obj = alloc_base_data();
+		void *data;
+		unsigned long size;
 
 		if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
 			continue;
-		base_obj->data = read_object_file(&d->oid, &type,
-						  &base_obj->size);
-		if (!base_obj->data)
+		data = read_object_file(&d->oid, &type, &size);
+		if (!data)
 			continue;
 
 		if (check_object_signature(the_repository, &d->oid,
-					   base_obj->data, base_obj->size,
+					   data, size,
 					   type_name(type)))
 			die(_("local object %s is corrupt"), oid_to_hex(&d->oid));
-		base_obj->obj = append_obj_to_pack(f, d->oid.hash,
-					base_obj->data, base_obj->size, type);
-		find_unresolved_deltas(base_obj);
+
+		/*
+		 * Add this as an object to the objects array and call
+		 * threaded_second_pass() (which will pick up the added
+		 * object).
+		 */
+		append_obj_to_pack(f, d->oid.hash, data, size, type);
+		threaded_second_pass(NULL);
+
 		display_progress(progress, nr_resolved_deltas);
 	}
 	free(sorted_by_pos);
diff --git a/builtin/init-db.c b/builtin/init-db.c
index cd3e760..01bc648 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -179,7 +179,7 @@
 	return 1;
 }
 
-void initialize_repository_version(int hash_algo)
+void initialize_repository_version(int hash_algo, int reinit)
 {
 	char repo_version_string[10];
 	int repo_version = GIT_REPO_VERSION;
@@ -195,6 +195,8 @@
 	if (hash_algo != GIT_HASH_SHA1)
 		git_config_set("extensions.objectformat",
 			       hash_algos[hash_algo].name);
+	else if (reinit)
+		git_config_set_gently("extensions.objectformat", NULL);
 }
 
 static int create_default_files(const char *template_path,
@@ -277,7 +279,7 @@
 		free(ref);
 	}
 
-	initialize_repository_version(fmt->hash_algo);
+	initialize_repository_version(fmt->hash_algo, 0);
 
 	/* Check filemode trustability */
 	path = git_path_buf(&buf, "config");
diff --git a/builtin/log.c b/builtin/log.c
index 4ec7f57..7f27e9e 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -33,7 +33,6 @@
 #include "commit-slab.h"
 #include "repository.h"
 #include "commit-reach.h"
-#include "interdiff.h"
 #include "range-diff.h"
 
 #define MAIL_DEFAULT_WRAP 72
@@ -1196,6 +1195,7 @@
 	log.in1 = 2;
 	log.in2 = 4;
 	log.file = rev->diffopt.file;
+	log.groups = SHORTLOG_GROUP_AUTHOR;
 	for (i = 0; i < nr; i++)
 		shortlog_add_commit(&log, list[i]);
 
@@ -1207,7 +1207,8 @@
 
 	if (rev->idiff_oid1) {
 		fprintf_ln(rev->diffopt.file, "%s", rev->idiff_title);
-		show_interdiff(rev, 0);
+		show_interdiff(rev->idiff_oid1, rev->idiff_oid2, 0,
+			       &rev->diffopt);
 	}
 
 	if (rev->rdiff1) {
@@ -1595,16 +1596,20 @@
 				    struct commit *head)
 {
 	const char *head_oid = oid_to_hex(&head->object.oid);
+	int prev_is_range = !!strstr(prev, "..");
 
-	if (!strstr(prev, "..")) {
-		strbuf_addf(r1, "%s..%s", head_oid, prev);
-		strbuf_addf(r2, "%s..%s", prev, head_oid);
-	} else if (!origin) {
-		die(_("failed to infer range-diff ranges"));
-	} else {
+	if (prev_is_range)
 		strbuf_addstr(r1, prev);
-		strbuf_addf(r2, "%s..%s",
-			    oid_to_hex(&origin->object.oid), head_oid);
+	else
+		strbuf_addf(r1, "%s..%s", head_oid, prev);
+
+	if (origin)
+		strbuf_addf(r2, "%s..%s", oid_to_hex(&origin->object.oid), head_oid);
+	else if (prev_is_range)
+		die(_("failed to infer range-diff origin of current series"));
+	else {
+		warning(_("using '%s' as range-diff origin of current series"), prev);
+		strbuf_addf(r2, "%s..%s", prev, head_oid);
 	}
 }
 
diff --git a/builtin/merge.c b/builtin/merge.c
index 032a8f5..9d5359e 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -456,7 +456,7 @@
 			 * user should see them.
 			 */
 			close_object_store(the_repository->objects);
-			run_auto_gc(verbosity < 0);
+			run_auto_maintenance(verbosity < 0);
 		}
 	}
 	if (new_head && show_diffstat) {
diff --git a/builtin/pull.c b/builtin/pull.c
index 015f6de..425950f 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -344,8 +344,7 @@
 	if (!git_config_get_value("pull.rebase", &value))
 		return parse_config_rebase("pull.rebase", value, 1);
 
-	if (opt_verbosity >= 0 &&
-	    (!opt_ff || strcmp(opt_ff, "--ff-only"))) {
+	if (opt_verbosity >= 0 && !opt_ff) {
 		warning(_("Pulling without specifying how to reconcile divergent branches is\n"
 			"discouraged. You can squelch this message by running one of the following\n"
 			"commands sometime before your next pull:\n"
diff --git a/builtin/rebase.c b/builtin/rebase.c
index c4ff203..eeca533 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -734,10 +734,10 @@
 	apply_autostash(state_dir_path("autostash", opts));
 	close_object_store(the_repository->objects);
 	/*
-	 * We ignore errors in 'gc --auto', since the
+	 * We ignore errors in 'git maintenance run --auto', since the
 	 * user should see them.
 	 */
-	run_auto_gc(!(opts->flags & (REBASE_NO_QUIET|REBASE_VERBOSE)));
+	run_auto_maintenance(!(opts->flags & (REBASE_NO_QUIET|REBASE_VERBOSE)));
 	if (opts->type == REBASE_MERGE) {
 		struct replay_opts replay = REPLAY_OPTS_INIT;
 
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 439f29d..bb9909c 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -57,6 +57,7 @@
 static int unpack_limit = 100;
 static off_t max_input_size;
 static int report_status;
+static int report_status_v2;
 static int use_sideband;
 static int use_atomic;
 static int use_push_options;
@@ -97,6 +98,17 @@
 
 static struct tmp_objdir *tmp_objdir;
 
+static struct proc_receive_ref {
+	unsigned int want_add:1,
+		     want_delete:1,
+		     want_modify:1,
+		     negative_ref:1;
+	char *ref_prefix;
+	struct proc_receive_ref *next;
+} *proc_receive_ref;
+
+static void proc_receive_ref_append(const char *prefix);
+
 static enum deny_action parse_deny_action(const char *var, const char *value)
 {
 	if (value) {
@@ -229,6 +241,13 @@
 		return 0;
 	}
 
+	if (strcmp(var, "receive.procreceiverefs") == 0) {
+		if (!value)
+			return config_error_nonbool(var);
+		proc_receive_ref_append(value);
+		return 0;
+	}
+
 	return git_default_config(var, value, cb);
 }
 
@@ -240,7 +259,7 @@
 		struct strbuf cap = STRBUF_INIT;
 
 		strbuf_addstr(&cap,
-			      "report-status delete-refs side-band-64k quiet");
+			      "report-status report-status-v2 delete-refs side-band-64k quiet");
 		if (advertise_atomic_push)
 			strbuf_addstr(&cap, " atomic");
 		if (prefer_ofs_delta)
@@ -310,17 +329,94 @@
 	packet_flush(1);
 }
 
+#define RUN_PROC_RECEIVE_SCHEDULED	1
+#define RUN_PROC_RECEIVE_RETURNED	2
 struct command {
 	struct command *next;
 	const char *error_string;
+	struct ref_push_report *report;
 	unsigned int skip_update:1,
-		     did_not_exist:1;
+		     did_not_exist:1,
+		     run_proc_receive:2;
 	int index;
 	struct object_id old_oid;
 	struct object_id new_oid;
 	char ref_name[FLEX_ARRAY]; /* more */
 };
 
+static void proc_receive_ref_append(const char *prefix)
+{
+	struct proc_receive_ref *ref_pattern;
+	char *p;
+	int len;
+
+	ref_pattern = xcalloc(1, sizeof(struct proc_receive_ref));
+	p = strchr(prefix, ':');
+	if (p) {
+		while (prefix < p) {
+			if (*prefix == 'a')
+				ref_pattern->want_add = 1;
+			else if (*prefix == 'd')
+				ref_pattern->want_delete = 1;
+			else if (*prefix == 'm')
+				ref_pattern->want_modify = 1;
+			else if (*prefix == '!')
+				ref_pattern->negative_ref = 1;
+			prefix++;
+		}
+		prefix++;
+	} else {
+		ref_pattern->want_add = 1;
+		ref_pattern->want_delete = 1;
+		ref_pattern->want_modify = 1;
+	}
+	len = strlen(prefix);
+	while (len && prefix[len - 1] == '/')
+		len--;
+	ref_pattern->ref_prefix = xmemdupz(prefix, len);
+	if (!proc_receive_ref) {
+		proc_receive_ref = ref_pattern;
+	} else {
+		struct proc_receive_ref *end;
+
+		end = proc_receive_ref;
+		while (end->next)
+			end = end->next;
+		end->next = ref_pattern;
+	}
+}
+
+static int proc_receive_ref_matches(struct command *cmd)
+{
+	struct proc_receive_ref *p;
+
+	if (!proc_receive_ref)
+		return 0;
+
+	for (p = proc_receive_ref; p; p = p->next) {
+		const char *match = p->ref_prefix;
+		const char *remains;
+
+		if (!p->want_add && is_null_oid(&cmd->old_oid))
+			continue;
+		else if (!p->want_delete && is_null_oid(&cmd->new_oid))
+			continue;
+		else if (!p->want_modify &&
+			 !is_null_oid(&cmd->old_oid) &&
+			 !is_null_oid(&cmd->new_oid))
+			continue;
+
+		if (skip_prefix(cmd->ref_name, match, &remains) &&
+		    (!*remains || *remains == '/')) {
+			if (!p->negative_ref)
+				return 1;
+		} else if (p->negative_ref) {
+			return 1;
+		}
+	}
+	return 0;
+}
+
 static void rp_error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 static void rp_warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 
@@ -692,6 +788,7 @@
 
 struct receive_hook_feed_state {
 	struct command *cmd;
+	struct ref_push_report *report;
 	int skip_broken;
 	struct strbuf buf;
 	const struct string_list *push_options;
@@ -779,11 +876,31 @@
 		cmd = cmd->next;
 	if (!cmd)
 		return -1; /* EOF */
+	if (!bufp)
+		return 0; /* OK, can feed something. */
 	strbuf_reset(&state->buf);
-	strbuf_addf(&state->buf, "%s %s %s\n",
-		    oid_to_hex(&cmd->old_oid), oid_to_hex(&cmd->new_oid),
-		    cmd->ref_name);
-	state->cmd = cmd->next;
+	if (!state->report)
+		state->report = cmd->report;
+	if (state->report) {
+		struct object_id *old_oid;
+		struct object_id *new_oid;
+		const char *ref_name;
+
+		old_oid = state->report->old_oid ? state->report->old_oid : &cmd->old_oid;
+		new_oid = state->report->new_oid ? state->report->new_oid : &cmd->new_oid;
+		ref_name = state->report->ref_name ? state->report->ref_name : cmd->ref_name;
+		strbuf_addf(&state->buf, "%s %s %s\n",
+			    oid_to_hex(old_oid), oid_to_hex(new_oid),
+			    ref_name);
+		state->report = state->report->next;
+		if (!state->report)
+			state->cmd = cmd->next;
+	} else {
+		strbuf_addf(&state->buf, "%s %s %s\n",
+			    oid_to_hex(&cmd->old_oid), oid_to_hex(&cmd->new_oid),
+			    cmd->ref_name);
+		state->cmd = cmd->next;
+	}
 	if (bufp) {
 		*bufp = state->buf.buf;
 		*sizep = state->buf.len;
@@ -802,6 +919,7 @@
 	strbuf_init(&state.buf, 0);
 	state.cmd = commands;
 	state.skip_broken = skip_broken;
+	state.report = NULL;
 	if (feed_receive_hook(&state, NULL, NULL))
 		return 0;
 	state.cmd = commands;
@@ -840,6 +958,268 @@
 	return finish_command(&proc);
 }
 
+static struct command *find_command_by_refname(struct command *list,
+					       const char *refname)
+{
+	for (; list; list = list->next)
+		if (!strcmp(list->ref_name, refname))
+			return list;
+	return NULL;
+}
+
+static int read_proc_receive_report(struct packet_reader *reader,
+				    struct command *commands,
+				    struct strbuf *errmsg)
+{
+	struct command *cmd;
+	struct command *hint = NULL;
+	struct ref_push_report *report = NULL;
+	int new_report = 0;
+	int code = 0;
+	int once = 0;
+
+	for (;;) {
+		struct object_id old_oid, new_oid;
+		const char *head;
+		const char *refname;
+		char *p;
+
+		if (packet_reader_read(reader) != PACKET_READ_NORMAL)
+			break;
+
+		head = reader->line;
+		p = strchr(head, ' ');
+		if (!p) {
+			strbuf_addf(errmsg, "proc-receive reported incomplete status line: '%s'\n", head);
+			code = -1;
+			continue;
+		}
+		*p++ = '\0';
+		if (!strcmp(head, "option")) {
+			const char *key, *val;
+
+			if (!hint || !(report || new_report)) {
+				if (!once++)
+					strbuf_addstr(errmsg, "proc-receive reported 'option' without a matching 'ok/ng' directive\n");
+				code = -1;
+				continue;
+			}
+			if (new_report) {
+				if (!hint->report) {
+					hint->report = xcalloc(1, sizeof(struct ref_push_report));
+					report = hint->report;
+				} else {
+					report = hint->report;
+					while (report->next)
+						report = report->next;
+					report->next = xcalloc(1, sizeof(struct ref_push_report));
+					report = report->next;
+				}
+				new_report = 0;
+			}
+			key = p;
+			p = strchr(key, ' ');
+			if (p)
+				*p++ = '\0';
+			val = p;
+			if (!strcmp(key, "refname"))
+				report->ref_name = xstrdup_or_null(val);
+			else if (!strcmp(key, "old-oid") && val &&
+				 !parse_oid_hex(val, &old_oid, &val))
+				report->old_oid = oiddup(&old_oid);
+			else if (!strcmp(key, "new-oid") && val &&
+				 !parse_oid_hex(val, &new_oid, &val))
+				report->new_oid = oiddup(&new_oid);
+			else if (!strcmp(key, "forced-update"))
+				report->forced_update = 1;
+			else if (!strcmp(key, "fall-through"))
+				/* Fall through, let 'receive-pack' to execute it. */
+				hint->run_proc_receive = 0;
+			continue;
+		}
+
+		report = NULL;
+		new_report = 0;
+		refname = p;
+		p = strchr(refname, ' ');
+		if (p)
+			*p++ = '\0';
+		if (strcmp(head, "ok") && strcmp(head, "ng")) {
+			strbuf_addf(errmsg, "proc-receive reported bad status '%s' on ref '%s'\n",
+				    head, refname);
+			code = -1;
+			continue;
+		}
+
+		/* first try searching at our hint, falling back to all refs */
+		if (hint)
+			hint = find_command_by_refname(hint, refname);
+		if (!hint)
+			hint = find_command_by_refname(commands, refname);
+		if (!hint) {
+			strbuf_addf(errmsg, "proc-receive reported status on unknown ref: %s\n",
+				    refname);
+			code = -1;
+			continue;
+		}
+		if (!hint->run_proc_receive) {
+			strbuf_addf(errmsg, "proc-receive reported status on unexpected ref: %s\n",
+				    refname);
+			code = -1;
+			continue;
+		}
+		hint->run_proc_receive |= RUN_PROC_RECEIVE_RETURNED;
+		if (!strcmp(head, "ng")) {
+			if (p)
+				hint->error_string = xstrdup(p);
+			else
+				hint->error_string = "failed";
+			code = -1;
+			continue;
+		}
+		new_report = 1;
+	}
+
+	for (cmd = commands; cmd; cmd = cmd->next)
+		if (cmd->run_proc_receive && !cmd->error_string &&
+		    !(cmd->run_proc_receive & RUN_PROC_RECEIVE_RETURNED)) {
+		    cmd->error_string = "proc-receive failed to report status";
+		    code = -1;
+		}
+	return code;
+}
+
+static int run_proc_receive_hook(struct command *commands,
+				 const struct string_list *push_options)
+{
+	struct child_process proc = CHILD_PROCESS_INIT;
+	struct async muxer;
+	struct command *cmd;
+	const char *argv[2];
+	struct packet_reader reader;
+	struct strbuf cap = STRBUF_INIT;
+	struct strbuf errmsg = STRBUF_INIT;
+	int hook_use_push_options = 0;
+	int version = 0;
+	int code;
+
+	argv[0] = find_hook("proc-receive");
+	if (!argv[0]) {
+		rp_error("cannot find hook 'proc-receive'");
+		return -1;
+	}
+	argv[1] = NULL;
+
+	proc.argv = argv;
+	proc.in = -1;
+	proc.out = -1;
+	proc.trace2_hook_name = "proc-receive";
+
+	if (use_sideband) {
+		memset(&muxer, 0, sizeof(muxer));
+		muxer.proc = copy_to_sideband;
+		muxer.in = -1;
+		code = start_async(&muxer);
+		if (code)
+			return code;
+		proc.err = muxer.in;
+	} else {
+		proc.err = 0;
+	}
+
+	code = start_command(&proc);
+	if (code) {
+		if (use_sideband)
+			finish_async(&muxer);
+		return code;
+	}
+
+	sigchain_push(SIGPIPE, SIG_IGN);
+
+	/* Version negotiaton */
+	packet_reader_init(&reader, proc.out, NULL, 0,
+			   PACKET_READ_CHOMP_NEWLINE |
+			   PACKET_READ_GENTLE_ON_EOF);
+	if (use_atomic)
+		strbuf_addstr(&cap, " atomic");
+	if (use_push_options)
+		strbuf_addstr(&cap, " push-options");
+	if (cap.len) {
+		packet_write_fmt(proc.in, "version=1%c%s\n", '\0', cap.buf + 1);
+		strbuf_release(&cap);
+	} else {
+		packet_write_fmt(proc.in, "version=1\n");
+	}
+	packet_flush(proc.in);
+
+	for (;;) {
+		int linelen;
+
+		if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
+			break;
+
+		if (reader.pktlen > 8 && starts_with(reader.line, "version=")) {
+			version = atoi(reader.line + 8);
+			linelen = strlen(reader.line);
+			if (linelen < reader.pktlen) {
+				const char *feature_list = reader.line + linelen + 1;
+				if (parse_feature_request(feature_list, "push-options"))
+					hook_use_push_options = 1;
+			}
+		}
+	}
+
+	if (version != 1) {
+		strbuf_addf(&errmsg, "proc-receive version '%d' is not supported",
+			    version);
+		code = -1;
+		goto cleanup;
+	}
+
+	/* Send commands */
+	for (cmd = commands; cmd; cmd = cmd->next) {
+		if (!cmd->run_proc_receive || cmd->skip_update || cmd->error_string)
+			continue;
+		packet_write_fmt(proc.in, "%s %s %s",
+				 oid_to_hex(&cmd->old_oid),
+				 oid_to_hex(&cmd->new_oid),
+				 cmd->ref_name);
+	}
+	packet_flush(proc.in);
+
+	/* Send push options */
+	if (hook_use_push_options) {
+		struct string_list_item *item;
+
+		for_each_string_list_item(item, push_options)
+			packet_write_fmt(proc.in, "%s", item->string);
+		packet_flush(proc.in);
+	}
+
+	/* Read result from proc-receive */
+	code = read_proc_receive_report(&reader, commands, &errmsg);
+
+cleanup:
+	close(proc.in);
+	close(proc.out);
+	if (use_sideband)
+		finish_async(&muxer);
+	if (finish_command(&proc))
+		code = -1;
+	if (errmsg.len >0) {
+		char *p = errmsg.buf;
+
+		p += errmsg.len - 1;
+		if (*p == '\n')
+			*p = '\0';
+		rp_error("%s", errmsg.buf);
+		strbuf_release(&errmsg);
+	}
+	sigchain_pop(SIGPIPE);
+
+	return code;
+}
+
 static char *refuse_unconfigured_deny_msg =
 	N_("By default, updating the current branch in a non-bare repository\n"
 	   "is denied, because it will make the index and work tree inconsistent\n"
@@ -1415,7 +1795,7 @@
 	struct strbuf err = STRBUF_INIT;
 
 	for (cmd = commands; cmd; cmd = cmd->next) {
-		if (!should_process_cmd(cmd))
+		if (!should_process_cmd(cmd) || cmd->run_proc_receive)
 			continue;
 
 		transaction = ref_transaction_begin(&err);
@@ -1455,7 +1835,7 @@
 	}
 
 	for (cmd = commands; cmd; cmd = cmd->next) {
-		if (!should_process_cmd(cmd))
+		if (!should_process_cmd(cmd) || cmd->run_proc_receive)
 			continue;
 
 		cmd->error_string = update(cmd, si);
@@ -1491,6 +1871,7 @@
 	struct iterate_data data;
 	struct async muxer;
 	int err_fd = 0;
+	int run_proc_receive = 0;
 
 	if (unpacker_error) {
 		for (cmd = commands; cmd; cmd = cmd->next)
@@ -1520,6 +1901,22 @@
 
 	reject_updates_to_hidden(commands);
 
+	/*
+	 * Try to find commands that have special prefix in their reference names,
+	 * and mark them to run an external "proc-receive" hook later.
+	 */
+	if (proc_receive_ref) {
+		for (cmd = commands; cmd; cmd = cmd->next) {
+			if (!should_process_cmd(cmd))
+				continue;
+
+			if (proc_receive_ref_matches(cmd)) {
+				cmd->run_proc_receive = RUN_PROC_RECEIVE_SCHEDULED;
+				run_proc_receive = 1;
+			}
+		}
+	}
+
 	if (run_receive_hook(commands, "pre-receive", 0, push_options)) {
 		for (cmd = commands; cmd; cmd = cmd->next) {
 			if (!cmd->error_string)
@@ -1546,6 +1943,14 @@
 	free(head_name_to_free);
 	head_name = head_name_to_free = resolve_refdup("HEAD", 0, NULL, NULL);
 
+	if (run_proc_receive &&
+	    run_proc_receive_hook(commands, push_options))
+		for (cmd = commands; cmd; cmd = cmd->next)
+			if (!cmd->error_string &&
+			    !(cmd->run_proc_receive & RUN_PROC_RECEIVE_RETURNED) &&
+			    (cmd->run_proc_receive || use_atomic))
+				cmd->error_string = "fail to run proc-receive hook";
+
 	if (use_atomic)
 		execute_commands_atomic(commands, si);
 	else
@@ -1629,6 +2034,8 @@
 			int len = 0;
 			if (parse_feature_request(feature_list, "report-status"))
 				report_status = 1;
+			if (parse_feature_request(feature_list, "report-status-v2"))
+				report_status_v2 = 1;
 			if (parse_feature_request(feature_list, "side-band-64k"))
 				use_sideband = LARGE_PACKET_MAX;
 			if (parse_feature_request(feature_list, "quiet"))
@@ -1947,6 +2354,51 @@
 	strbuf_release(&buf);
 }
 
+static void report_v2(struct command *commands, const char *unpack_status)
+{
+	struct command *cmd;
+	struct strbuf buf = STRBUF_INIT;
+	struct ref_push_report *report;
+
+	packet_buf_write(&buf, "unpack %s\n",
+			 unpack_status ? unpack_status : "ok");
+	for (cmd = commands; cmd; cmd = cmd->next) {
+		int count = 0;
+
+		if (cmd->error_string) {
+			packet_buf_write(&buf, "ng %s %s\n",
+					 cmd->ref_name,
+					 cmd->error_string);
+			continue;
+		}
+		packet_buf_write(&buf, "ok %s\n",
+				 cmd->ref_name);
+		for (report = cmd->report; report; report = report->next) {
+			if (count++ > 0)
+				packet_buf_write(&buf, "ok %s\n",
+						 cmd->ref_name);
+			if (report->ref_name)
+				packet_buf_write(&buf, "option refname %s\n",
+						 report->ref_name);
+			if (report->old_oid)
+				packet_buf_write(&buf, "option old-oid %s\n",
+						 oid_to_hex(report->old_oid));
+			if (report->new_oid)
+				packet_buf_write(&buf, "option new-oid %s\n",
+						 oid_to_hex(report->new_oid));
+			if (report->forced_update)
+				packet_buf_write(&buf, "option forced-update\n");
+		}
+	}
+	packet_buf_flush(&buf);
+
+	if (use_sideband)
+		send_sideband(1, 1, buf.buf, buf.len, use_sideband);
+	else
+		write_or_die(1, buf.buf, buf.len);
+	strbuf_release(&buf);
+}
+
 static int delete_only(struct command *commands)
 {
 	struct command *cmd;
@@ -2055,7 +2507,9 @@
 				 &push_options);
 		if (pack_lockfile)
 			unlink_or_warn(pack_lockfile);
-		if (report_status)
+		if (report_status_v2)
+			report_v2(commands, unpack_status);
+		else if (report_status)
 			report(commands, unpack_status);
 		run_receive_hook(commands, "post-receive", 1,
 				 &push_options);
diff --git a/builtin/remote.c b/builtin/remote.c
index 542f56e..64b4b55 100644
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -1356,7 +1356,7 @@
 			result |= error(_("Not a valid ref: %s"), buf2.buf);
 		else if (create_symref(buf.buf, buf2.buf, "remote set-head"))
 			result |= error(_("Could not setup %s"), buf.buf);
-		if (opt_a)
+		else if (opt_a)
 			printf("%s/HEAD set to %s\n", argv[0], head_name);
 		free(head_name);
 	}
diff --git a/builtin/send-pack.c b/builtin/send-pack.c
index 2b9610f..7af148d 100644
--- a/builtin/send-pack.c
+++ b/builtin/send-pack.c
@@ -29,10 +29,12 @@
 static void print_helper_status(struct ref *ref)
 {
 	struct strbuf buf = STRBUF_INIT;
+	struct ref_push_report *report;
 
 	for (; ref; ref = ref->next) {
 		const char *msg = NULL;
 		const char *res;
+		int count = 0;
 
 		switch(ref->status) {
 		case REF_STATUS_NONE:
@@ -94,6 +96,23 @@
 		}
 		strbuf_addch(&buf, '\n');
 
+		if (ref->status == REF_STATUS_OK) {
+			for (report = ref->report; report; report = report->next) {
+				if (count++ > 0)
+					strbuf_addf(&buf, "ok %s\n", ref->name);
+				if (report->ref_name)
+					strbuf_addf(&buf, "option refname %s\n",
+						report->ref_name);
+				if (report->old_oid)
+					strbuf_addf(&buf, "option old-oid %s\n",
+						oid_to_hex(report->old_oid));
+				if (report->new_oid)
+					strbuf_addf(&buf, "option new-oid %s\n",
+						oid_to_hex(report->new_oid));
+				if (report->forced_update)
+					strbuf_addstr(&buf, "option forced-update\n");
+			}
+		}
 		write_or_die(1, buf.buf, buf.len);
 	}
 	strbuf_release(&buf);
diff --git a/builtin/shortlog.c b/builtin/shortlog.c
index c856c58..0a5c496 100644
--- a/builtin/shortlog.c
+++ b/builtin/shortlog.c
@@ -9,6 +9,7 @@
 #include "mailmap.h"
 #include "shortlog.h"
 #include "parse-options.h"
+#include "trailer.h"
 
 static char const * const shortlog_usage[] = {
 	N_("git shortlog [<options>] [<revision-range>] [[--] <path>...]"),
@@ -49,12 +50,12 @@
 }
 
 static void insert_one_record(struct shortlog *log,
-			      const char *author,
+			      const char *ident,
 			      const char *oneline)
 {
 	struct string_list_item *item;
 
-	item = string_list_insert(&log->list, author);
+	item = string_list_insert(&log->list, ident);
 
 	if (log->summary)
 		item->util = (void *)(UTIL_TO_INT(item) + 1);
@@ -97,8 +98,8 @@
 	}
 }
 
-static int parse_stdin_author(struct shortlog *log,
-			       struct strbuf *out, const char *in)
+static int parse_ident(struct shortlog *log,
+		       struct strbuf *out, const char *in)
 {
 	const char *mailbuf, *namebuf;
 	size_t namelen, maillen;
@@ -122,18 +123,33 @@
 
 static void read_from_stdin(struct shortlog *log)
 {
-	struct strbuf author = STRBUF_INIT;
-	struct strbuf mapped_author = STRBUF_INIT;
+	struct strbuf ident = STRBUF_INIT;
+	struct strbuf mapped_ident = STRBUF_INIT;
 	struct strbuf oneline = STRBUF_INIT;
 	static const char *author_match[2] = { "Author: ", "author " };
 	static const char *committer_match[2] = { "Commit: ", "committer " };
 	const char **match;
 
-	match = log->committer ? committer_match : author_match;
-	while (strbuf_getline_lf(&author, stdin) != EOF) {
+	if (HAS_MULTI_BITS(log->groups))
+		die(_("using multiple --group options with stdin is not supported"));
+
+	switch (log->groups) {
+	case SHORTLOG_GROUP_AUTHOR:
+		match = author_match;
+		break;
+	case SHORTLOG_GROUP_COMMITTER:
+		match = committer_match;
+		break;
+	case SHORTLOG_GROUP_TRAILER:
+		die(_("using --group=trailer with stdin is not supported"));
+	default:
+		BUG("unhandled shortlog group");
+	}
+
+	while (strbuf_getline_lf(&ident, stdin) != EOF) {
 		const char *v;
-		if (!skip_prefix(author.buf, match[0], &v) &&
-		    !skip_prefix(author.buf, match[1], &v))
+		if (!skip_prefix(ident.buf, match[0], &v) &&
+		    !skip_prefix(ident.buf, match[1], &v))
 			continue;
 		while (strbuf_getline_lf(&oneline, stdin) != EOF &&
 		       oneline.len)
@@ -142,23 +158,118 @@
 		       !oneline.len)
 			; /* discard blanks */
 
-		strbuf_reset(&mapped_author);
-		if (parse_stdin_author(log, &mapped_author, v) < 0)
+		strbuf_reset(&mapped_ident);
+		if (parse_ident(log, &mapped_ident, v) < 0)
 			continue;
 
-		insert_one_record(log, mapped_author.buf, oneline.buf);
+		insert_one_record(log, mapped_ident.buf, oneline.buf);
 	}
-	strbuf_release(&author);
-	strbuf_release(&mapped_author);
+	strbuf_release(&ident);
+	strbuf_release(&mapped_ident);
 	strbuf_release(&oneline);
 }
 
+struct strset_item {
+	struct hashmap_entry ent;
+	char value[FLEX_ARRAY];
+};
+
+struct strset {
+	struct hashmap map;
+};
+
+#define STRSET_INIT { { NULL } }
+
+static int strset_item_hashcmp(const void *hash_data,
+			       const struct hashmap_entry *entry,
+			       const struct hashmap_entry *entry_or_key,
+			       const void *keydata)
+{
+	const struct strset_item *a, *b;
+
+	a = container_of(entry, const struct strset_item, ent);
+	if (keydata)
+		return strcmp(a->value, keydata);
+
+	b = container_of(entry_or_key, const struct strset_item, ent);
+	return strcmp(a->value, b->value);
+}
+
+/*
+ * Adds "str" to the set if it was not already present; returns true if it was
+ * already there.
+ */
+static int strset_check_and_add(struct strset *ss, const char *str)
+{
+	unsigned int hash = strhash(str);
+	struct strset_item *item;
+
+	if (!ss->map.table)
+		hashmap_init(&ss->map, strset_item_hashcmp, NULL, 0);
+
+	if (hashmap_get_from_hash(&ss->map, hash, str))
+		return 1;
+
+	FLEX_ALLOC_STR(item, value, str);
+	hashmap_entry_init(&item->ent, hash);
+	hashmap_add(&ss->map, &item->ent);
+	return 0;
+}
+
+static void strset_clear(struct strset *ss)
+{
+	if (!ss->map.table)
+		return;
+	hashmap_free_entries(&ss->map, struct strset_item, ent);
+}
+
+static void insert_records_from_trailers(struct shortlog *log,
+					 struct strset *dups,
+					 struct commit *commit,
+					 struct pretty_print_context *ctx,
+					 const char *oneline)
+{
+	struct trailer_iterator iter;
+	const char *commit_buffer, *body;
+	struct strbuf ident = STRBUF_INIT;
+
+	/*
+	 * Using format_commit_message("%B") would be simpler here, but
+	 * this saves us copying the message.
+	 */
+	commit_buffer = logmsg_reencode(commit, NULL, ctx->output_encoding);
+	body = strstr(commit_buffer, "\n\n");
+	if (!body)
+		return;
+
+	trailer_iterator_init(&iter, body);
+	while (trailer_iterator_advance(&iter)) {
+		const char *value = iter.val.buf;
+
+		if (!string_list_has_string(&log->trailers, iter.key.buf))
+			continue;
+
+		strbuf_reset(&ident);
+		if (!parse_ident(log, &ident, value))
+			value = ident.buf;
+
+		if (strset_check_and_add(dups, value))
+			continue;
+		insert_one_record(log, value, oneline);
+	}
+	trailer_iterator_release(&iter);
+
+	strbuf_release(&ident);
+	unuse_commit_buffer(commit, commit_buffer);
+}
+
 void shortlog_add_commit(struct shortlog *log, struct commit *commit)
 {
-	struct strbuf author = STRBUF_INIT;
+	struct strbuf ident = STRBUF_INIT;
 	struct strbuf oneline = STRBUF_INIT;
+	struct strset dups = STRSET_INIT;
 	struct pretty_print_context ctx = {0};
-	const char *fmt;
+	const char *oneline_str;
 
 	ctx.fmt = CMIT_FMT_USERFORMAT;
 	ctx.abbrev = log->abbrev;
@@ -166,21 +277,38 @@
 	ctx.date_mode.type = DATE_NORMAL;
 	ctx.output_encoding = get_log_output_encoding();
 
-	fmt = log->committer ?
-		(log->email ? "%cN <%cE>" : "%cN") :
-		(log->email ? "%aN <%aE>" : "%aN");
-
-	format_commit_message(commit, fmt, &author, &ctx);
 	if (!log->summary) {
 		if (log->user_format)
 			pretty_print_commit(&ctx, commit, &oneline);
 		else
 			format_commit_message(commit, "%s", &oneline, &ctx);
 	}
+	oneline_str = oneline.len ? oneline.buf : "<none>";
 
-	insert_one_record(log, author.buf, oneline.len ? oneline.buf : "<none>");
+	if (log->groups & SHORTLOG_GROUP_AUTHOR) {
+		strbuf_reset(&ident);
+		format_commit_message(commit,
+				      log->email ? "%aN <%aE>" : "%aN",
+				      &ident, &ctx);
+		if (!HAS_MULTI_BITS(log->groups) ||
+		    !strset_check_and_add(&dups, ident.buf))
+			insert_one_record(log, ident.buf, oneline_str);
+	}
+	if (log->groups & SHORTLOG_GROUP_COMMITTER) {
+		strbuf_reset(&ident);
+		format_commit_message(commit,
+				      log->email ? "%cN <%cE>" : "%cN",
+				      &ident, &ctx);
+		if (!HAS_MULTI_BITS(log->groups) ||
+		    !strset_check_and_add(&dups, ident.buf))
+			insert_one_record(log, ident.buf, oneline_str);
+	}
+	if (log->groups & SHORTLOG_GROUP_TRAILER) {
+		insert_records_from_trailers(log, &dups, commit, &ctx, oneline_str);
+	}
 
-	strbuf_release(&author);
+	strset_clear(&dups);
+	strbuf_release(&ident);
 	strbuf_release(&oneline);
 }
 
@@ -241,6 +369,28 @@
 	return 0;
 }
 
+static int parse_group_option(const struct option *opt, const char *arg, int unset)
+{
+	struct shortlog *log = opt->value;
+	const char *field;
+
+	if (unset) {
+		log->groups = 0;
+		string_list_clear(&log->trailers, 0);
+	} else if (!strcasecmp(arg, "author"))
+		log->groups |= SHORTLOG_GROUP_AUTHOR;
+	else if (!strcasecmp(arg, "committer"))
+		log->groups |= SHORTLOG_GROUP_COMMITTER;
+	else if (skip_prefix(arg, "trailer:", &field)) {
+		log->groups |= SHORTLOG_GROUP_TRAILER;
+		string_list_append(&log->trailers, field);
+	} else
+		return error(_("unknown group type: %s"), arg);
+
+	return 0;
+}
+
+
 void shortlog_init(struct shortlog *log)
 {
 	memset(log, 0, sizeof(*log));
@@ -251,6 +401,8 @@
 	log->wrap = DEFAULT_WRAPLEN;
 	log->in1 = DEFAULT_INDENT1;
 	log->in2 = DEFAULT_INDENT2;
+	log->trailers.strdup_strings = 1;
+	log->trailers.cmp = strcasecmp;
 }
 
 int cmd_shortlog(int argc, const char **argv, const char *prefix)
@@ -260,8 +412,9 @@
 	int nongit = !startup_info->have_repository;
 
 	const struct option options[] = {
-		OPT_BOOL('c', "committer", &log.committer,
-			 N_("Group by committer rather than author")),
+		OPT_BIT('c', "committer", &log.groups,
+			N_("Group by committer rather than author"),
+			SHORTLOG_GROUP_COMMITTER),
 		OPT_BOOL('n', "numbered", &log.sort_by_number,
 			 N_("sort output according to the number of commits per author")),
 		OPT_BOOL('s', "summary", &log.summary,
@@ -271,6 +424,8 @@
 		OPT_CALLBACK_F('w', NULL, &log, N_("<w>[,<i1>[,<i2>]]"),
 			N_("Linewrap output"), PARSE_OPT_OPTARG,
 			&parse_wrap_args),
+		OPT_CALLBACK(0, "group", &log, N_("field"),
+			N_("Group by field"), parse_group_option),
 		OPT_END(),
 	};
 
@@ -311,6 +466,10 @@
 	log.abbrev = rev.abbrev;
 	log.file = rev.diffopt.file;
 
+	if (!log.groups)
+		log.groups = SHORTLOG_GROUP_AUTHOR;
+	string_list_sort(&log.trailers);
+
 	/* assume HEAD if from a tty */
 	if (!nongit && !rev.pending.nr && isatty(0))
 		add_head_to_pending(&rev);
diff --git a/builtin/tag.c b/builtin/tag.c
index 5cbd80d..ecf0117 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -26,7 +26,7 @@
 		"\t\t<tagname> [<head>]"),
 	N_("git tag -d <tagname>..."),
 	N_("git tag -l [-n[<num>]] [--contains <commit>] [--no-contains <commit>] [--points-at <object>]\n"
-		"\t\t[--format=<format>] [--[no-]merged [<commit>]] [<pattern>...]"),
+		"\t\t[--format=<format>] [--merged <commit>] [--no-merged <commit>] [<pattern>...]"),
 	N_("git tag -v [--format=<format>] <tagname>..."),
 	NULL
 };
@@ -457,8 +457,8 @@
 		if (argc == 0)
 			cmdmode = 'l';
 		else if (filter.with_commit || filter.no_commit ||
-			 filter.points_at.nr || filter.merge_commit ||
-			 filter.lines != -1)
+			 filter.reachable_from || filter.unreachable_from ||
+			 filter.points_at.nr || filter.lines != -1)
 			cmdmode = 'l';
 	}
 
@@ -509,7 +509,7 @@
 		die(_("--no-contains option is only allowed in list mode"));
 	if (filter.points_at.nr)
 		die(_("--points-at option is only allowed in list mode"));
-	if (filter.merge_commit)
+	if (filter.reachable_from || filter.unreachable_from)
 		die(_("--merged and --no-merged options are only allowed in list mode"));
 	if (cmdmode == 'd')
 		return for_each_tag_name(argv, delete_tag, NULL);
diff --git a/cache.h b/cache.h
index cee8aa5..c0072d4 100644
--- a/cache.h
+++ b/cache.h
@@ -629,7 +629,7 @@
 int init_db(const char *git_dir, const char *real_git_dir,
 	    const char *template_dir, int hash_algo,
 	    const char *initial_branch, unsigned int flags);
-void initialize_repository_version(int hash_algo);
+void initialize_repository_version(int hash_algo, int reinit);
 
 void sanitize_stdfds(void);
 int daemonize(void);
diff --git a/ci/lib.sh b/ci/lib.sh
index 3eefec5..821e366 100755
--- a/ci/lib.sh
+++ b/ci/lib.sh
@@ -178,6 +178,7 @@
 export DEVELOPER=1
 export DEFAULT_TEST_TARGET=prove
 export GIT_TEST_CLONE_2GB=true
+export SKIP_DASHED_BUILT_INS=YesPlease
 
 case "$jobname" in
 linux-clang|linux-gcc)
diff --git a/command-list.txt b/command-list.txt
index e5901f2..0e3204e 100644
--- a/command-list.txt
+++ b/command-list.txt
@@ -117,6 +117,7 @@
 git-ls-tree                             plumbinginterrogators
 git-mailinfo                            purehelpers
 git-mailsplit                           purehelpers
+git-maintenance                         mainporcelain
 git-merge                               mainporcelain           history
 git-merge-base                          plumbinginterrogators
 git-merge-file                          plumbingmanipulators
diff --git a/commit-graph.c b/commit-graph.c
index 0ed003e..cb042bd 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -172,7 +172,7 @@
 		       oid_hex);
 }
 
-static char *get_chain_filename(struct object_directory *odb)
+char *get_commit_graph_chain_filename(struct object_directory *odb)
 {
 	return xstrfmt("%s/info/commit-graphs/commit-graph-chain", odb->path);
 }
@@ -231,7 +231,8 @@
 	return 1;
 }
 
-struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st,
+struct commit_graph *load_commit_graph_one_fd_st(struct repository *r,
+						 int fd, struct stat *st,
 						 struct object_directory *odb)
 {
 	void *graph_map;
@@ -247,7 +248,7 @@
 	}
 	graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0);
 	close(fd);
-	ret = parse_commit_graph(graph_map, graph_size);
+	ret = parse_commit_graph(r, graph_map, graph_size);
 
 	if (ret)
 		ret->odb = odb;
@@ -287,7 +288,8 @@
 	return 0;
 }
 
-struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size)
+struct commit_graph *parse_commit_graph(struct repository *r,
+					void *graph_map, size_t graph_size)
 {
 	const unsigned char *data, *chunk_lookup;
 	uint32_t i;
@@ -325,6 +327,8 @@
 		return NULL;
 	}
 
+	prepare_repo_settings(r);
+
 	graph = alloc_commit_graph();
 
 	graph->hash_len = the_hash_algo->rawsz;
@@ -401,14 +405,14 @@
 		case GRAPH_CHUNKID_BLOOMINDEXES:
 			if (graph->chunk_bloom_indexes)
 				chunk_repeated = 1;
-			else
+			else if (r->settings.commit_graph_read_changed_paths)
 				graph->chunk_bloom_indexes = data + chunk_offset;
 			break;
 
 		case GRAPH_CHUNKID_BLOOMDATA:
 			if (graph->chunk_bloom_data)
 				chunk_repeated = 1;
-			else {
+			else if (r->settings.commit_graph_read_changed_paths) {
 				uint32_t hash_version;
 				graph->chunk_bloom_data = data + chunk_offset;
 				hash_version = get_be32(data + chunk_offset);
@@ -420,6 +424,7 @@
 				graph->bloom_filter_settings->hash_version = hash_version;
 				graph->bloom_filter_settings->num_hashes = get_be32(data + chunk_offset + 4);
 				graph->bloom_filter_settings->bits_per_entry = get_be32(data + chunk_offset + 8);
+				graph->bloom_filter_settings->max_changed_paths = DEFAULT_BLOOM_MAX_CHANGES;
 			}
 			break;
 		}
@@ -452,7 +457,8 @@
 	return NULL;
 }
 
-static struct commit_graph *load_commit_graph_one(const char *graph_file,
+static struct commit_graph *load_commit_graph_one(struct repository *r,
+						  const char *graph_file,
 						  struct object_directory *odb)
 {
 
@@ -464,7 +470,7 @@
 	if (!open_ok)
 		return NULL;
 
-	g = load_commit_graph_one_fd_st(fd, &st, odb);
+	g = load_commit_graph_one_fd_st(r, fd, &st, odb);
 
 	if (g)
 		g->filename = xstrdup(graph_file);
@@ -476,7 +482,7 @@
 						 struct object_directory *odb)
 {
 	char *graph_name = get_commit_graph_filename(odb);
-	struct commit_graph *g = load_commit_graph_one(graph_name, odb);
+	struct commit_graph *g = load_commit_graph_one(r, graph_name, odb);
 	free(graph_name);
 
 	return g;
@@ -523,7 +529,7 @@
 	struct stat st;
 	struct object_id *oids;
 	int i = 0, valid = 1, count;
-	char *chain_name = get_chain_filename(odb);
+	char *chain_name = get_commit_graph_chain_filename(odb);
 	FILE *fp;
 	int stat_res;
 
@@ -557,7 +563,7 @@
 		valid = 0;
 		for (odb = r->objects->odb; odb; odb = odb->next) {
 			char *graph_name = get_split_graph_filename(odb, line.buf);
-			struct commit_graph *g = load_commit_graph_one(graph_name, odb);
+			struct commit_graph *g = load_commit_graph_one(r, graph_name, odb);
 
 			free(graph_name);
 
@@ -667,6 +673,17 @@
 	return !!first_generation;
 }
 
+struct bloom_filter_settings *get_bloom_filter_settings(struct repository *r)
+{
+	struct commit_graph *g = r->objects->commit_graph;
+	while (g) {
+		if (g->bloom_filter_settings)
+			return g->bloom_filter_settings;
+		g = g->base_graph;
+	}
+	return NULL;
+}
+
 static void close_commit_graph_one(struct commit_graph *g)
 {
 	if (!g)
@@ -952,9 +969,14 @@
 		 changed_paths:1,
 		 order_by_pack:1;
 
-	const struct split_commit_graph_opts *split_opts;
+	const struct commit_graph_opts *opts;
 	size_t total_bloom_filter_data_size;
 	const struct bloom_filter_settings *bloom_settings;
+
+	int count_bloom_filter_computed;
+	int count_bloom_filter_not_computed;
+	int count_bloom_filter_trunc_empty;
+	int count_bloom_filter_trunc_large;
 };
 
 static int write_graph_chunk_fanout(struct hashfile *f,
@@ -1166,7 +1188,7 @@
 	uint32_t cur_pos = 0;
 
 	while (list < last) {
-		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list, 0);
+		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list);
 		size_t len = filter ? filter->len : 0;
 		cur_pos += len;
 		display_progress(ctx->progress, ++ctx->progress_cnt);
@@ -1185,6 +1207,7 @@
 	jw_object_intmax(&jw, "hash_version", ctx->bloom_settings->hash_version);
 	jw_object_intmax(&jw, "num_hashes", ctx->bloom_settings->num_hashes);
 	jw_object_intmax(&jw, "bits_per_entry", ctx->bloom_settings->bits_per_entry);
+	jw_object_intmax(&jw, "max_changed_paths", ctx->bloom_settings->max_changed_paths);
 	jw_end(&jw);
 
 	trace2_data_json("bloom", ctx->r, "settings", &jw);
@@ -1205,7 +1228,7 @@
 	hashwrite_be32(f, ctx->bloom_settings->bits_per_entry);
 
 	while (list < last) {
-		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list, 0);
+		struct bloom_filter *filter = get_bloom_filter(ctx->r, *list);
 		size_t len = filter ? filter->len : 0;
 
 		display_progress(ctx->progress, ++ctx->progress_cnt);
@@ -1270,8 +1293,8 @@
 {
 	int i;
 	struct commit *commit;
-	enum commit_graph_split_flags flags = ctx->split_opts ?
-		ctx->split_opts->flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
+	enum commit_graph_split_flags flags = ctx->opts ?
+		ctx->opts->split_flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
 
 	if (ctx->report_progress)
 		ctx->progress = start_delayed_progress(
@@ -1375,11 +1398,24 @@
 	stop_progress(&ctx->progress);
 }
 
+static void trace2_bloom_filter_write_statistics(struct write_commit_graph_context *ctx)
+{
+	trace2_data_intmax("commit-graph", ctx->r, "filter-computed",
+			   ctx->count_bloom_filter_computed);
+	trace2_data_intmax("commit-graph", ctx->r, "filter-not-computed",
+			   ctx->count_bloom_filter_not_computed);
+	trace2_data_intmax("commit-graph", ctx->r, "filter-trunc-empty",
+			   ctx->count_bloom_filter_trunc_empty);
+	trace2_data_intmax("commit-graph", ctx->r, "filter-trunc-large",
+			   ctx->count_bloom_filter_trunc_large);
+}
+
 static void compute_bloom_filters(struct write_commit_graph_context *ctx)
 {
 	int i;
 	struct progress *progress = NULL;
 	struct commit **sorted_commits;
+	int max_new_filters;
 
 	init_bloom_filters();
 
@@ -1396,13 +1432,34 @@
 	else
 		QSORT(sorted_commits, ctx->commits.nr, commit_gen_cmp);
 
+	max_new_filters = ctx->opts && ctx->opts->max_new_filters >= 0 ?
+		ctx->opts->max_new_filters : ctx->commits.nr;
+
 	for (i = 0; i < ctx->commits.nr; i++) {
+		enum bloom_filter_computed computed = 0;
 		struct commit *c = sorted_commits[i];
-		struct bloom_filter *filter = get_bloom_filter(ctx->r, c, 1);
-		ctx->total_bloom_filter_data_size += sizeof(unsigned char) * filter->len;
+		struct bloom_filter *filter = get_or_compute_bloom_filter(
+			ctx->r,
+			c,
+			ctx->count_bloom_filter_computed < max_new_filters,
+			ctx->bloom_settings,
+			&computed);
+		if (computed & BLOOM_COMPUTED) {
+			ctx->count_bloom_filter_computed++;
+			if (computed & BLOOM_TRUNC_EMPTY)
+				ctx->count_bloom_filter_trunc_empty++;
+			if (computed & BLOOM_TRUNC_LARGE)
+				ctx->count_bloom_filter_trunc_large++;
+		} else if (computed & BLOOM_NOT_COMPUTED)
+			ctx->count_bloom_filter_not_computed++;
+		ctx->total_bloom_filter_data_size += filter
+			? sizeof(unsigned char) * filter->len : 0;
 		display_progress(progress, i + 1);
 	}
 
+	if (trace2_is_enabled())
+		trace2_bloom_filter_write_statistics(ctx);
+
 	free(sorted_commits);
 	stop_progress(&progress);
 }
@@ -1431,7 +1488,7 @@
 
 int write_commit_graph_reachable(struct object_directory *odb,
 				 enum commit_graph_write_flags flags,
-				 const struct split_commit_graph_opts *split_opts)
+				 const struct commit_graph_opts *opts)
 {
 	struct oidset commits = OIDSET_INIT;
 	struct refs_cb_data data;
@@ -1448,7 +1505,7 @@
 	stop_progress(&data.progress);
 
 	result = write_commit_graph(odb, NULL, &commits,
-				    flags, split_opts);
+				    flags, opts);
 
 	oidset_clear(&commits);
 	return result;
@@ -1563,8 +1620,8 @@
 static void copy_oids_to_commits(struct write_commit_graph_context *ctx)
 {
 	uint32_t i;
-	enum commit_graph_split_flags flags = ctx->split_opts ?
-		ctx->split_opts->flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
+	enum commit_graph_split_flags flags = ctx->opts ?
+		ctx->opts->split_flags : COMMIT_GRAPH_SPLIT_UNSPECIFIED;
 
 	ctx->num_extra_edges = 0;
 	if (ctx->report_progress)
@@ -1646,15 +1703,6 @@
 	int num_chunks = 3;
 	uint64_t chunk_offset;
 	struct object_id file_hash;
-	struct bloom_filter_settings bloom_settings = DEFAULT_BLOOM_FILTER_SETTINGS;
-
-	if (!ctx->bloom_settings) {
-		bloom_settings.bits_per_entry = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_BITS_PER_ENTRY",
-							      bloom_settings.bits_per_entry);
-		bloom_settings.num_hashes = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_NUM_HASHES",
-							  bloom_settings.num_hashes);
-		ctx->bloom_settings = &bloom_settings;
-	}
 
 	if (ctx->split) {
 		struct strbuf tmp_file = STRBUF_INIT;
@@ -1675,7 +1723,7 @@
 	}
 
 	if (ctx->split) {
-		char *lock_name = get_chain_filename(ctx->odb);
+		char *lock_name = get_commit_graph_chain_filename(ctx->odb);
 
 		hold_lock_file_for_update_mode(&lk, lock_name,
 					       LOCK_DIE_ON_ERROR, 0444);
@@ -1858,13 +1906,13 @@
 	int max_commits = 0;
 	int size_mult = 2;
 
-	if (ctx->split_opts) {
-		max_commits = ctx->split_opts->max_commits;
+	if (ctx->opts) {
+		max_commits = ctx->opts->max_commits;
 
-		if (ctx->split_opts->size_multiple)
-			size_mult = ctx->split_opts->size_multiple;
+		if (ctx->opts->size_multiple)
+			size_mult = ctx->opts->size_multiple;
 
-		flags = ctx->split_opts->flags;
+		flags = ctx->opts->split_flags;
 	}
 
 	g = ctx->r->objects->commit_graph;
@@ -2042,10 +2090,10 @@
 	size_t dirnamelen;
 	timestamp_t expire_time = time(NULL);
 
-	if (ctx->split_opts && ctx->split_opts->expire_time)
-		expire_time = ctx->split_opts->expire_time;
+	if (ctx->opts && ctx->opts->expire_time)
+		expire_time = ctx->opts->expire_time;
 	if (!ctx->split) {
-		char *chain_file_name = get_chain_filename(ctx->odb);
+		char *chain_file_name = get_commit_graph_chain_filename(ctx->odb);
 		unlink(chain_file_name);
 		free(chain_file_name);
 		ctx->num_commit_graphs_after = 0;
@@ -2094,12 +2142,13 @@
 		       struct string_list *pack_indexes,
 		       struct oidset *commits,
 		       enum commit_graph_write_flags flags,
-		       const struct split_commit_graph_opts *split_opts)
+		       const struct commit_graph_opts *opts)
 {
 	struct write_commit_graph_context *ctx;
 	uint32_t i, count_distinct = 0;
 	int res = 0;
 	int replace = 0;
+	struct bloom_filter_settings bloom_settings = DEFAULT_BLOOM_FILTER_SETTINGS;
 
 	if (!commit_graph_compatible(the_repository))
 		return 0;
@@ -2110,9 +2159,17 @@
 	ctx->append = flags & COMMIT_GRAPH_WRITE_APPEND ? 1 : 0;
 	ctx->report_progress = flags & COMMIT_GRAPH_WRITE_PROGRESS ? 1 : 0;
 	ctx->split = flags & COMMIT_GRAPH_WRITE_SPLIT ? 1 : 0;
-	ctx->split_opts = split_opts;
+	ctx->opts = opts;
 	ctx->total_bloom_filter_data_size = 0;
 
+	bloom_settings.bits_per_entry = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_BITS_PER_ENTRY",
+						      bloom_settings.bits_per_entry);
+	bloom_settings.num_hashes = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_NUM_HASHES",
+						  bloom_settings.num_hashes);
+	bloom_settings.max_changed_paths = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS",
+							 bloom_settings.max_changed_paths);
+	ctx->bloom_settings = &bloom_settings;
+
 	if (flags & COMMIT_GRAPH_WRITE_BLOOM_FILTERS)
 		ctx->changed_paths = 1;
 	if (!(flags & COMMIT_GRAPH_NO_WRITE_BLOOM_FILTERS)) {
@@ -2150,15 +2207,15 @@
 			}
 		}
 
-		if (ctx->split_opts)
-			replace = ctx->split_opts->flags & COMMIT_GRAPH_SPLIT_REPLACE;
+		if (ctx->opts)
+			replace = ctx->opts->split_flags & COMMIT_GRAPH_SPLIT_REPLACE;
 	}
 
 	ctx->approx_nr_objects = approximate_object_count();
 	ctx->oids.alloc = ctx->approx_nr_objects / 32;
 
-	if (ctx->split && split_opts && ctx->oids.alloc > split_opts->max_commits)
-		ctx->oids.alloc = split_opts->max_commits;
+	if (ctx->split && opts && ctx->oids.alloc > opts->max_commits)
+		ctx->oids.alloc = opts->max_commits;
 
 	if (ctx->append) {
 		prepare_commit_graph_one(ctx->r, ctx->odb);
diff --git a/commit-graph.h b/commit-graph.h
index 09a9703..f8e9250 100644
--- a/commit-graph.h
+++ b/commit-graph.h
@@ -25,6 +25,7 @@
 struct string_list;
 
 char *get_commit_graph_filename(struct object_directory *odb);
+char *get_commit_graph_chain_filename(struct object_directory *odb);
 int open_commit_graph(const char *graph_file, int *fd, struct stat *st);
 
 /*
@@ -75,11 +76,13 @@
 	struct bloom_filter_settings *bloom_filter_settings;
 };
 
-struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st,
+struct commit_graph *load_commit_graph_one_fd_st(struct repository *r,
+						 int fd, struct stat *st,
 						 struct object_directory *odb);
 struct commit_graph *read_commit_graph_one(struct repository *r,
 					   struct object_directory *odb);
-struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size);
+struct commit_graph *parse_commit_graph(struct repository *r,
+					void *graph_map, size_t graph_size);
 
 /*
  * Return 1 if and only if the repository has a commit-graph
@@ -87,6 +90,8 @@
  */
 int generation_numbers_enabled(struct repository *r);
 
+struct bloom_filter_settings *get_bloom_filter_settings(struct repository *r);
+
 enum commit_graph_write_flags {
 	COMMIT_GRAPH_WRITE_APPEND     = (1 << 0),
 	COMMIT_GRAPH_WRITE_PROGRESS   = (1 << 1),
@@ -101,11 +106,12 @@
 	COMMIT_GRAPH_SPLIT_REPLACE          = 2
 };
 
-struct split_commit_graph_opts {
+struct commit_graph_opts {
 	int size_multiple;
 	int max_commits;
 	timestamp_t expire_time;
-	enum commit_graph_split_flags flags;
+	enum commit_graph_split_flags split_flags;
+	int max_new_filters;
 };
 
 /*
@@ -116,12 +122,12 @@
  */
 int write_commit_graph_reachable(struct object_directory *odb,
 				 enum commit_graph_write_flags flags,
-				 const struct split_commit_graph_opts *split_opts);
+				 const struct commit_graph_opts *opts);
 int write_commit_graph(struct object_directory *odb,
 		       struct string_list *pack_indexes,
 		       struct oidset *commits,
 		       enum commit_graph_write_flags flags,
-		       const struct split_commit_graph_opts *split_opts);
+		       const struct commit_graph_opts *opts);
 
 #define COMMIT_GRAPH_VERIFY_SHALLOW	(1 << 0)
 
diff --git a/commit-reach.c b/commit-reach.c
index efd5925..50175b1 100644
--- a/commit-reach.c
+++ b/commit-reach.c
@@ -321,7 +321,7 @@
 {
 	struct commit_list *bases;
 	int ret = 0, i;
-	uint32_t generation, min_generation = GENERATION_NUMBER_INFINITY;
+	uint32_t generation, max_generation = GENERATION_NUMBER_ZERO;
 
 	if (repo_parse_commit(r, commit))
 		return ret;
@@ -330,12 +330,12 @@
 			return ret;
 
 		generation = commit_graph_generation(reference[i]);
-		if (generation < min_generation)
-			min_generation = generation;
+		if (generation > max_generation)
+			max_generation = generation;
 	}
 
 	generation = commit_graph_generation(commit);
-	if (generation > min_generation)
+	if (generation > max_generation)
 		return ret;
 
 	bases = paint_down_to_common(r, commit,
diff --git a/compat/bswap.h b/compat/bswap.h
index e4e2573..c0bb744 100644
--- a/compat/bswap.h
+++ b/compat/bswap.h
@@ -145,28 +145,6 @@
 
 #endif
 
-/*
- * Performance might be improved if the CPU architecture is OK with
- * unaligned 32-bit loads and a fast ntohl() is available.
- * Otherwise fall back to byte loads and shifts which is portable,
- * and is faster on architectures with memory alignment issues.
- */
-
-#if !defined(NO_UNALIGNED_LOADS) && ( \
-    defined(__i386__) || defined(__x86_64__) || \
-    defined(_M_IX86) || defined(_M_X64) || \
-    defined(__ppc__) || defined(__ppc64__) || \
-    defined(__powerpc__) || defined(__powerpc64__) || \
-    defined(__s390__) || defined(__s390x__))
-
-#define get_be16(p)	ntohs(*(unsigned short *)(p))
-#define get_be32(p)	ntohl(*(unsigned int *)(p))
-#define get_be64(p)	ntohll(*(uint64_t *)(p))
-#define put_be32(p, v)	do { *(unsigned int *)(p) = htonl(v); } while (0)
-#define put_be64(p, v)	do { *(uint64_t *)(p) = htonll(v); } while (0)
-
-#else
-
 static inline uint16_t get_be16(const void *ptr)
 {
 	const unsigned char *p = ptr;
@@ -212,6 +190,4 @@
 	p[7] = value >>  0;
 }
 
-#endif
-
 #endif /* COMPAT_BSWAP_H */
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 9147fba..0a96ad8 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -1508,6 +1508,22 @@
 {
 	__git_has_doubledash && return
 
+	local dwim_opt="$(__git_checkout_default_dwim_mode)"
+
+	case "$prev" in
+	-b|-B|--orphan)
+		# Complete local branches (and DWIM branch
+		# remote branch names) for an option argument
+		# specifying a new branch name. This is for
+		# convenience, assuming new branches are
+		# possibly based on pre-existing branch names.
+		__git_complete_refs $dwim_opt --mode="heads"
+		return
+		;;
+	*)
+		;;
+	esac
+
 	case "$cur" in
 	--conflict=*)
 		__gitcomp "diff3 merge" "" "${cur##--conflict=}"
@@ -1516,23 +1532,6 @@
 		__gitcomp_builtin checkout
 		;;
 	*)
-		local dwim_opt="$(__git_checkout_default_dwim_mode)"
-		local prevword prevword="${words[cword-1]}"
-
-		case "$prevword" in
-			-b|-B|--orphan)
-				# Complete local branches (and DWIM branch
-				# remote branch names) for an option argument
-				# specifying a new branch name. This is for
-				# convenience, assuming new branches are
-				# possibly based on pre-existing branch names.
-				__git_complete_refs $dwim_opt --mode="heads"
-				return
-				;;
-			*)
-				;;
-		esac
-
 		# At this point, we've already handled special completion for
 		# the arguments to -b/-B, and --orphan. There are 3 main
 		# things left we can possibly complete:
@@ -1784,6 +1783,10 @@
 			" "" "${cur##--thread=}"
 		return
 		;;
+	--base=*|--interdiff=*|--range-diff=*)
+		__git_complete_refs --cur="${cur#--*=}"
+		return
+		;;
 	--*)
 		__gitcomp_builtin format-patch "$__git_format_patch_extra_options"
 		return
@@ -2388,6 +2391,22 @@
 
 _git_switch ()
 {
+	local dwim_opt="$(__git_checkout_default_dwim_mode)"
+
+	case "$prev" in
+	-c|-C|--orphan)
+		# Complete local branches (and DWIM branch
+		# remote branch names) for an option argument
+		# specifying a new branch name. This is for
+		# convenience, assuming new branches are
+		# possibly based on pre-existing branch names.
+		__git_complete_refs $dwim_opt --mode="heads"
+		return
+		;;
+	*)
+		;;
+	esac
+
 	case "$cur" in
 	--conflict=*)
 		__gitcomp "diff3 merge" "" "${cur##--conflict=}"
@@ -2396,23 +2415,6 @@
 		__gitcomp_builtin switch
 		;;
 	*)
-		local dwim_opt="$(__git_checkout_default_dwim_mode)"
-		local prevword prevword="${words[cword-1]}"
-
-		case "$prevword" in
-			-c|-C|--orphan)
-				# Complete local branches (and DWIM branch
-				# remote branch names) for an option argument
-				# specifying a new branch name. This is for
-				# convenience, assuming new branches are
-				# possibly based on pre-existing branch names.
-				__git_complete_refs $dwim_opt --mode="heads"
-				return
-				;;
-			*)
-				;;
-		esac
-
 		# Unlike in git checkout, git switch --orphan does not take
 		# a start point. Thus we really have nothing to complete after
 		# the branch name.
@@ -2839,6 +2841,13 @@
 
 _git_restore ()
 {
+	case "$prev" in
+	-s)
+		__git_complete_refs
+		return
+		;;
+	esac
+
 	case "$cur" in
 	--conflict=*)
 		__gitcomp "diff3 merge" "" "${cur##--conflict=}"
diff --git a/contrib/diff-highlight/DiffHighlight.pm b/contrib/diff-highlight/DiffHighlight.pm
index e258992..376f577 100644
--- a/contrib/diff-highlight/DiffHighlight.pm
+++ b/contrib/diff-highlight/DiffHighlight.pm
@@ -112,7 +112,7 @@
 	# Since we can receive arbitrary input, there's no optimal
 	# place to flush. Flushing on a blank line is a heuristic that
 	# happens to match git-log output.
-	if (!length) {
+	if (/^$/) {
 		$flush_cb->();
 	}
 }
diff --git a/contrib/mw-to-git/git-mw.perl b/contrib/mw-to-git/git-mw.perl
index 28df3ee..eb52a53 100755
--- a/contrib/mw-to-git/git-mw.perl
+++ b/contrib/mw-to-git/git-mw.perl
@@ -6,7 +6,7 @@
 # License: GPL v2 or later
 
 # Set of tools for git repo with a mediawiki remote.
-# Documentation & bugtracker: https://github.com/moy/Git-Mediawiki/
+# Documentation & bugtracker: https://github.com/Git-Mediawiki/Git-Mediawiki
 
 use strict;
 use warnings;
diff --git a/contrib/mw-to-git/git-remote-mediawiki.perl b/contrib/mw-to-git/git-remote-mediawiki.perl
index d8ff2e6..a562441 100755
--- a/contrib/mw-to-git/git-remote-mediawiki.perl
+++ b/contrib/mw-to-git/git-remote-mediawiki.perl
@@ -9,7 +9,7 @@
 # License: GPL v2 or later
 
 # Gateway between Git and MediaWiki.
-# Documentation & bugtracker: https://github.com/moy/Git-Mediawiki/
+# Documentation & bugtracker: https://github.com/Git-Mediawiki/Git-Mediawiki
 
 use strict;
 use MediaWiki::API;
@@ -56,38 +56,38 @@
 
 # Accept both space-separated and multiple keys in config file.
 # Spaces should be written as _ anyway because we'll use chomp.
-my @tracked_pages = split(/[ \n]/, run_git("config --get-all remote.${remotename}.pages"));
+my @tracked_pages = split(/[ \n]/, run_git_quoted(["config", "--get-all", "remote.${remotename}.pages"]));
 chomp(@tracked_pages);
 
 # Just like @tracked_pages, but for MediaWiki categories.
-my @tracked_categories = split(/[ \n]/, run_git("config --get-all remote.${remotename}.categories"));
+my @tracked_categories = split(/[ \n]/, run_git_quoted(["config", "--get-all", "remote.${remotename}.categories"]));
 chomp(@tracked_categories);
 
 # Just like @tracked_categories, but for MediaWiki namespaces.
-my @tracked_namespaces = split(/[ \n]/, run_git("config --get-all remote.${remotename}.namespaces"));
+my @tracked_namespaces = split(/[ \n]/, run_git_quoted(["config", "--get-all", "remote.${remotename}.namespaces"]));
 for (@tracked_namespaces) { s/_/ /g; }
 chomp(@tracked_namespaces);
 
 # Import media files on pull
-my $import_media = run_git("config --get --bool remote.${remotename}.mediaimport");
+my $import_media = run_git_quoted(["config", "--get", "--bool", "remote.${remotename}.mediaimport"]);
 chomp($import_media);
 $import_media = ($import_media eq 'true');
 
 # Export media files on push
-my $export_media = run_git("config --get --bool remote.${remotename}.mediaexport");
+my $export_media = run_git_quoted(["config", "--get", "--bool", "remote.${remotename}.mediaexport"]);
 chomp($export_media);
 $export_media = !($export_media eq 'false');
 
-my $wiki_login = run_git("config --get remote.${remotename}.mwLogin");
+my $wiki_login = run_git_quoted(["config", "--get", "remote.${remotename}.mwLogin"]);
 # Note: mwPassword is discouraged. Use the credential system instead.
-my $wiki_passwd = run_git("config --get remote.${remotename}.mwPassword");
-my $wiki_domain = run_git("config --get remote.${remotename}.mwDomain");
+my $wiki_passwd = run_git_quoted(["config", "--get", "remote.${remotename}.mwPassword"]);
+my $wiki_domain = run_git_quoted(["config", "--get", "remote.${remotename}.mwDomain"]);
 chomp($wiki_login);
 chomp($wiki_passwd);
 chomp($wiki_domain);
 
 # Import only last revisions (both for clone and fetch)
-my $shallow_import = run_git("config --get --bool remote.${remotename}.shallow");
+my $shallow_import = run_git_quoted(["config", "--get", "--bool", "remote.${remotename}.shallow"]);
 chomp($shallow_import);
 $shallow_import = ($shallow_import eq 'true');
 
@@ -97,9 +97,9 @@
 # Possible values:
 # - by_rev: perform one query per new revision on the remote wiki
 # - by_page: query each tracked page for new revision
-my $fetch_strategy = run_git("config --get remote.${remotename}.fetchStrategy");
+my $fetch_strategy = run_git_quoted(["config", "--get", "remote.${remotename}.fetchStrategy"]);
 if (!$fetch_strategy) {
-	$fetch_strategy = run_git('config --get mediawiki.fetchStrategy');
+	$fetch_strategy = run_git_quoted(["config", "--get", "mediawiki.fetchStrategy"]);
 }
 chomp($fetch_strategy);
 if (!$fetch_strategy) {
@@ -123,9 +123,9 @@
 # will get the history with information lost). If the import is
 # deterministic, this means everybody gets the same sha1 for each
 # MediaWiki revision.
-my $dumb_push = run_git("config --get --bool remote.${remotename}.dumbPush");
+my $dumb_push = run_git_quoted(["config", "--get", "--bool", "remote.${remotename}.dumbPush"]);
 if (!$dumb_push) {
-	$dumb_push = run_git('config --get --bool mediawiki.dumbPush');
+	$dumb_push = run_git_quoted(["config", "--get", "--bool", "mediawiki.dumbPush"]);
 }
 chomp($dumb_push);
 $dumb_push = ($dumb_push eq 'true');
@@ -369,12 +369,14 @@
 	return %pages;
 }
 
-# usage: $out = run_git("command args");
-#        $out = run_git("command args", "raw"); # don't interpret output as UTF-8.
-sub run_git {
+# usage: $out = run_git_quoted(["command", "args", ...]);
+#        $out = run_git_quoted(["command", "args", ...], "raw"); # don't interpret output as UTF-8.
+#        $out = run_git_quoted_nostderr(["command", "args", ...]); # discard stderr
+#        $out = run_git_quoted_nostderr(["command", "args", ...], "raw"); # ditto but raw instead of UTF-8 as above
+sub _run_git {
 	my $args = shift;
 	my $encoding = (shift || 'encoding(UTF-8)');
-	open(my $git, "-|:${encoding}", "git ${args}")
+	open(my $git, "-|:${encoding}", @$args)
 	    or die "Unable to fork: $!\n";
 	my $res = do {
 		local $/ = undef;
@@ -385,6 +387,13 @@
 	return $res;
 }
 
+sub run_git_quoted {
+    _run_git(["git", @{$_[0]}], $_[1]);
+}
+
+sub run_git_quoted_nostderr {
+    _run_git(['sh', '-c', 'git "$@" 2>/dev/null', '--', @{$_[0]}], $_[1]);
+}
 
 sub get_all_mediafiles {
 	my $pages = shift;
@@ -511,8 +520,9 @@
 }
 
 sub get_last_local_revision {
-	# Get note regarding last mediawiki revision
-	my $note = run_git("notes --ref=${remotename}/mediawiki show refs/mediawiki/${remotename}/master 2>/dev/null");
+	# Get note regarding last mediawiki revision.
+	my $note = run_git_quoted_nostderr(["notes", "--ref=${remotename}/mediawiki",
+					    "show", "refs/mediawiki/${remotename}/master"]);
 	my @note_info = split(/ /, $note);
 
 	my $lastrevision_number;
@@ -807,7 +817,10 @@
 sub mw_import {
 	# multiple import commands can follow each other.
 	my @refs = (shift, get_more_refs('import'));
+	my $processedRefs;
 	foreach my $ref (@refs) {
+		next if $processedRefs->{$ref}; # skip duplicates: "import refs/heads/master" being issued twice; TODO: why?
+		$processedRefs->{$ref} = 1;
 		mw_import_ref($ref);
 	}
 	print {*STDOUT} "done\n";
@@ -970,7 +983,7 @@
 }
 
 sub error_non_fast_forward {
-	my $advice = run_git('config --bool advice.pushNonFastForward');
+	my $advice = run_git_quoted(["config", "--bool", "advice.pushNonFastForward"]);
 	chomp($advice);
 	if ($advice ne 'false') {
 		# Native git-push would show this after the summary.
@@ -1014,7 +1027,7 @@
 		}
 	} else {
 		# Don't let perl try to interpret file content as UTF-8 => use "raw"
-		my $content = run_git("cat-file blob ${new_sha1}", 'raw');
+		my $content = run_git_quoted(["cat-file", "blob", $new_sha1], 'raw');
 		if ($content ne EMPTY) {
 			$mediawiki = connect_maybe($mediawiki, $remotename, $url);
 			$mediawiki->{config}->{upload_url} =
@@ -1084,7 +1097,7 @@
 			# with this content instead:
 			$file_content = DELETED_CONTENT;
 		} else {
-			$file_content = run_git("cat-file blob ${new_sha1}");
+			$file_content = run_git_quoted(["cat-file", "blob", $new_sha1]);
 		}
 
 		$mediawiki = connect_maybe($mediawiki, $remotename, $url);
@@ -1174,10 +1187,10 @@
 	my $mw_revision = $last_remote_revid;
 
 	# Get sha1 of commit pointed by local HEAD
-	my $HEAD_sha1 = run_git("rev-parse ${local} 2>/dev/null");
+	my $HEAD_sha1 = run_git_quoted_nostderr(["rev-parse", $local]);
 	chomp($HEAD_sha1);
 	# Get sha1 of commit pointed by remotes/$remotename/master
-	my $remoteorigin_sha1 = run_git("rev-parse refs/remotes/${remotename}/master 2>/dev/null");
+	my $remoteorigin_sha1 = run_git_quoted_nostderr(["rev-parse", "refs/remotes/${remotename}/master"]);
 	chomp($remoteorigin_sha1);
 
 	if ($last_local_revid > 0 &&
@@ -1197,7 +1210,7 @@
 		my $parsed_sha1 = $remoteorigin_sha1;
 		# Find a path from last MediaWiki commit to pushed commit
 		print {*STDERR} "Computing path from local to remote ...\n";
-		my @local_ancestry = split(/\n/, run_git("rev-list --boundary --parents ${local} ^${parsed_sha1}"));
+		my @local_ancestry = split(/\n/, run_git_quoted(["rev-list", "--boundary", "--parents", $local, "^${parsed_sha1}"]));
 		my %local_ancestry;
 		foreach my $line (@local_ancestry) {
 			if (my ($child, $parents) = $line =~ /^-?([a-f0-9]+) ([a-f0-9 ]+)/) {
@@ -1221,7 +1234,7 @@
 		# No remote mediawiki revision. Export the whole
 		# history (linearized with --first-parent)
 		print {*STDERR} "Warning: no common ancestor, pushing complete history\n";
-		my $history = run_git("rev-list --first-parent --children ${local}");
+		my $history = run_git_quoted(["rev-list", "--first-parent", "--children", $local]);
 		my @history = split(/\n/, $history);
 		@history = @history[1..$#history];
 		foreach my $line (reverse @history) {
@@ -1233,12 +1246,12 @@
 	foreach my $commit_info_split (@commit_pairs) {
 		my $sha1_child = @{$commit_info_split}[0];
 		my $sha1_commit = @{$commit_info_split}[1];
-		my $diff_infos = run_git("diff-tree -r --raw -z ${sha1_child} ${sha1_commit}");
+		my $diff_infos = run_git_quoted(["diff-tree", "-r", "--raw", "-z", $sha1_child, $sha1_commit]);
 		# TODO: we could detect rename, and encode them with a #redirect on the wiki.
 		# TODO: for now, it's just a delete+add
 		my @diff_info_list = split(/\0/, $diff_infos);
 		# Keep the subject line of the commit message as mediawiki comment for the revision
-		my $commit_msg = run_git(qq(log --no-walk --format="%s" ${sha1_commit}));
+		my $commit_msg = run_git_quoted(["log", "--no-walk", '--format="%s"', $sha1_commit]);
 		chomp($commit_msg);
 		# Push every blob
 		while (@diff_info_list) {
@@ -1263,7 +1276,10 @@
 			}
 		}
 		if (!$dumb_push) {
-			run_git(qq(notes --ref=${remotename}/mediawiki add -f -m "mediawiki_revision: ${mw_revision}" ${sha1_commit}));
+			run_git_quoted(["notes", "--ref=${remotename}/mediawiki",
+					"add", "-f", "-m",
+					"mediawiki_revision: ${mw_revision}",
+					$sha1_commit]);
 		}
 	}
 
@@ -1304,7 +1320,7 @@
 		# already cached. Namespaces are stored in form:
 		# "Name_of_namespace:Id_namespace", ex.: "File:6".
 		my @temp = split(/\n/,
-				 run_git("config --get-all remote.${remotename}.namespaceCache"));
+				 run_git_quoted(["config", "--get-all", "remote.${remotename}.namespaceCache"]));
 		chomp(@temp);
 		foreach my $ns (@temp) {
 			my ($n, $id) = split(/:/, $ns);
@@ -1358,7 +1374,7 @@
 
 	# Store explicitly requested namespaces on disk
 	if (!exists $cached_mw_namespace_id{$name}) {
-		run_git(qq(config --add remote.${remotename}.namespaceCache "${name}:${store_id}"));
+		run_git_quoted(["config", "--add", "remote.${remotename}.namespaceCache", "${name}:${store_id}"]);
 		$cached_mw_namespace_id{$name} = 1;
 	}
 	return $id;
diff --git a/contrib/mw-to-git/git-remote-mediawiki.txt b/contrib/mw-to-git/git-remote-mediawiki.txt
index 23b7ef9..5da825f 100644
--- a/contrib/mw-to-git/git-remote-mediawiki.txt
+++ b/contrib/mw-to-git/git-remote-mediawiki.txt
@@ -4,4 +4,4 @@
 repository thanks to remote-helpers.
 
 For more information, visit the wiki at
-https://github.com/moy/Git-Mediawiki/wiki
+https://github.com/Git-Mediawiki/Git-Mediawiki
diff --git a/contrib/mw-to-git/t/.gitignore b/contrib/mw-to-git/t/.gitignore
index a7a40b4..2b8dc30 100644
--- a/contrib/mw-to-git/t/.gitignore
+++ b/contrib/mw-to-git/t/.gitignore
@@ -1,4 +1,4 @@
 WEB/
-wiki/
+mediawiki/
 trash directory.t*/
 test-results/
diff --git a/contrib/mw-to-git/t/README b/contrib/mw-to-git/t/README
index 2ee34be..72c4889 100644
--- a/contrib/mw-to-git/t/README
+++ b/contrib/mw-to-git/t/README
@@ -14,11 +14,11 @@
 adapted for another distribution):
 
 * lighttpd
-* php5
-* php5-cgi
-* php5-cli
-* php5-curl
-* php5-sqlite
+* php
+* php-cgi
+* php-cli
+* php-curl
+* php-sqlite
 
 Principles and Technical Choices
 --------------------------------
diff --git a/contrib/mw-to-git/t/install-wiki/.gitignore b/contrib/mw-to-git/t/install-wiki/.gitignore
deleted file mode 100644
index b5a2a44..0000000
--- a/contrib/mw-to-git/t/install-wiki/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-wikidb.sqlite
diff --git a/contrib/mw-to-git/t/install-wiki/LocalSettings.php b/contrib/mw-to-git/t/install-wiki/LocalSettings.php
deleted file mode 100644
index 745e47e..0000000
--- a/contrib/mw-to-git/t/install-wiki/LocalSettings.php
+++ /dev/null
@@ -1,129 +0,0 @@
-<?php
-# This file was automatically generated by the MediaWiki 1.19.0
-# installer. If you make manual changes, please keep track in case you
-# need to recreate them later.
-#
-# See includes/DefaultSettings.php for all configurable settings
-# and their default values, but don't forget to make changes in _this_
-# file, not there.
-#
-# Further documentation for configuration settings may be found at:
-# http://www.mediawiki.org/wiki/Manual:Configuration_settings
-
-# Protect against web entry
-if ( !defined( 'MEDIAWIKI' ) ) {
-	exit;
-}
-
-## Uncomment this to disable output compression
-# $wgDisableOutputCompression = true;
-
-$wgSitename      = "Git-MediaWiki-Test";
-$wgMetaNamespace = "Git-MediaWiki-Test";
-
-## The URL base path to the directory containing the wiki;
-## defaults for all runtime URL paths are based off of this.
-## For more information on customizing the URLs please see:
-## http://www.mediawiki.org/wiki/Manual:Short_URL
-$wgScriptPath       = "@WG_SCRIPT_PATH@";
-$wgScriptExtension  = ".php";
-
-## The protocol and server name to use in fully-qualified URLs
-$wgServer           = "@WG_SERVER@";
-
-## The relative URL path to the skins directory
-$wgStylePath        = "$wgScriptPath/skins";
-
-## The relative URL path to the logo.  Make sure you change this from the default,
-## or else you'll overwrite your logo when you upgrade!
-$wgLogo             = "$wgStylePath/common/images/wiki.png";
-
-## UPO means: this is also a user preference option
-
-$wgEnableEmail      = true;
-$wgEnableUserEmail  = true; # UPO
-
-$wgEmergencyContact = "apache@localhost";
-$wgPasswordSender   = "apache@localhost";
-
-$wgEnotifUserTalk      = false; # UPO
-$wgEnotifWatchlist     = false; # UPO
-$wgEmailAuthentication = true;
-
-## Database settings
-$wgDBtype           = "sqlite";
-$wgDBserver         = "";
-$wgDBname           = "@WG_SQLITE_DATAFILE@";
-$wgDBuser           = "";
-$wgDBpassword       = "";
-
-# SQLite-specific settings
-$wgSQLiteDataDir    = "@WG_SQLITE_DATADIR@";
-
-
-## Shared memory settings
-$wgMainCacheType    = CACHE_NONE;
-$wgMemCachedServers = array();
-
-## To enable image uploads, make sure the 'images' directory
-## is writable, then set this to true:
-$wgEnableUploads  = true;
-$wgUseImageMagick = true;
-$wgImageMagickConvertCommand ="@CONVERT@";
-$wgFileExtensions[] = 'txt';
-
-# InstantCommons allows wiki to use images from http://commons.wikimedia.org
-$wgUseInstantCommons  = false;
-
-## If you use ImageMagick (or any other shell command) on a
-## Linux server, this will need to be set to the name of an
-## available UTF-8 locale
-$wgShellLocale = "en_US.utf8";
-
-## If you want to use image uploads under safe mode,
-## create the directories images/archive, images/thumb and
-## images/temp, and make them all writable. Then uncomment
-## this, if it's not already uncommented:
-#$wgHashedUploadDirectory = false;
-
-## Set $wgCacheDirectory to a writable directory on the web server
-## to make your wiki go slightly faster. The directory should not
-## be publicly accessible from the web.
-#$wgCacheDirectory = "$IP/cache";
-
-# Site language code, should be one of the list in ./languages/Names.php
-$wgLanguageCode = "en";
-
-$wgSecretKey = "1c912bfe3519fb70f5dc523ecc698111cd43d81a11c585b3eefb28f29c2699b7";
-#$wgSecretKey = "@SECRETKEY@";
-
-
-# Site upgrade key. Must be set to a string (default provided) to turn on the
-# web installer while LocalSettings.php is in place
-$wgUpgradeKey = "ddae7dc87cd0a645";
-
-## Default skin: you can change the default skin. Use the internal symbolic
-## names, ie 'standard', 'nostalgia', 'cologneblue', 'monobook', 'vector':
-$wgDefaultSkin = "vector";
-
-## For attaching licensing metadata to pages, and displaying an
-## appropriate copyright notice / icon. GNU Free Documentation
-## License and Creative Commons licenses are supported so far.
-$wgRightsPage = ""; # Set to the title of a wiki page that describes your license/copyright
-$wgRightsUrl  = "";
-$wgRightsText = "";
-$wgRightsIcon = "";
-
-# Path to the GNU diff3 utility. Used for conflict resolution.
-$wgDiff3 = "/usr/bin/diff3";
-
-# Query string length limit for ResourceLoader. You should only set this if
-# your web server has a query string length limit (then set it to that limit),
-# or if you have suhosin.get.max_value_length set in php.ini (then set it to
-# that value)
-$wgResourceLoaderMaxQueryLength = -1;
-
-
-
-# End of automatically generated settings.
-# Add more configuration options below.
diff --git a/contrib/mw-to-git/t/install-wiki/db_install.php b/contrib/mw-to-git/t/install-wiki/db_install.php
deleted file mode 100644
index b033849..0000000
--- a/contrib/mw-to-git/t/install-wiki/db_install.php
+++ /dev/null
@@ -1,120 +0,0 @@
-<?php
-/**
- * This script generates a SQLite database for a MediaWiki version 1.19.0
- * You must specify the login of the admin (argument 1) and its
- * password (argument 2) and the folder where the database file
- * is located (absolute path in argument 3).
- * It is used by the script install-wiki.sh in order to make easy the
- * installation of a MediaWiki.
- *
- * In order to generate a SQLite database file, MediaWiki ask the user
- * to submit some forms in its web browser. This script simulates this
- * behavior though the functions <get> and <submit>
- *
- */
-$argc = $_SERVER['argc'];
-$argv = $_SERVER['argv'];
-
-$login = $argv[2];
-$pass = $argv[3];
-$tmp = $argv[4];
-$port = $argv[5];
-
-$url = 'http://localhost:'.$port.'/wiki/mw-config/index.php';
-$db_dir = urlencode($tmp);
-$tmp_cookie = tempnam($tmp, "COOKIE_");
-/*
- * Fetches a page with cURL.
- */
-function get($page_name = "") {
-	$curl = curl_init();
-	$page_name_add = "";
-	if ($page_name != "") {
-		$page_name_add = '?page='.$page_name;
-	}
-	$url = $GLOBALS['url'].$page_name_add;
-	$tmp_cookie = $GLOBALS['tmp_cookie'];
-	curl_setopt($curl, CURLOPT_COOKIEJAR, $tmp_cookie);
-	curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
-	curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
-	curl_setopt($curl, CURLOPT_COOKIEFILE, $tmp_cookie);
-	curl_setopt($curl, CURLOPT_HEADER, true);
-	curl_setopt($curl, CURLOPT_URL, $url);
-
-	$page = curl_exec($curl);
-	if (!$page) {
-		die("Could not get page: $url\n");
-	}
-	curl_close($curl);
-	return $page;
-}
-
-/*
- * Submits a form with cURL.
- */
-function submit($page_name, $option = "") {
-	$curl = curl_init();
-	$datapost = 'submit-continue=Continue+%E2%86%92';
-	if ($option != "") {
-		$datapost = $option.'&'.$datapost;
-	}
-	$url = $GLOBALS['url'].'?page='.$page_name;
-	$tmp_cookie = $GLOBALS['tmp_cookie'];
-	curl_setopt($curl, CURLOPT_URL, $url);
-	curl_setopt($curl, CURLOPT_POST, true);
-	curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
-	curl_setopt($curl, CURLOPT_POSTFIELDS, $datapost);
-	curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
-	curl_setopt($curl, CURLOPT_COOKIEJAR, $tmp_cookie);
-	curl_setopt($curl, CURLOPT_COOKIEFILE, $tmp_cookie);
-
-	$page = curl_exec($curl);
-	if (!$page) {
-		die("Could not get page: $url\n");
-	}
-	curl_close($curl);
-	return "$page";
-}
-
-/*
- * Here starts this script: simulates the behavior of the user
- * submitting forms to generates the database file.
- * Note this simulation was made for the MediaWiki version 1.19.0,
- * we can't assume it works with other versions.
- *
- */
-
-$page = get();
-if (!preg_match('/input type="hidden" value="([0-9]+)" name="LanguageRequestTime"/',
-		$page, $matches)) {
-	echo "Unexpected content for page downloaded:\n";
-	echo "$page";
-	die;
-};
-$timestamp = $matches[1];
-$language = "LanguageRequestTime=$timestamp&uselang=en&ContLang=en";
-$page = submit('Language', $language);
-
-submit('Welcome');
-
-$db_config = 'DBType=sqlite';
-$db_config = $db_config.'&sqlite_wgSQLiteDataDir='.$db_dir;
-$db_config = $db_config.'&sqlite_wgDBname='.$argv[1];
-submit('DBConnect', $db_config);
-
-$wiki_config = 'config_wgSitename=TEST';
-$wiki_config = $wiki_config.'&config__NamespaceType=site-name';
-$wiki_config = $wiki_config.'&config_wgMetaNamespace=MyWiki';
-$wiki_config = $wiki_config.'&config__AdminName='.$login;
-
-$wiki_config = $wiki_config.'&config__AdminPassword='.$pass;
-$wiki_config = $wiki_config.'&config__AdminPassword2='.$pass;
-
-$wiki_config = $wiki_config.'&wiki__configEmail=email%40email.org';
-$wiki_config = $wiki_config.'&config__SkipOptional=skip';
-submit('Name', $wiki_config);
-submit('Install');
-submit('Install');
-
-unlink($tmp_cookie);
-?>
diff --git a/contrib/mw-to-git/t/t9360-mw-to-git-clone.sh b/contrib/mw-to-git/t/t9360-mw-to-git-clone.sh
index 9106833..4c39bda 100755
--- a/contrib/mw-to-git/t/t9360-mw-to-git-clone.sh
+++ b/contrib/mw-to-git/t/t9360-mw-to-git-clone.sh
@@ -28,7 +28,7 @@
 		git log --format=%s HEAD^..HEAD >log.tmp
 	) &&
 	echo "this must be the same" >msg.tmp &&
-	diff -b mw_dir_1/log.tmp msg.tmp
+	test_cmp msg.tmp mw_dir_1/log.tmp
 '
 
 
@@ -50,8 +50,8 @@
 	echo "this must be the same" >>msgDaddy.tmp &&
 	echo "identical too" >msgDj.tmp &&
 	echo "identical" >>msgDj.tmp &&
-	diff -b mw_dir_2/logDaddy.tmp msgDaddy.tmp &&
-	diff -b mw_dir_2/logDj.tmp msgDj.tmp
+	test_cmp msgDaddy.tmp mw_dir_2/logDaddy.tmp &&
+	test_cmp msgDj.tmp mw_dir_2/logDj.tmp
 '
 
 
@@ -135,7 +135,7 @@
 		cd mw_dir_8 &&
 		echo "this log must stay" >msg.tmp &&
 		git log --format=%s >log.tmp &&
-		diff -b msg.tmp log.tmp
+		test_cmp msg.tmp log.tmp
 	) &&
 	wiki_check_content mw_dir_8/Namnam.mw Namnam
 '
diff --git a/contrib/mw-to-git/t/t9363-mw-to-git-export-import.sh b/contrib/mw-to-git/t/t9363-mw-to-git-export-import.sh
index 3ff3a09..6187ec6 100755
--- a/contrib/mw-to-git/t/t9363-mw-to-git-export-import.sh
+++ b/contrib/mw-to-git/t/t9363-mw-to-git-export-import.sh
@@ -27,12 +27,12 @@
 
 # Don't bother with permissions, be administrator by default
 test_expect_success 'setup config' '
-	git config --global remote.origin.mwLogin WikiAdmin &&
-	git config --global remote.origin.mwPassword AdminPass &&
+	git config --global remote.origin.mwLogin "$WIKI_ADMIN" &&
+	git config --global remote.origin.mwPassword "$WIKI_PASSW" &&
 	test_might_fail git config --global --unset remote.origin.mediaImport
 '
 
-test_expect_success 'git push can upload media (File:) files' '
+test_expect_failure 'git push can upload media (File:) files' '
 	wiki_reset &&
 	git clone mediawiki::'"$WIKI_URL"' mw_dir &&
 	(
@@ -48,13 +48,14 @@
 	)
 '
 
-test_expect_success 'git clone works on previously created wiki with media files' '
+test_expect_failure 'git clone works on previously created wiki with media files' '
 	test_when_finished "rm -rf mw_dir mw_dir_clone" &&
 	git clone -c remote.origin.mediaimport=true \
 		mediawiki::'"$WIKI_URL"' mw_dir_clone &&
 	test_cmp mw_dir_clone/Foo.txt mw_dir/Foo.txt &&
 	(cd mw_dir_clone && git checkout HEAD^) &&
 	(cd mw_dir && git checkout HEAD^) &&
+	test_path_is_file mw_dir_clone/Foo.txt &&
 	test_cmp mw_dir_clone/Foo.txt mw_dir/Foo.txt
 '
 
diff --git a/contrib/mw-to-git/t/test-gitmw-lib.sh b/contrib/mw-to-git/t/test-gitmw-lib.sh
index 3948a00..64e46c1 100755
--- a/contrib/mw-to-git/t/test-gitmw-lib.sh
+++ b/contrib/mw-to-git/t/test-gitmw-lib.sh
@@ -13,7 +13,8 @@
 
 . ./test.config
 
-WIKI_URL=http://"$SERVER_ADDR:$PORT/$WIKI_DIR_NAME"
+WIKI_BASE_URL=http://$SERVER_ADDR:$PORT
+WIKI_URL=$WIKI_BASE_URL/$WIKI_DIR_NAME
 CURR_DIR=$(pwd)
 TEST_OUTPUT_DIRECTORY=$(pwd)
 TEST_DIRECTORY="$CURR_DIR"/../../../t
@@ -65,7 +66,7 @@
 	GIT_EXEC_PATH=$(cd "$(dirname "$0")" && cd "../.." && pwd)
 	PATH="$GIT_EXEC_PATH"'/bin-wrapper:'"$PATH"
 
-	if [ ! -d "$WIKI_DIR_INST/$WIKI_DIR_NAME" ];
+	if ! test -d "$WIKI_DIR_INST/$WIKI_DIR_NAME"
 	then
 		skip_all='skipping gateway git-mw tests, no mediawiki found'
 		test_done
@@ -291,27 +292,59 @@
 	test -f "$WEB_TMP/pid" && kill $(cat "$WEB_TMP/pid")
 }
 
-# Create the SQLite database of the MediaWiki. If the database file already
-# exists, it will be deleted.
-# This script should be runned from the directory where $FILES_FOLDER is
-# located.
-create_db () {
-	rm -f "$TMP/$DB_FILE"
+wiki_delete_db () {
+	rm -rf \
+	   "$FILES_FOLDER_DB"/* || error "Couldn't delete $FILES_FOLDER_DB/"
+}
 
-	echo "Generating the SQLite database file. It can take some time ..."
-	# Run the php script to generate the SQLite database file
-	# with cURL calls.
-	php "$FILES_FOLDER/$DB_INSTALL_SCRIPT" $(basename "$DB_FILE" .sqlite) \
-		"$WIKI_ADMIN" "$WIKI_PASSW" "$TMP" "$PORT"
+wiki_delete_db_backup () {
+	rm -rf \
+	   "$FILES_FOLDER_POST_INSTALL_DB"/* || error "Couldn't delete $FILES_FOLDER_POST_INSTALL_DB/"
+}
 
-	if [ ! -f "$TMP/$DB_FILE" ] ; then
-		error "Can't create database file $TMP/$DB_FILE. Try to run ./install-wiki.sh delete first."
+# Install MediaWiki using its install.php script. If the database file
+# already exists, it will be deleted.
+install_mediawiki () {
+
+	localsettings="$WIKI_DIR_INST/$WIKI_DIR_NAME/LocalSettings.php"
+	if test -f "$localsettings"
+	then
+		error "We already installed the wiki, since $localsettings exists" \
+		      "perhaps you wanted to run 'delete' first?"
 	fi
 
-	# Copy the generated database file into the directory the
-	# user indicated.
-	cp "$TMP/$DB_FILE" "$FILES_FOLDER" ||
-		error "Unable to copy $TMP/$DB_FILE to $FILES_FOLDER"
+	wiki_delete_db
+	wiki_delete_db_backup
+	mkdir \
+		"$FILES_FOLDER_DB/" \
+		"$FILES_FOLDER_POST_INSTALL_DB/"
+
+	install_script="$WIKI_DIR_INST/$WIKI_DIR_NAME/maintenance/install.php"
+	echo "Installing MediaWiki using $install_script. This may take some time ..."
+
+	php "$WIKI_DIR_INST/$WIKI_DIR_NAME/maintenance/install.php" \
+	    --server $WIKI_BASE_URL \
+	    --scriptpath /wiki \
+	    --lang en \
+	    --dbtype sqlite \
+	    --dbpath $PWD/$FILES_FOLDER_DB/ \
+	    --pass "$WIKI_PASSW" \
+	    Git-MediaWiki-Test \
+	    "$WIKI_ADMIN" ||
+		error "Couldn't run $install_script, see errors above. Try to run ./install-wiki.sh delete first."
+	cat <<-'EOF' >>$localsettings
+# Custom settings added by test-gitmw-lib.sh
+#
+# Uploading text files is needed for
+# t9363-mw-to-git-export-import.sh
+$wgEnableUploads = true;
+$wgFileExtensions[] = 'txt';
+EOF
+
+	# Copy the initially generated database file into our backup
+	# folder
+	cp -R "$FILES_FOLDER_DB/"* "$FILES_FOLDER_POST_INSTALL_DB/" ||
+		error "Unable to copy $FILES_FOLDER_DB/* to $FILES_FOLDER_POST_INSTALL_DB/*"
 }
 
 # Install a wiki in your web server directory.
@@ -320,30 +353,33 @@
 		start_lighttpd
 	fi
 
-	SERVER_ADDR=$SERVER_ADDR:$PORT
 	# In this part, we change directory to $TMP in order to download,
 	# unpack and copy the files of MediaWiki
 	(
 	mkdir -p "$WIKI_DIR_INST/$WIKI_DIR_NAME"
-	if [ ! -d "$WIKI_DIR_INST/$WIKI_DIR_NAME" ] ; then
+	if ! test -d "$WIKI_DIR_INST/$WIKI_DIR_NAME"
+	then
 		error "Folder $WIKI_DIR_INST/$WIKI_DIR_NAME doesn't exist.
 		Please create it and launch the script again."
 	fi
 
-	# Fetch MediaWiki's archive if not already present in the TMP directory
+	# Fetch MediaWiki's archive if not already present in the
+	# download directory
+	mkdir -p "$FILES_FOLDER_DOWNLOAD"
 	MW_FILENAME="mediawiki-$MW_VERSION_MAJOR.$MW_VERSION_MINOR.tar.gz"
-	cd "$TMP"
-	if [ ! -f $MW_FILENAME ] ; then
+	cd "$FILES_FOLDER_DOWNLOAD"
+	if ! test -f $MW_FILENAME
+	then
 		echo "Downloading $MW_VERSION_MAJOR.$MW_VERSION_MINOR sources ..."
 		wget "http://download.wikimedia.org/mediawiki/$MW_VERSION_MAJOR/$MW_FILENAME" ||
 			error "Unable to download "\
 			"http://download.wikimedia.org/mediawiki/$MW_VERSION_MAJOR/"\
 			"$MW_FILENAME. "\
 			"Please fix your connection and launch the script again."
-		echo "$MW_FILENAME downloaded in $(pwd). "\
-			"You can delete it later if you want."
+		echo "$MW_FILENAME downloaded in $(pwd)/;" \
+		     "you can delete it later if you want."
 	else
-		echo "Reusing existing $MW_FILENAME downloaded in $(pwd)."
+		echo "Reusing existing $MW_FILENAME downloaded in $(pwd)/"
 	fi
 	archive_abs_path=$(pwd)/$MW_FILENAME
 	cd "$WIKI_DIR_INST/$WIKI_DIR_NAME/" ||
@@ -352,48 +388,12 @@
 		error "Unable to extract WikiMedia's files from $archive_abs_path to "\
 			"$WIKI_DIR_INST/$WIKI_DIR_NAME"
 	) || exit 1
+	echo Extracted in "$WIKI_DIR_INST/$WIKI_DIR_NAME"
 
-	create_db
-
-	# Copy the generic LocalSettings.php in the web server's directory
-	# And modify parameters according to the ones set at the top
-	# of this script.
-	# Note that LocalSettings.php is never modified.
-	if [ ! -f "$FILES_FOLDER/LocalSettings.php" ] ; then
-		error "Can't find $FILES_FOLDER/LocalSettings.php " \
-			"in the current folder. "\
-		"Please run the script inside its folder."
-	fi
-	cp "$FILES_FOLDER/LocalSettings.php" \
-		"$FILES_FOLDER/LocalSettings-tmp.php" ||
-		error "Unable to copy $FILES_FOLDER/LocalSettings.php " \
-		"to $FILES_FOLDER/LocalSettings-tmp.php"
-
-	# Parse and set the LocalSettings file of the user according to the
-	# CONFIGURATION VARIABLES section at the beginning of this script
-	file_swap="$FILES_FOLDER/LocalSettings-swap.php"
-	sed "s,@WG_SCRIPT_PATH@,/$WIKI_DIR_NAME," \
-		"$FILES_FOLDER/LocalSettings-tmp.php" > "$file_swap"
-	mv "$file_swap" "$FILES_FOLDER/LocalSettings-tmp.php"
-	sed "s,@WG_SERVER@,http://$SERVER_ADDR," \
-		"$FILES_FOLDER/LocalSettings-tmp.php" > "$file_swap"
-	mv "$file_swap" "$FILES_FOLDER/LocalSettings-tmp.php"
-	sed "s,@WG_SQLITE_DATADIR@,$TMP," \
-		"$FILES_FOLDER/LocalSettings-tmp.php" > "$file_swap"
-	mv "$file_swap" "$FILES_FOLDER/LocalSettings-tmp.php"
-	sed "s,@WG_SQLITE_DATAFILE@,$( basename $DB_FILE .sqlite)," \
-		"$FILES_FOLDER/LocalSettings-tmp.php" > "$file_swap"
-	mv "$file_swap" "$FILES_FOLDER/LocalSettings-tmp.php"
-
-	mv "$FILES_FOLDER/LocalSettings-tmp.php" \
-		"$WIKI_DIR_INST/$WIKI_DIR_NAME/LocalSettings.php" ||
-		error "Unable to move $FILES_FOLDER/LocalSettings-tmp.php" \
-		"in $WIKI_DIR_INST/$WIKI_DIR_NAME"
-	echo "File $FILES_FOLDER/LocalSettings.php is set in" \
-		" $WIKI_DIR_INST/$WIKI_DIR_NAME"
+	install_mediawiki
 
 	echo "Your wiki has been installed. You can check it at
-		http://$SERVER_ADDR/$WIKI_DIR_NAME"
+		$WIKI_URL"
 }
 
 # Reset the database of the wiki and the password of the admin
@@ -401,12 +401,18 @@
 # Warning: This function must be called only in a subdirectory of t/ directory
 wiki_reset () {
 	# Copy initial database of the wiki
-	if [ ! -f "../$FILES_FOLDER/$DB_FILE" ] ; then
-		error "Can't find ../$FILES_FOLDER/$DB_FILE in the current folder."
+	if ! test -d "../$FILES_FOLDER_DB"
+	then
+		error "No wiki database at ../$FILES_FOLDER_DB, not installed yet?"
 	fi
-	cp "../$FILES_FOLDER/$DB_FILE" "$TMP" ||
-		error "Can't copy ../$FILES_FOLDER/$DB_FILE in $TMP"
-	echo "File $FILES_FOLDER/$DB_FILE is set in $TMP"
+	if ! test -d "../$FILES_FOLDER_POST_INSTALL_DB"
+	then
+		error "No wiki backup database at ../$FILES_FOLDER_POST_INSTALL_DB, failed installation?"
+	fi
+	wiki_delete_db
+	cp -R "../$FILES_FOLDER_POST_INSTALL_DB/"* "../$FILES_FOLDER_DB/" ||
+		error "Can't copy ../$FILES_FOLDER_POST_INSTALL_DB/* to ../$FILES_FOLDER_DB/*"
+	echo "File $FILES_FOLDER_DB/* has been reset"
 }
 
 # Delete the wiki created in the web server's directory and all its content
@@ -420,13 +426,7 @@
 		rm -rf "$WIKI_DIR_INST/$WIKI_DIR_NAME" ||
 			error "Wiki's directory $WIKI_DIR_INST/" \
 			"$WIKI_DIR_NAME could not be deleted"
-		# Delete the wiki's SQLite database.
-		rm -f "$TMP/$DB_FILE" ||
-			error "Database $TMP/$DB_FILE could not be deleted."
 	fi
-
-	# Delete the wiki's SQLite database
-	rm -f "$TMP/$DB_FILE" || error "Database $TMP/$DB_FILE could not be deleted."
-	rm -f "$FILES_FOLDER/$DB_FILE"
-	rm -rf "$TMP/mediawiki-$MW_VERSION_MAJOR.$MW_VERSION_MINOR.tar.gz"
+	wiki_delete_db
+	wiki_delete_db_backup
 }
diff --git a/contrib/mw-to-git/t/test-gitmw.pl b/contrib/mw-to-git/t/test-gitmw.pl
index 0ff7625..c5d687f 100755
--- a/contrib/mw-to-git/t/test-gitmw.pl
+++ b/contrib/mw-to-git/t/test-gitmw.pl
@@ -24,9 +24,7 @@
 
 use MediaWiki::API;
 use Getopt::Long;
-use encoding 'utf8';
 use DateTime::Format::ISO8601;
-use open ':encoding(utf8)';
 use constant SLASH_REPLACEMENT => "%2F";
 
 #Parsing of the config file
@@ -87,7 +85,7 @@
 	# Replace spaces by underscore in the page name
 	$pagename =~ s/ /_/g;
 	$pagename =~ s/\//%2F/g;
-	open(my $file, ">$destdir/$pagename.mw");
+	open(my $file, ">:encoding(UTF-8)", "$destdir/$pagename.mw");
 	print $file "$content";
 	close ($file);
 
@@ -172,7 +170,7 @@
 				cmlimit => 500 },
 		)
 		|| die $mw->{error}->{code}.": ".$mw->{error}->{details};
-		open(my $file, ">all.txt");
+		open(my $file, ">:encoding(UTF-8)", "all.txt");
 		foreach my $page (@{$mw_pages}) {
 			print $file "$page->{title}\n";
 		}
@@ -185,7 +183,7 @@
 				aplimit => 500,
 			})
 		|| die $mw->{error}->{code}.": ".$mw->{error}->{details};
-		open(my $file, ">all.txt");
+		open(my $file, ">:encoding(UTF-8)", "all.txt");
 		foreach my $page (@{$mw_pages}) {
 			print $file "$page->{title}\n";
 		}
@@ -214,12 +212,12 @@
 
 wiki_login($wiki_admin, $wiki_admin_pass);
 
-my %functions_to_call = qw(
-	upload_file    wiki_upload_file
-	get_page       wiki_getpage
-	delete_page    wiki_delete_page
-	edit_page      wiki_editpage
-	getallpagename wiki_getallpagename
+my %functions_to_call = (
+	upload_file    => \&wiki_upload_file,
+	get_page       => \&wiki_getpage,
+	delete_page    => \&wiki_delete_page,
+	edit_page      => \&wiki_editpage,
+	getallpagename => \&wiki_getallpagename,
 );
 die "$0 ERROR: wrong argument" unless exists $functions_to_call{$fct_to_call};
-&{$functions_to_call{$fct_to_call}}(@ARGV);
+$functions_to_call{$fct_to_call}->(map { utf8::decode($_); $_ } @ARGV);
diff --git a/contrib/mw-to-git/t/test.config b/contrib/mw-to-git/t/test.config
index 5ba0684..ed10b3e 100644
--- a/contrib/mw-to-git/t/test.config
+++ b/contrib/mw-to-git/t/test.config
@@ -3,15 +3,11 @@
 
 # Login and password of the wiki's admin
 WIKI_ADMIN=WikiAdmin
-WIKI_PASSW=AdminPass
+WIKI_PASSW=AdminPass1
 
 # Address of the web server
 SERVER_ADDR=localhost
 
-# SQLite database of the wiki, named DB_FILE, is located in TMP
-TMP=/tmp
-DB_FILE=wikidb.sqlite
-
 # If LIGHTTPD is not set to true, the script will use the default
 # web server running in WIKI_DIR_INST.
 WIKI_DIR_INST=/var/www
@@ -28,10 +24,17 @@
 WEB_TMP=$WEB/tmp
 WEB_WWW=$WEB/www
 
+# Where our configuration for the wiki is located
+FILES_FOLDER=mediawiki
+FILES_FOLDER_DOWNLOAD=$FILES_FOLDER/download
+FILES_FOLDER_DB=$FILES_FOLDER/db
+FILES_FOLDER_POST_INSTALL_DB=$FILES_FOLDER/post-install-db
+
 # The variables below are used by the script to install a wiki.
 # You should not modify these unless you are modifying the script itself.
-# tested versions: 1.19.X -> 1.21.1
-MW_VERSION_MAJOR=1.21
-MW_VERSION_MINOR=1
-FILES_FOLDER=install-wiki
-DB_INSTALL_SCRIPT=db_install.php
+# tested versions: 1.19.X -> 1.21.1 -> 1.34.2
+#
+# See https://www.mediawiki.org/wiki/Download for what the latest
+# version is.
+MW_VERSION_MAJOR=1.34
+MW_VERSION_MINOR=2
diff --git a/diff-lib.c b/diff-lib.c
index 5d5d3da..346fdcf 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -565,3 +565,28 @@
 	object_array_clear(&rev.pending);
 	return (rev.diffopt.flags.has_changes != 0);
 }
+
+static struct strbuf *idiff_prefix_cb(struct diff_options *opt, void *data)
+{
+	return data;
+}
+
+void show_interdiff(const struct object_id *oid1, const struct object_id *oid2,
+		    int indent, struct diff_options *diffopt)
+{
+	struct diff_options opts;
+	struct strbuf prefix = STRBUF_INIT;
+
+	memcpy(&opts, diffopt, sizeof(opts));
+	opts.output_format = DIFF_FORMAT_PATCH;
+	opts.output_prefix = idiff_prefix_cb;
+	strbuf_addchars(&prefix, ' ', indent);
+	opts.output_prefix_data = &prefix;
+	diff_setup_done(&opts);
+
+	diff_tree_oid(oid1, oid2, "", &opts);
+	diffcore_std(&opts);
+	diff_flush(&opts);
+
+	strbuf_release(&prefix);
+}
diff --git a/diff.c b/diff.c
index ee8e818..2bb2f8f 100644
--- a/diff.c
+++ b/diff.c
@@ -3663,7 +3663,7 @@
 {
 	mmfile_t mf1, mf2;
 	struct diffstat_file *data;
-	int same_contents;
+	int may_differ;
 	int complete_rewrite = 0;
 
 	if (!DIFF_PAIR_UNMERGED(p)) {
@@ -3681,12 +3681,14 @@
 		return;
 	}
 
-	same_contents = oideq(&one->oid, &two->oid);
+	/* saves some reads if true, not a guarantee of diff outcome */
+	may_differ = !(one->oid_valid && two->oid_valid &&
+			oideq(&one->oid, &two->oid));
 
 	if (diff_filespec_is_binary(o->repo, one) ||
 	    diff_filespec_is_binary(o->repo, two)) {
 		data->is_binary = 1;
-		if (same_contents) {
+		if (!may_differ) {
 			data->added = 0;
 			data->deleted = 0;
 		} else {
@@ -3702,7 +3704,7 @@
 		data->added = count_lines(two->data, two->size);
 	}
 
-	else if (!same_contents) {
+	else if (may_differ) {
 		/* Crazy xdl interfaces.. */
 		xpparam_t xpp;
 		xdemitconf_t xecfg;
@@ -3727,7 +3729,7 @@
 				diffstat->files[diffstat->nr - 1];
 			/*
 			 * Omit diffstats of modified files where nothing changed.
-			 * Even if !same_contents, this might be the case due to
+			 * Even if may_differ, this might be the case due to
 			 * ignoring whitespace changes, etc.
 			 *
 			 * But note that we special-case additions, deletions,
diff --git a/diff.h b/diff.h
index e0c0af6..3de3432 100644
--- a/diff.h
+++ b/diff.h
@@ -287,8 +287,6 @@
 
 	/* If non-zero, then stop computing after this many changes. */
 	int max_changes;
-	/* For internal use only. */
-	int num_changes;
 
 	int ita_invisible_in_index;
 /* white-space error highlighting */
@@ -601,6 +599,13 @@
 		       int ita_invisible_in_index);
 
 /*
+ * Emit an interdiff of two object ID's to 'diff_options.file' optionally
+ * indented by 'indent' spaces.
+ */
+void show_interdiff(const struct object_id *, const struct object_id *,
+		    int indent, struct diff_options *);
+
+/*
  * Fill the contents of the filespec "df", respecting any textconv defined by
  * its userdiff driver.  The "driver" parameter must come from a
  * previous call to get_textconv(), and therefore should either be NULL or have
diff --git a/fuzz-commit-graph.c b/fuzz-commit-graph.c
index 4308172..e7cf6d5 100644
--- a/fuzz-commit-graph.c
+++ b/fuzz-commit-graph.c
@@ -1,7 +1,8 @@
 #include "commit-graph.h"
 #include "repository.h"
 
-struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size);
+struct commit_graph *parse_commit_graph(struct repository *r,
+					void *graph_map, size_t graph_size);
 
 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
 
@@ -10,7 +11,7 @@
 	struct commit_graph *g;
 
 	initialize_the_repository();
-	g = parse_commit_graph((void *)data, size);
+	g = parse_commit_graph(the_repository, (void *)data, size);
 	repo_clear(the_repository);
 	free_commit_graph(g);
 
diff --git a/generate-cmdlist.sh b/generate-cmdlist.sh
index 45fecf8..9dbbb08 100755
--- a/generate-cmdlist.sh
+++ b/generate-cmdlist.sh
@@ -10,7 +10,7 @@
 }
 
 get_categories () {
-	tr ' ' '\n'|
+	tr ' ' '\012'|
 	grep -v '^$' |
 	sort |
 	uniq
diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index b6cdcfe..8a72018 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -754,13 +754,16 @@
 	my $head = { TEXT => [], DISPLAY => [], TYPE => 'header' };
 	my $mode = { TEXT => [], DISPLAY => [], TYPE => 'mode' };
 	my $deletion = { TEXT => [], DISPLAY => [], TYPE => 'deletion' };
-	my $addition = { TEXT => [], DISPLAY => [], TYPE => 'addition' };
+	my $addition;
 
 	for (my $i = 0; $i < @{$src->{TEXT}}; $i++) {
+		if ($src->{TEXT}->[$i] =~ /^new file/) {
+			$addition = 1;
+			$head->{TYPE} = 'addition';
+		}
 		my $dest =
 		   $src->{TEXT}->[$i] =~ /^(old|new) mode (\d+)$/ ? $mode :
 		   $src->{TEXT}->[$i] =~ /^deleted file/ ? $deletion :
-		   $src->{TEXT}->[$i] =~ /^new file/ ? $addition :
 		   $head;
 		push @{$dest->{TEXT}}, $src->{TEXT}->[$i];
 		push @{$dest->{DISPLAY}}, $src->{DISPLAY}->[$i];
@@ -1501,12 +1504,6 @@
 			push @{$deletion->{DISPLAY}}, @{$hunk->{DISPLAY}};
 		}
 		@hunk = ($deletion);
-	} elsif (@{$addition->{TEXT}}) {
-		foreach my $hunk (@hunk) {
-			push @{$addition->{TEXT}}, @{$hunk->{TEXT}};
-			push @{$addition->{DISPLAY}}, @{$hunk->{DISPLAY}};
-		}
-		@hunk = ($addition);
 	}
 
 	$num = scalar @hunk;
@@ -1516,6 +1513,7 @@
 		my ($prev, $next, $other, $undecided, $i);
 		$other = '';
 
+		last if ($ix and !$num);
 		if ($num <= $ix) {
 			$ix = 0;
 		}
@@ -1548,35 +1546,51 @@
 				last;
 			}
 		}
-		last if (!$undecided);
+		last if (!$undecided && ($num || !$addition));
 
-		if ($hunk[$ix]{TYPE} eq 'hunk' &&
-		    hunk_splittable($hunk[$ix]{TEXT})) {
-			$other .= ',s';
+		if ($num) {
+			if ($hunk[$ix]{TYPE} eq 'hunk' &&
+			    hunk_splittable($hunk[$ix]{TEXT})) {
+				$other .= ',s';
+			}
+			if ($hunk[$ix]{TYPE} eq 'hunk') {
+				$other .= ',e';
+			}
+			for (@{$hunk[$ix]{DISPLAY}}) {
+				print;
+			}
 		}
-		if ($hunk[$ix]{TYPE} eq 'hunk') {
-			$other .= ',e';
-		}
-		for (@{$hunk[$ix]{DISPLAY}}) {
-			print;
-		}
-		print colored $prompt_color, "(", ($ix+1), "/$num) ",
-			sprintf(__($patch_update_prompt_modes{$patch_mode}{$hunk[$ix]{TYPE}}), $other);
+		my $type = $num ? $hunk[$ix]{TYPE} : $head->{TYPE};
+		print colored $prompt_color, "(", ($ix+1), "/", ($num ? $num : 1), ") ",
+			sprintf(__($patch_update_prompt_modes{$patch_mode}{$type}), $other);
 
 		my $line = prompt_single_character;
 		last unless defined $line;
 		if ($line) {
 			if ($line =~ /^y/i) {
-				$hunk[$ix]{USE} = 1;
+				if ($num) {
+					$hunk[$ix]{USE} = 1;
+				} else {
+					$head->{USE} = 1;
+				}
 			}
 			elsif ($line =~ /^n/i) {
-				$hunk[$ix]{USE} = 0;
+				if ($num) {
+					$hunk[$ix]{USE} = 0;
+				} else {
+					$head->{USE} = 0;
+				}
 			}
 			elsif ($line =~ /^a/i) {
-				while ($ix < $num) {
-					if (!defined $hunk[$ix]{USE}) {
-						$hunk[$ix]{USE} = 1;
+				if ($num) {
+					while ($ix < $num) {
+						if (!defined $hunk[$ix]{USE}) {
+							$hunk[$ix]{USE} = 1;
+						}
+						$ix++;
 					}
+				} else {
+					$head->{USE} = 1;
 					$ix++;
 				}
 				next;
@@ -1613,19 +1627,28 @@
 				next;
 			}
 			elsif ($line =~ /^d/i) {
-				while ($ix < $num) {
-					if (!defined $hunk[$ix]{USE}) {
-						$hunk[$ix]{USE} = 0;
+				if ($num) {
+					while ($ix < $num) {
+						if (!defined $hunk[$ix]{USE}) {
+							$hunk[$ix]{USE} = 0;
+						}
+						$ix++;
 					}
+				} else {
+					$head->{USE} = 0;
 					$ix++;
 				}
 				next;
 			}
 			elsif ($line =~ /^q/i) {
-				for ($i = 0; $i < $num; $i++) {
-					if (!defined $hunk[$i]{USE}) {
-						$hunk[$i]{USE} = 0;
+				if ($num) {
+					for ($i = 0; $i < $num; $i++) {
+						if (!defined $hunk[$i]{USE}) {
+							$hunk[$i]{USE} = 0;
+						}
 					}
+				} elsif (!defined $head->{USE}) {
+					$head->{USE} = 0;
 				}
 				$quit = 1;
 				last;
@@ -1743,7 +1766,7 @@
 		}
 	}
 
-	@hunk = coalesce_overlapping_hunks(@hunk);
+	@hunk = coalesce_overlapping_hunks(@hunk) if ($num);
 
 	my $n_lofs = 0;
 	my @result = ();
@@ -1753,7 +1776,7 @@
 		}
 	}
 
-	if (@result) {
+	if (@result or $head->{USE}) {
 		my @patch = reassemble_patch($head->{TEXT}, @result);
 		my $apply_routine = $patch_mode_flavour{APPLY};
 		&$apply_routine(@patch);
diff --git a/git-bisect.sh b/git-bisect.sh
index 2f60fef..ea7e684 100755
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -49,27 +49,6 @@
 	fi
 }
 
-bisect_autostart() {
-	test -s "$GIT_DIR/BISECT_START" || {
-		gettextln "You need to start by \"git bisect start\"" >&2
-		if test -t 0
-		then
-			# TRANSLATORS: Make sure to include [Y] and [n] in your
-			# translation. The program will only accept English input
-			# at this point.
-			gettext "Do you want me to do it for you [Y/n]? " >&2
-			read yesno
-			case "$yesno" in
-			[Nn]*)
-				exit ;;
-			esac
-			bisect_start
-		else
-			exit 1
-		fi
-	}
-}
-
 bisect_start() {
 	git bisect--helper --bisect-start $@ || exit
 
@@ -86,8 +65,7 @@
 	#
 	# Check if we can proceed to the next bisect state.
 	#
-	get_terms
-	bisect_auto_next
+	git bisect--helper --bisect-auto-next || exit
 
 	trap '-' 0
 }
@@ -108,7 +86,7 @@
 }
 
 bisect_state() {
-	bisect_autostart
+	git bisect--helper --bisect-autostart || exit
 	state=$1
 	git bisect--helper --check-and-set-terms $state $TERM_GOOD $TERM_BAD || exit
 	get_terms
@@ -140,45 +118,7 @@
 	*)
 		usage ;;
 	esac
-	bisect_auto_next
-}
-
-bisect_auto_next() {
-	git bisect--helper --bisect-next-check $TERM_GOOD $TERM_BAD && bisect_next || :
-}
-
-bisect_next() {
-	case "$#" in 0) ;; *) usage ;; esac
-	bisect_autostart
-	git bisect--helper --bisect-next-check $TERM_GOOD $TERM_BAD $TERM_GOOD|| exit
-
-	# Perform all bisection computation, display and checkout
-	git bisect--helper --next-all
-	res=$?
-
-	# Check if we should exit because bisection is finished
-	if test $res -eq 10
-	then
-		bad_rev=$(git show-ref --hash --verify refs/bisect/$TERM_BAD)
-		bad_commit=$(git show-branch $bad_rev)
-		echo "# first $TERM_BAD commit: $bad_commit" >>"$GIT_DIR/BISECT_LOG"
-		exit 0
-	elif test $res -eq 2
-	then
-		echo "# only skipped commits left to test" >>"$GIT_DIR/BISECT_LOG"
-		good_revs=$(git for-each-ref --format="%(objectname)" "refs/bisect/$TERM_GOOD-*")
-		for skipped in $(git rev-list refs/bisect/$TERM_BAD --not $good_revs)
-		do
-			skipped_commit=$(git show-branch $skipped)
-			echo "# possible first $TERM_BAD commit: $skipped_commit" >>"$GIT_DIR/BISECT_LOG"
-		done
-		exit $res
-	fi
-
-	# Check for an error in the bisection process
-	test $res -ne 0 && exit $res
-
-	return 0
+	git bisect--helper --bisect-auto-next
 }
 
 bisect_visualize() {
@@ -234,7 +174,7 @@
 		esac
 	done <"$file"
 	IFS="$oIFS"
-	bisect_auto_next
+	git bisect--helper --bisect-auto-next || exit
 }
 
 bisect_run () {
@@ -331,7 +271,7 @@
 		bisect_skip "$@" ;;
 	next)
 		# Not sure we want "next" at the UI level anymore.
-		bisect_next "$@" ;;
+		git bisect--helper --bisect-next "$@" || exit ;;
 	visualize|view)
 		bisect_visualize "$@" ;;
 	reset)
diff --git a/git-p4.py b/git-p4.py
index ca79dc0..4433ca5 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -4237,7 +4237,7 @@
         """
 
         for parent in (range(65535)):
-            log = extractLogMessageFromGitCommit("{0}^{1}".format(starting_point, parent))
+            log = extractLogMessageFromGitCommit("{0}~{1}".format(starting_point, parent))
             settings = extractSettingsGitLog(log)
             if 'change' in settings:
                 return settings
diff --git a/git.c b/git.c
index 01c456e..f1e8b56 100644
--- a/git.c
+++ b/git.c
@@ -534,6 +534,7 @@
 	{ "ls-tree", cmd_ls_tree, RUN_SETUP },
 	{ "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY | NO_PARSEOPT },
 	{ "mailsplit", cmd_mailsplit, NO_PARSEOPT },
+	{ "maintenance", cmd_maintenance, RUN_SETUP_GENTLY | NO_PARSEOPT },
 	{ "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 	{ "merge-base", cmd_merge_base, RUN_SETUP },
 	{ "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
diff --git a/gitk-git/gitk b/gitk-git/gitk
index abe4805..23d9dd1 100755
--- a/gitk-git/gitk
+++ b/gitk-git/gitk
@@ -11,14 +11,14 @@
 
 proc hasworktree {} {
     return [expr {[exec git rev-parse --is-bare-repository] == "false" &&
-		  [exec git rev-parse --is-inside-git-dir] == "false"}]
+                  [exec git rev-parse --is-inside-git-dir] == "false"}]
 }
 
 proc reponame {} {
     global gitdir
     set n [file normalize $gitdir]
     if {[string match "*/.git" $n]} {
-	set n [string range $n 0 end-5]
+        set n [string range $n 0 end-5]
     }
     return [file tail $n]
 }
@@ -26,7 +26,7 @@
 proc gitworktree {} {
     variable _gitworktree
     if {[info exists _gitworktree]} {
-	return $_gitworktree
+        return $_gitworktree
     }
     # v1.7.0 introduced --show-toplevel to return the canonical work-tree
     if {[catch {set _gitworktree [exec git rev-parse --show-toplevel]}]} {
@@ -34,10 +34,9 @@
         # cdup to obtain a relative path to the top of the worktree. If
         # run from the top, the ./ prefix ensures normalize expands pwd.
         if {[catch { set _gitworktree $env(GIT_WORK_TREE) }]} {
-	    catch {set _gitworktree [exec git config --get core.worktree]}
-	    if {$_gitworktree eq ""} {
-		set _gitworktree [file normalize ./[exec git rev-parse --show-cdup]]
-	    }
+            if {[catch {set _gitworktree [exec git config --get core.worktree]}]} {
+                set _gitworktree [file normalize ./[exec git rev-parse --show-cdup]]
+            }
         }
     }
     return $_gitworktree
@@ -54,7 +53,7 @@
     set script $args
     if {[info exists isonrunq($script)]} return
     if {$runq eq {} && ![info exists currunq]} {
-	after idle dorunq
+        after idle dorunq
     }
     lappend runq [list {} $script]
     set isonrunq($script) 1
@@ -69,7 +68,7 @@
 
     fileevent $fd readable {}
     if {$runq eq {} && ![info exists currunq]} {
-	after idle dorunq
+        after idle dorunq
     }
     lappend runq [list $fd $script]
 }
@@ -78,11 +77,11 @@
     global runq
 
     for {set i 0} {$i < [llength $runq]} {} {
-	if {[lindex $runq $i 0] eq $fd} {
-	    set runq [lreplace $runq $i $i]
-	} else {
-	    incr i
-	}
+        if {[lindex $runq $i 0] eq $fd} {
+            set runq [lreplace $runq $i $i]
+        } else {
+            incr i
+        }
     }
 }
 
@@ -92,30 +91,30 @@
     set tstart [clock clicks -milliseconds]
     set t0 $tstart
     while {[llength $runq] > 0} {
-	set fd [lindex $runq 0 0]
-	set script [lindex $runq 0 1]
-	set currunq [lindex $runq 0]
-	set runq [lrange $runq 1 end]
-	set repeat [eval $script]
-	unset currunq
-	set t1 [clock clicks -milliseconds]
-	set t [expr {$t1 - $t0}]
-	if {$repeat ne {} && $repeat} {
-	    if {$fd eq {} || $repeat == 2} {
-		# script returns 1 if it wants to be readded
-		# file readers return 2 if they could do more straight away
-		lappend runq [list $fd $script]
-	    } else {
-		fileevent $fd readable [list filereadable $fd $script]
-	    }
-	} elseif {$fd eq {}} {
-	    unset isonrunq($script)
-	}
-	set t0 $t1
-	if {$t1 - $tstart >= 80} break
+        set fd [lindex $runq 0 0]
+        set script [lindex $runq 0 1]
+        set currunq [lindex $runq 0]
+        set runq [lrange $runq 1 end]
+        set repeat [eval $script]
+        unset currunq
+        set t1 [clock clicks -milliseconds]
+        set t [expr {$t1 - $t0}]
+        if {$repeat ne {} && $repeat} {
+            if {$fd eq {} || $repeat == 2} {
+                # script returns 1 if it wants to be readded
+                # file readers return 2 if they could do more straight away
+                lappend runq [list $fd $script]
+            } else {
+                fileevent $fd readable [list filereadable $fd $script]
+            }
+        } elseif {$fd eq {}} {
+            unset isonrunq($script)
+        }
+        set t0 $t1
+        if {$t1 - $tstart >= 80} break
     }
     if {$runq ne {}} {
-	after idle dorunq
+        after idle dorunq
     }
 }
 
@@ -135,20 +134,20 @@
     set mlist {}
     set nr_unmerged 0
     if {[catch {
-	set fd [open "| git ls-files -u" r]
+        set fd [open "| git ls-files -u" r]
     } err]} {
-	show_error {} . "[mc "Couldn't get list of unmerged files:"] $err"
-	exit 1
+        show_error {} . "[mc "Couldn't get list of unmerged files:"] $err"
+        exit 1
     }
     while {[gets $fd line] >= 0} {
-	set i [string first "\t" $line]
-	if {$i < 0} continue
-	set fname [string range $line [expr {$i+1}] end]
-	if {[lsearch -exact $mlist $fname] >= 0} continue
-	incr nr_unmerged
-	if {$files eq {} || [path_filter $files $fname]} {
-	    lappend mlist $fname
-	}
+        set i [string first "\t" $line]
+        if {$i < 0} continue
+        set fname [string range $line [expr {$i+1}] end]
+        if {[lsearch -exact $mlist $fname] >= 0} continue
+        incr nr_unmerged
+        if {$files eq {} || [path_filter $files $fname]} {
+            lappend mlist $fname
+        }
     }
     catch {close $fd}
     return $mlist
@@ -171,115 +170,115 @@
     set filtered 0
     set i -1
     foreach arg $arglist {
-	incr i
-	if {$nextisval} {
-	    lappend glflags $arg
-	    set nextisval 0
-	    continue
-	}
-	switch -glob -- $arg {
-	    "-d" -
-	    "--date-order" {
-		set vdatemode($n) 1
-		# remove from origargs in case we hit an unknown option
-		set origargs [lreplace $origargs $i $i]
-		incr i -1
-	    }
-	    "-[puabwcrRBMC]" -
-	    "--no-renames" - "--full-index" - "--binary" - "--abbrev=*" -
-	    "--find-copies-harder" - "-l*" - "--ext-diff" - "--no-ext-diff" -
-	    "--src-prefix=*" - "--dst-prefix=*" - "--no-prefix" -
-	    "-O*" - "--text" - "--full-diff" - "--ignore-space-at-eol" -
-	    "--ignore-space-change" - "-U*" - "--unified=*" {
-		# These request or affect diff output, which we don't want.
-		# Some could be used to set our defaults for diff display.
-		lappend diffargs $arg
-	    }
-	    "--raw" - "--patch-with-raw" - "--patch-with-stat" -
-	    "--name-only" - "--name-status" - "--color" -
-	    "--log-size" - "--pretty=*" - "--decorate" - "--abbrev-commit" -
-	    "--cc" - "-z" - "--header" - "--parents" - "--boundary" -
-	    "--no-color" - "-g" - "--walk-reflogs" - "--no-walk" -
-	    "--timestamp" - "relative-date" - "--date=*" - "--stdin" -
-	    "--objects" - "--objects-edge" - "--reverse" {
-		# These cause our parsing of git log's output to fail, or else
-		# they're options we want to set ourselves, so ignore them.
-	    }
-	    "--color-words*" - "--word-diff=color" {
-		# These trigger a word diff in the console interface,
-		# so help the user by enabling our own support
-		if {[package vcompare $git_version "1.7.2"] >= 0} {
-		    set worddiff [mc "Color words"]
-		}
-	    }
-	    "--word-diff*" {
-		if {[package vcompare $git_version "1.7.2"] >= 0} {
-		    set worddiff [mc "Markup words"]
-		}
-	    }
-	    "--stat=*" - "--numstat" - "--shortstat" - "--summary" -
-	    "--check" - "--exit-code" - "--quiet" - "--topo-order" -
-	    "--full-history" - "--dense" - "--sparse" -
-	    "--follow" - "--left-right" - "--encoding=*" {
-		# These are harmless, and some are even useful
-		lappend glflags $arg
-	    }
-	    "--diff-filter=*" - "--no-merges" - "--unpacked" -
-	    "--max-count=*" - "--skip=*" - "--since=*" - "--after=*" -
-	    "--until=*" - "--before=*" - "--max-age=*" - "--min-age=*" -
-	    "--author=*" - "--committer=*" - "--grep=*" - "-[iE]" -
-	    "--remove-empty" - "--first-parent" - "--cherry-pick" -
-	    "-S*" - "-G*" - "--pickaxe-all" - "--pickaxe-regex" -
-	    "--simplify-by-decoration" {
-		# These mean that we get a subset of the commits
-		set filtered 1
-		lappend glflags $arg
-	    }
-	    "-L*" {
-		# Line-log with 'stuck' argument (unstuck form is
-		# not supported)
-		set filtered 1
-		set vinlinediff($n) 1
-		set allknown 0
-		lappend glflags $arg
-	    }
-	    "-n" {
-		# This appears to be the only one that has a value as a
-		# separate word following it
-		set filtered 1
-		set nextisval 1
-		lappend glflags $arg
-	    }
-	    "--not" - "--all" {
-		lappend revargs $arg
-	    }
-	    "--merge" {
-		set vmergeonly($n) 1
-		# git rev-parse doesn't understand --merge
-		lappend revargs --gitk-symmetric-diff-marker MERGE_HEAD...HEAD
-	    }
-	    "--no-replace-objects" {
-		set env(GIT_NO_REPLACE_OBJECTS) "1"
-	    }
-	    "-*" {
-		# Other flag arguments including -<n>
-		if {[string is digit -strict [string range $arg 1 end]]} {
-		    set filtered 1
-		} else {
-		    # a flag argument that we don't recognize;
-		    # that means we can't optimize
-		    set allknown 0
-		}
-		lappend glflags $arg
-	    }
-	    default {
-		# Non-flag arguments specify commits or ranges of commits
-		if {[string match "*...*" $arg]} {
-		    lappend revargs --gitk-symmetric-diff-marker
-		}
-		lappend revargs $arg
-	    }
-	}
+        incr i
+        if {$nextisval} {
+            lappend glflags $arg
+            set nextisval 0
+            continue
+        }
+        switch -glob -- $arg {
+            "-d" -
+            "--date-order" {
+                set vdatemode($n) 1
+                # remove from origargs in case we hit an unknown option
+                set origargs [lreplace $origargs $i $i]
+                incr i -1
+            }
+            "-[puabwcrRBMC]" -
+            "--no-renames" - "--full-index" - "--binary" - "--abbrev=*" -
+            "--find-copies-harder" - "-l*" - "--ext-diff" - "--no-ext-diff" -
+            "--src-prefix=*" - "--dst-prefix=*" - "--no-prefix" -
+            "-O*" - "--text" - "--full-diff" - "--ignore-space-at-eol" -
+            "--ignore-space-change" - "-U*" - "--unified=*" {
+                # These request or affect diff output, which we don't want.
+                # Some could be used to set our defaults for diff display.
+                lappend diffargs $arg
+            }
+            "--raw" - "--patch-with-raw" - "--patch-with-stat" -
+            "--name-only" - "--name-status" - "--color" -
+            "--log-size" - "--pretty=*" - "--decorate" - "--abbrev-commit" -
+            "--cc" - "-z" - "--header" - "--parents" - "--boundary" -
+            "--no-color" - "-g" - "--walk-reflogs" - "--no-walk" -
+            "--timestamp" - "relative-date" - "--date=*" - "--stdin" -
+            "--objects" - "--objects-edge" - "--reverse" {
+                # These cause our parsing of git log's output to fail, or else
+                # they're options we want to set ourselves, so ignore them.
+            }
+            "--color-words*" - "--word-diff=color" {
+                # These trigger a word diff in the console interface,
+                # so help the user by enabling our own support
+                if {[package vcompare $git_version "1.7.2"] >= 0} {
+                    set worddiff [mc "Color words"]
+                }
+            }
+            "--word-diff*" {
+                if {[package vcompare $git_version "1.7.2"] >= 0} {
+                    set worddiff [mc "Markup words"]
+                }
+            }
+            "--stat=*" - "--numstat" - "--shortstat" - "--summary" -
+            "--check" - "--exit-code" - "--quiet" - "--topo-order" -
+            "--full-history" - "--dense" - "--sparse" -
+            "--follow" - "--left-right" - "--encoding=*" {
+                # These are harmless, and some are even useful
+                lappend glflags $arg
+            }
+            "--diff-filter=*" - "--no-merges" - "--unpacked" -
+            "--max-count=*" - "--skip=*" - "--since=*" - "--after=*" -
+            "--until=*" - "--before=*" - "--max-age=*" - "--min-age=*" -
+            "--author=*" - "--committer=*" - "--grep=*" - "-[iE]" -
+            "--remove-empty" - "--first-parent" - "--cherry-pick" -
+            "-S*" - "-G*" - "--pickaxe-all" - "--pickaxe-regex" -
+            "--simplify-by-decoration" {
+                # These mean that we get a subset of the commits
+                set filtered 1
+                lappend glflags $arg
+            }
+            "-L*" {
+                # Line-log with 'stuck' argument (unstuck form is
+                # not supported)
+                set filtered 1
+                set vinlinediff($n) 1
+                set allknown 0
+                lappend glflags $arg
+            }
+            "-n" {
+                # This appears to be the only one that has a value as a
+                # separate word following it
+                set filtered 1
+                set nextisval 1
+                lappend glflags $arg
+            }
+            "--not" - "--all" {
+                lappend revargs $arg
+            }
+            "--merge" {
+                set vmergeonly($n) 1
+                # git rev-parse doesn't understand --merge
+                lappend revargs --gitk-symmetric-diff-marker MERGE_HEAD...HEAD
+            }
+            "--no-replace-objects" {
+                set env(GIT_NO_REPLACE_OBJECTS) "1"
+            }
+            "-*" {
+                # Other flag arguments including -<n>
+                if {[string is digit -strict [string range $arg 1 end]]} {
+                    set filtered 1
+                } else {
+                    # a flag argument that we don't recognize;
+                    # that means we can't optimize
+                    set allknown 0
+                }
+                lappend glflags $arg
+            }
+            default {
+                # Non-flag arguments specify commits or ranges of commits
+                if {[string match "*...*" $arg]} {
+                    lappend revargs --gitk-symmetric-diff-marker
+                }
+                lappend revargs $arg
+            }
+        }
     }
     set vdflags($n) $diffargs
     set vflags($n) $glflags
@@ -293,61 +292,61 @@
     global vposids vnegids
 
     if {$revs eq {}} {
-	set revs HEAD
+        set revs HEAD
     } elseif {[lsearch -exact $revs --all] >= 0} {
-	lappend revs HEAD
+        lappend revs HEAD
     }
     if {[catch {set ids [eval exec git rev-parse $revs]} err]} {
-	# we get stdout followed by stderr in $err
-	# for an unknown rev, git rev-parse echoes it and then errors out
-	set errlines [split $err "\n"]
-	set badrev {}
-	for {set l 0} {$l < [llength $errlines]} {incr l} {
-	    set line [lindex $errlines $l]
-	    if {!([string length $line] == 40 && [string is xdigit $line])} {
-		if {[string match "fatal:*" $line]} {
-		    if {[string match "fatal: ambiguous argument*" $line]
-			&& $badrev ne {}} {
-			if {[llength $badrev] == 1} {
-			    set err "unknown revision $badrev"
-			} else {
-			    set err "unknown revisions: [join $badrev ", "]"
-			}
-		    } else {
-			set err [join [lrange $errlines $l end] "\n"]
-		    }
-		    break
-		}
-		lappend badrev $line
-	    }
-	}
-	error_popup "[mc "Error parsing revisions:"] $err"
-	return {}
+        # we get stdout followed by stderr in $err
+        # for an unknown rev, git rev-parse echoes it and then errors out
+        set errlines [split $err "\n"]
+        set badrev {}
+        for {set l 0} {$l < [llength $errlines]} {incr l} {
+            set line [lindex $errlines $l]
+            if {!([string length $line] == 40 && [string is xdigit $line])} {
+                if {[string match "fatal:*" $line]} {
+                    if {[string match "fatal: ambiguous argument*" $line]
+                        && $badrev ne {}} {
+                        if {[llength $badrev] == 1} {
+                            set err "unknown revision $badrev"
+                        } else {
+                            set err "unknown revisions: [join $badrev ", "]"
+                        }
+                    } else {
+                        set err [join [lrange $errlines $l end] "\n"]
+                    }
+                    break
+                }
+                lappend badrev $line
+            }
+        }
+        error_popup "[mc "Error parsing revisions:"] $err"
+        return {}
     }
     set ret {}
     set pos {}
     set neg {}
     set sdm 0
     foreach id [split $ids "\n"] {
-	if {$id eq "--gitk-symmetric-diff-marker"} {
-	    set sdm 4
-	} elseif {[string match "^*" $id]} {
-	    if {$sdm != 1} {
-		lappend ret $id
-		if {$sdm == 3} {
-		    set sdm 0
-		}
-	    }
-	    lappend neg [string range $id 1 end]
-	} else {
-	    if {$sdm != 2} {
-		lappend ret $id
-	    } else {
-		lset ret end $id...[lindex $ret end]
-	    }
-	    lappend pos $id
-	}
-	incr sdm -1
+        if {$id eq "--gitk-symmetric-diff-marker"} {
+            set sdm 4
+        } elseif {[string match "^*" $id]} {
+            if {$sdm != 1} {
+                lappend ret $id
+                if {$sdm == 3} {
+                    set sdm 0
+                }
+            }
+            lappend neg [string range $id 1 end]
+        } else {
+            if {$sdm != 2} {
+                lappend ret $id
+            } else {
+                lset ret end $id...[lindex $ret end]
+            }
+            lappend pos $id
+        }
+        incr sdm -1
     }
     set vposids($view) $pos
     set vnegids($view) $neg
@@ -374,63 +373,63 @@
 
     set args $viewargs($view)
     if {$viewargscmd($view) ne {}} {
-	if {[catch {
-	    set str [exec sh -c $viewargscmd($view)]
-	} err]} {
-	    error_popup "[mc "Error executing --argscmd command:"] $err"
-	    return 0
-	}
-	set args [concat $args [split $str "\n"]]
+        if {[catch {
+            set str [exec sh -c $viewargscmd($view)]
+        } err]} {
+            error_popup "[mc "Error executing --argscmd command:"] $err"
+            return 0
+        }
+        set args [concat $args [split $str "\n"]]
     }
     set vcanopt($view) [parseviewargs $view $args]
 
     set files $viewfiles($view)
     if {$vmergeonly($view)} {
-	set files [unmerged_files $files]
-	if {$files eq {}} {
-	    global nr_unmerged
-	    if {$nr_unmerged == 0} {
-		error_popup [mc "No files selected: --merge specified but\
-			     no files are unmerged."]
-	    } else {
-		error_popup [mc "No files selected: --merge specified but\
-			     no unmerged files are within file limit."]
-	    }
-	    return 0
-	}
+        set files [unmerged_files $files]
+        if {$files eq {}} {
+            global nr_unmerged
+            if {$nr_unmerged == 0} {
+                error_popup [mc "No files selected: --merge specified but\
+                             no files are unmerged."]
+            } else {
+                error_popup [mc "No files selected: --merge specified but\
+                             no unmerged files are within file limit."]
+            }
+            return 0
+        }
     }
     set vfilelimit($view) $files
 
     if {$vcanopt($view)} {
-	set revs [parseviewrevs $view $vrevs($view)]
-	if {$revs eq {}} {
-	    return 0
-	}
-	set args [concat $vflags($view) $revs]
+        set revs [parseviewrevs $view $vrevs($view)]
+        if {$revs eq {}} {
+            return 0
+        }
+        set args [concat $vflags($view) $revs]
     } else {
-	set args $vorigargs($view)
+        set args $vorigargs($view)
     }
 
     if {[catch {
-	set fd [open [concat | git log --no-color -z --pretty=raw $show_notes \
-			--parents --boundary $args "--" $files] r]
+        set fd [open [concat | git log --no-color -z --pretty=raw $show_notes \
+                        --parents --boundary $args "--" $files] r]
     } err]} {
-	error_popup "[mc "Error executing git log:"] $err"
-	return 0
+        error_popup "[mc "Error executing git log:"] $err"
+        return 0
     }
     set i [reg_instance $fd]
     set viewinstances($view) [list $i]
     set viewmainheadid($view) $mainheadid
     set viewmainheadid_orig($view) $mainheadid
     if {$files ne {} && $mainheadid ne {}} {
-	get_viewmainhead $view
+        get_viewmainhead $view
     }
     if {$showlocalchanges && $viewmainheadid($view) ne {}} {
-	interestedin $viewmainheadid($view) dodiffindex
+        interestedin $viewmainheadid($view) dodiffindex
     }
     fconfigure $fd -blocking 0 -translation lf -eofchar {}
     if {$tclencoding != {}} {
-	fconfigure $fd -encoding $tclencoding
+        fconfigure $fd -encoding $tclencoding
     }
     filerun $fd [list getcommitlines $fd $i $view 0]
     nowbusy $view [mc "Reading"]
@@ -444,13 +443,13 @@
 
     set fd $commfd($inst)
     catch {
-	set pid [pid $fd]
+        set pid [pid $fd]
 
-	if {$::tcl_platform(platform) eq {windows}} {
-	    exec taskkill /pid $pid
-	} else {
-	    exec kill $pid
-	}
+        if {$::tcl_platform(platform) eq {windows}} {
+            exec taskkill /pid $pid
+        } else {
+            exec kill $pid
+        }
     }
     catch {close $fd}
     nukefile $fd
@@ -462,7 +461,7 @@
     global commfd
 
     foreach inst [array names commfd] {
-	stop_instance $inst
+        stop_instance $inst
     }
 }
 
@@ -470,7 +469,7 @@
     global viewinstances
 
     foreach inst $viewinstances($view) {
-	stop_instance $inst
+        stop_instance $inst
     }
     set viewinstances($view) {}
 }
@@ -479,11 +478,11 @@
     global pending_select mainheadid selectheadid
 
     if {$selid ne {}} {
-	set pending_select $selid
+        set pending_select $selid
     } elseif {$selectheadid ne {}} {
-	set pending_select $selectheadid
+        set pending_select $selectheadid
     } else {
-	set pending_select $mainheadid
+        set pending_select $mainheadid
     }
 }
 
@@ -492,11 +491,11 @@
 
     initlayout
     if {[start_rev_list $curview]} {
-	reset_pending_select $selid
-	show_status [mc "Reading commits..."]
-	set need_redisplay 1
+        reset_pending_select $selid
+        show_status [mc "Reading commits..."]
+        set need_redisplay 1
     } else {
-	show_status [mc "No commits selected"]
+        show_status [mc "No commits selected"]
     }
 }
 
@@ -513,67 +512,67 @@
     rereadrefs
     set view $curview
     if {$mainheadid ne $viewmainheadid_orig($view)} {
-	if {$showlocalchanges} {
-	    dohidelocalchanges
-	}
-	set viewmainheadid($view) $mainheadid
-	set viewmainheadid_orig($view) $mainheadid
-	if {$vfilelimit($view) ne {}} {
-	    get_viewmainhead $view
-	}
+        if {$showlocalchanges} {
+            dohidelocalchanges
+        }
+        set viewmainheadid($view) $mainheadid
+        set viewmainheadid_orig($view) $mainheadid
+        if {$vfilelimit($view) ne {}} {
+            get_viewmainhead $view
+        }
     }
     if {$showlocalchanges} {
-	doshowlocalchanges
+        doshowlocalchanges
     }
     if {$vcanopt($view)} {
-	set oldpos $vposids($view)
-	set oldneg $vnegids($view)
-	set revs [parseviewrevs $view $vrevs($view)]
-	if {$revs eq {}} {
-	    return
-	}
-	# note: getting the delta when negative refs change is hard,
-	# and could require multiple git log invocations, so in that
-	# case we ask git log for all the commits (not just the delta)
-	if {$oldneg eq $vnegids($view)} {
-	    set newrevs {}
-	    set npos 0
-	    # take out positive refs that we asked for before or
-	    # that we have already seen
-	    foreach rev $revs {
-		if {[string length $rev] == 40} {
-		    if {[lsearch -exact $oldpos $rev] < 0
-			&& ![info exists varcid($view,$rev)]} {
-			lappend newrevs $rev
-			incr npos
-		    }
-		} else {
-		    lappend $newrevs $rev
-		}
-	    }
-	    if {$npos == 0} return
-	    set revs $newrevs
-	    set vposids($view) [lsort -unique [concat $oldpos $vposids($view)]]
-	}
-	set args [concat $vflags($view) $revs --not $oldpos]
+        set oldpos $vposids($view)
+        set oldneg $vnegids($view)
+        set revs [parseviewrevs $view $vrevs($view)]
+        if {$revs eq {}} {
+            return
+        }
+        # note: getting the delta when negative refs change is hard,
+        # and could require multiple git log invocations, so in that
+        # case we ask git log for all the commits (not just the delta)
+        if {$oldneg eq $vnegids($view)} {
+            set newrevs {}
+            set npos 0
+            # take out positive refs that we asked for before or
+            # that we have already seen
+            foreach rev $revs {
+                if {[string length $rev] == 40} {
+                    if {[lsearch -exact $oldpos $rev] < 0
+                        && ![info exists varcid($view,$rev)]} {
+                        lappend newrevs $rev
+                        incr npos
+                    }
+                } else {
+                    lappend $newrevs $rev
+                }
+            }
+            if {$npos == 0} return
+            set revs $newrevs
+            set vposids($view) [lsort -unique [concat $oldpos $vposids($view)]]
+        }
+        set args [concat $vflags($view) $revs --not $oldpos]
     } else {
-	set args $vorigargs($view)
+        set args $vorigargs($view)
     }
     if {[catch {
-	set fd [open [concat | git log --no-color -z --pretty=raw $show_notes \
-			--parents --boundary $args "--" $vfilelimit($view)] r]
+        set fd [open [concat | git log --no-color -z --pretty=raw $show_notes \
+                        --parents --boundary $args "--" $vfilelimit($view)] r]
     } err]} {
-	error_popup "[mc "Error executing git log:"] $err"
-	return
+        error_popup "[mc "Error executing git log:"] $err"
+        return
     }
     if {$viewactive($view) == 0} {
-	set startmsecs [clock clicks -milliseconds]
+        set startmsecs [clock clicks -milliseconds]
     }
     set i [reg_instance $fd]
     lappend viewinstances($view) $i
     fconfigure $fd -blocking 0 -translation lf -eofchar {}
     if {$tclencoding != {}} {
-	fconfigure $fd -encoding $tclencoding
+        fconfigure $fd -encoding $tclencoding
     }
     filerun $fd [list getcommitlines $fd $i $view 1]
     incr viewactive($view)
@@ -581,7 +580,7 @@
     reset_pending_select {}
     nowbusy $view [mc "Reading"]
     if {$showneartags} {
-	getallcommits
+        getallcommits
     }
 }
 
@@ -592,11 +591,11 @@
 
     set selid {}
     if {$selectedline ne {}} {
-	set selid $currentid
+        set selid $currentid
     }
 
     if {!$viewcomplete($curview)} {
-	stop_rev_list $curview
+        stop_rev_list $curview
     }
     resetvarcs $curview
     set selectedline {}
@@ -606,7 +605,7 @@
     readrefs
     changedrefs
     if {$showneartags} {
-	getallcommits
+        getallcommits
     }
     clear_display
     unset -nocomplain commitinfo
@@ -622,11 +621,11 @@
 # sorts as a string in numerical order
 proc strrep {n} {
     if {$n < 16} {
-	return [format "%x" $n]
+        return [format "%x" $n]
     } elseif {$n < 256} {
-	return [format "x%.2x" $n]
+        return [format "x%.2x" $n]
     } elseif {$n < 65536} {
-	return [format "y%.4x" $n]
+        return [format "y%.4x" $n]
     }
     return [format "z%.8x" $n]
 }
@@ -657,22 +656,22 @@
     global vshortids
 
     foreach vid [array names varcid $view,*] {
-	unset varcid($vid)
-	unset children($vid)
-	unset parents($vid)
+        unset varcid($vid)
+        unset children($vid)
+        unset parents($vid)
     }
     foreach vid [array names vshortids $view,*] {
-	unset vshortids($vid)
+        unset vshortids($vid)
     }
     # some commits might have children but haven't been seen yet
     foreach vid [array names children $view,*] {
-	unset children($vid)
+        unset children($vid)
     }
     foreach va [array names varccommits $view,*] {
-	unset varccommits($va)
+        unset varccommits($va)
     }
     foreach vd [array names vseedcount $view,*] {
-	unset vseedcount($vd)
+        unset vseedcount($vd)
     }
     unset -nocomplain ordertok
 }
@@ -684,8 +683,8 @@
     set ret {}
     set a [lindex $vdownptr($v) 0]
     while {$a != 0} {
-	lappend ret [lindex $varcstart($v) $a]
-	set a [lindex $vleftptr($v) $a]
+        lappend ret [lindex $varcstart($v) $a]
+        set a [lindex $vleftptr($v) $a]
     }
     return $ret
 }
@@ -698,60 +697,60 @@
     set a [llength $varctok($view)]
     set vid $view,$id
     if {[llength $children($vid)] == 0 || $vdatemode($view)} {
-	if {![info exists commitinfo($id)]} {
-	    parsecommit $id $commitdata($id) 1
-	}
-	set cdate [lindex [lindex $commitinfo($id) 4] 0]
-	if {![string is integer -strict $cdate]} {
-	    set cdate 0
-	}
-	if {![info exists vseedcount($view,$cdate)]} {
-	    set vseedcount($view,$cdate) -1
-	}
-	set c [incr vseedcount($view,$cdate)]
-	set cdate [expr {$cdate ^ 0xffffffff}]
-	set tok "s[strrep $cdate][strrep $c]"
+        if {![info exists commitinfo($id)]} {
+            parsecommit $id $commitdata($id) 1
+        }
+        set cdate [lindex [lindex $commitinfo($id) 4] 0]
+        if {![string is integer -strict $cdate]} {
+            set cdate 0
+        }
+        if {![info exists vseedcount($view,$cdate)]} {
+            set vseedcount($view,$cdate) -1
+        }
+        set c [incr vseedcount($view,$cdate)]
+        set cdate [expr {$cdate ^ 0xffffffff}]
+        set tok "s[strrep $cdate][strrep $c]"
     } else {
-	set tok {}
+        set tok {}
     }
     set ka 0
     if {[llength $children($vid)] > 0} {
-	set kid [lindex $children($vid) end]
-	set k $varcid($view,$kid)
-	if {[string compare [lindex $varctok($view) $k] $tok] > 0} {
-	    set ki $kid
-	    set ka $k
-	    set tok [lindex $varctok($view) $k]
-	}
+        set kid [lindex $children($vid) end]
+        set k $varcid($view,$kid)
+        if {[string compare [lindex $varctok($view) $k] $tok] > 0} {
+            set ki $kid
+            set ka $k
+            set tok [lindex $varctok($view) $k]
+        }
     }
     if {$ka != 0} {
-	set i [lsearch -exact $parents($view,$ki) $id]
-	set j [expr {[llength $parents($view,$ki)] - 1 - $i}]
-	append tok [strrep $j]
+        set i [lsearch -exact $parents($view,$ki) $id]
+        set j [expr {[llength $parents($view,$ki)] - 1 - $i}]
+        append tok [strrep $j]
     }
     set c [lindex $vlastins($view) $ka]
     if {$c == 0 || [string compare $tok [lindex $varctok($view) $c]] < 0} {
-	set c $ka
-	set b [lindex $vdownptr($view) $ka]
+        set c $ka
+        set b [lindex $vdownptr($view) $ka]
     } else {
-	set b [lindex $vleftptr($view) $c]
+        set b [lindex $vleftptr($view) $c]
     }
     while {$b != 0 && [string compare $tok [lindex $varctok($view) $b]] >= 0} {
-	set c $b
-	set b [lindex $vleftptr($view) $c]
+        set c $b
+        set b [lindex $vleftptr($view) $c]
     }
     if {$c == $ka} {
-	lset vdownptr($view) $ka $a
-	lappend vbackptr($view) 0
+        lset vdownptr($view) $ka $a
+        lappend vbackptr($view) 0
     } else {
-	lset vleftptr($view) $c $a
-	lappend vbackptr($view) $c
+        lset vleftptr($view) $c $a
+        lappend vbackptr($view) $c
     }
     lset vlastins($view) $ka $a
     lappend vupptr($view) $ka
     lappend vleftptr($view) $b
     if {$b != 0} {
-	lset vbackptr($view) $b $a
+        lset vbackptr($view) $b $a
     }
     lappend varctok($view) $tok
     lappend varcstart($view) $id
@@ -782,7 +781,7 @@
     set varccommits($v,$na) [lrange $ac $i end]
     lappend varcstart($v) $p
     foreach id $varccommits($v,$na) {
-	set varcid($v,$id) $na
+        set varcid($v,$id) $na
     }
     lappend vdownptr($v) [lindex $vdownptr($v) $oa]
     lappend vlastins($v) [lindex $vlastins($v) $oa]
@@ -792,10 +791,10 @@
     lappend vleftptr($v) 0
     lappend vbackptr($v) 0
     for {set b [lindex $vdownptr($v) $na]} {$b != 0} {set b [lindex $vleftptr($v) $b]} {
-	lset vupptr($v) $b $na
+        lset vupptr($v) $b $na
     }
     if {[string compare $otok $vtokmod($v)] <= 0} {
-	modify_arc $v $oa
+        modify_arc $v $oa
     }
 }
 
@@ -809,120 +808,120 @@
     set kidchanged($a) 1
     set ntot 0
     while {$a != 0} {
-	if {[info exists isrelated($a)]} {
-	    lappend todo $a
-	    set id [lindex $varccommits($v,$a) end]
-	    foreach p $parents($v,$id) {
-		if {[info exists varcid($v,$p)]} {
-		    set isrelated($varcid($v,$p)) 1
-		}
-	    }
-	}
-	incr ntot
-	set b [lindex $vdownptr($v) $a]
-	if {$b == 0} {
-	    while {$a != 0} {
-		set b [lindex $vleftptr($v) $a]
-		if {$b != 0} break
-		set a [lindex $vupptr($v) $a]
-	    }
-	}
-	set a $b
+        if {[info exists isrelated($a)]} {
+            lappend todo $a
+            set id [lindex $varccommits($v,$a) end]
+            foreach p $parents($v,$id) {
+                if {[info exists varcid($v,$p)]} {
+                    set isrelated($varcid($v,$p)) 1
+                }
+            }
+        }
+        incr ntot
+        set b [lindex $vdownptr($v) $a]
+        if {$b == 0} {
+            while {$a != 0} {
+                set b [lindex $vleftptr($v) $a]
+                if {$b != 0} break
+                set a [lindex $vupptr($v) $a]
+            }
+        }
+        set a $b
     }
     foreach a $todo {
-	if {![info exists kidchanged($a)]} continue
-	set id [lindex $varcstart($v) $a]
-	if {[llength $children($v,$id)] > 1} {
-	    set children($v,$id) [lsort -command [list vtokcmp $v] \
-				      $children($v,$id)]
-	}
-	set oldtok [lindex $varctok($v) $a]
-	if {!$vdatemode($v)} {
-	    set tok {}
-	} else {
-	    set tok $oldtok
-	}
-	set ka 0
-	set kid [last_real_child $v,$id]
-	if {$kid ne {}} {
-	    set k $varcid($v,$kid)
-	    if {[string compare [lindex $varctok($v) $k] $tok] > 0} {
-		set ki $kid
-		set ka $k
-		set tok [lindex $varctok($v) $k]
-	    }
-	}
-	if {$ka != 0} {
-	    set i [lsearch -exact $parents($v,$ki) $id]
-	    set j [expr {[llength $parents($v,$ki)] - 1 - $i}]
-	    append tok [strrep $j]
-	}
-	if {$tok eq $oldtok} {
-	    continue
-	}
-	set id [lindex $varccommits($v,$a) end]
-	foreach p $parents($v,$id) {
-	    if {[info exists varcid($v,$p)]} {
-		set kidchanged($varcid($v,$p)) 1
-	    } else {
-		set sortkids($p) 1
-	    }
-	}
-	lset varctok($v) $a $tok
-	set b [lindex $vupptr($v) $a]
-	if {$b != $ka} {
-	    if {[string compare [lindex $varctok($v) $ka] $vtokmod($v)] < 0} {
-		modify_arc $v $ka
-	    }
-	    if {[string compare [lindex $varctok($v) $b] $vtokmod($v)] < 0} {
-		modify_arc $v $b
-	    }
-	    set c [lindex $vbackptr($v) $a]
-	    set d [lindex $vleftptr($v) $a]
-	    if {$c == 0} {
-		lset vdownptr($v) $b $d
-	    } else {
-		lset vleftptr($v) $c $d
-	    }
-	    if {$d != 0} {
-		lset vbackptr($v) $d $c
-	    }
-	    if {[lindex $vlastins($v) $b] == $a} {
-		lset vlastins($v) $b $c
-	    }
-	    lset vupptr($v) $a $ka
-	    set c [lindex $vlastins($v) $ka]
-	    if {$c == 0 || \
-		    [string compare $tok [lindex $varctok($v) $c]] < 0} {
-		set c $ka
-		set b [lindex $vdownptr($v) $ka]
-	    } else {
-		set b [lindex $vleftptr($v) $c]
-	    }
-	    while {$b != 0 && \
-		      [string compare $tok [lindex $varctok($v) $b]] >= 0} {
-		set c $b
-		set b [lindex $vleftptr($v) $c]
-	    }
-	    if {$c == $ka} {
- 		lset vdownptr($v) $ka $a
-		lset vbackptr($v) $a 0
-	    } else {
-		lset vleftptr($v) $c $a
-		lset vbackptr($v) $a $c
-	    }
-	    lset vleftptr($v) $a $b
-	    if {$b != 0} {
-		lset vbackptr($v) $b $a
-	    }
-	    lset vlastins($v) $ka $a
-	}
+        if {![info exists kidchanged($a)]} continue
+        set id [lindex $varcstart($v) $a]
+        if {[llength $children($v,$id)] > 1} {
+            set children($v,$id) [lsort -command [list vtokcmp $v] \
+                                      $children($v,$id)]
+        }
+        set oldtok [lindex $varctok($v) $a]
+        if {!$vdatemode($v)} {
+            set tok {}
+        } else {
+            set tok $oldtok
+        }
+        set ka 0
+        set kid [last_real_child $v,$id]
+        if {$kid ne {}} {
+            set k $varcid($v,$kid)
+            if {[string compare [lindex $varctok($v) $k] $tok] > 0} {
+                set ki $kid
+                set ka $k
+                set tok [lindex $varctok($v) $k]
+            }
+        }
+        if {$ka != 0} {
+            set i [lsearch -exact $parents($v,$ki) $id]
+            set j [expr {[llength $parents($v,$ki)] - 1 - $i}]
+            append tok [strrep $j]
+        }
+        if {$tok eq $oldtok} {
+            continue
+        }
+        set id [lindex $varccommits($v,$a) end]
+        foreach p $parents($v,$id) {
+            if {[info exists varcid($v,$p)]} {
+                set kidchanged($varcid($v,$p)) 1
+            } else {
+                set sortkids($p) 1
+            }
+        }
+        lset varctok($v) $a $tok
+        set b [lindex $vupptr($v) $a]
+        if {$b != $ka} {
+            if {[string compare [lindex $varctok($v) $ka] $vtokmod($v)] < 0} {
+                modify_arc $v $ka
+            }
+            if {[string compare [lindex $varctok($v) $b] $vtokmod($v)] < 0} {
+                modify_arc $v $b
+            }
+            set c [lindex $vbackptr($v) $a]
+            set d [lindex $vleftptr($v) $a]
+            if {$c == 0} {
+                lset vdownptr($v) $b $d
+            } else {
+                lset vleftptr($v) $c $d
+            }
+            if {$d != 0} {
+                lset vbackptr($v) $d $c
+            }
+            if {[lindex $vlastins($v) $b] == $a} {
+                lset vlastins($v) $b $c
+            }
+            lset vupptr($v) $a $ka
+            set c [lindex $vlastins($v) $ka]
+            if {$c == 0 || \
+                    [string compare $tok [lindex $varctok($v) $c]] < 0} {
+                set c $ka
+                set b [lindex $vdownptr($v) $ka]
+            } else {
+                set b [lindex $vleftptr($v) $c]
+            }
+            while {$b != 0 && \
+                      [string compare $tok [lindex $varctok($v) $b]] >= 0} {
+                set c $b
+                set b [lindex $vleftptr($v) $c]
+            }
+            if {$c == $ka} {
+                lset vdownptr($v) $ka $a
+                lset vbackptr($v) $a 0
+            } else {
+                lset vleftptr($v) $c $a
+                lset vbackptr($v) $a $c
+            }
+            lset vleftptr($v) $a $b
+            if {$b != 0} {
+                lset vbackptr($v) $b $a
+            }
+            lset vlastins($v) $ka $a
+        }
     }
     foreach id [array names sortkids] {
-	if {[llength $children($v,$id)] > 1} {
-	    set children($v,$id) [lsort -command [list vtokcmp $v] \
-				      $children($v,$id)]
-	}
+        if {[llength $children($v,$id)] > 1} {
+            set children($v,$id) [lsort -command [list vtokcmp $v] \
+                                      $children($v,$id)]
+        }
     }
     set t2 [clock clicks -milliseconds]
     #puts "renumbervarc did [llength $todo] of $ntot arcs in [expr {$t2-$t1}]ms"
@@ -936,14 +935,14 @@
 
     set pa $varcid($v,$p)
     if {$p ne [lindex $varcstart($v) $pa]} {
-	splitvarc $p $v
-	set pa $varcid($v,$p)
+        splitvarc $p $v
+        set pa $varcid($v,$p)
     }
     # seeds always need to be renumbered
     if {[lindex $vupptr($v) $pa] == 0 ||
-	[string compare [lindex $varctok($v) $a] \
-	     [lindex $varctok($v) $pa]] > 0} {
-	renumbervarc $pa $v
+        [string compare [lindex $varctok($v) $a] \
+             [lindex $varctok($v) $pa]] > 0} {
+        renumbervarc $pa $v
     }
 }
 
@@ -961,24 +960,24 @@
     set varcid($vid) $a
     lappend vshortids($v,[string range $id 0 3]) $id
     if {[string compare [lindex $varctok($v) $a] $vtokmod($v)] < 0} {
-	modify_arc $v $a
+        modify_arc $v $a
     }
     lappend varccommits($v,$a) $id
     set vp $v,$p
     if {[llength [lappend children($vp) $id]] > 1} {
-	set children($vp) [lsort -command [list vtokcmp $v] $children($vp)]
-	unset -nocomplain ordertok
+        set children($vp) [lsort -command [list vtokcmp $v] $children($vp)]
+        unset -nocomplain ordertok
     }
     fix_reversal $p $a $v
     incr commitidx($v)
     if {$v == $curview} {
-	set numcommits $commitidx($v)
-	setcanvscroll
-	if {[info exists targetid]} {
-	    if {![comes_before $targetid $p]} {
-		incr targetrow
-	    }
-	}
+        set numcommits $commitidx($v)
+        setcanvscroll
+        if {[info exists targetid]} {
+            if {![comes_before $targetid $p]} {
+                incr targetrow
+            }
+        }
     }
 }
 
@@ -990,8 +989,8 @@
     set a $varcid($v,$p)
     set i [lsearch -exact $varccommits($v,$a) $p]
     if {$i < 0} {
-	puts "oops: insertfakerow can't find [shortids $p] on arc $a"
-	return
+        puts "oops: insertfakerow can't find [shortids $p] on arc $a"
+        return
     }
     set children($v,$id) {}
     set parents($v,$id) [list $p]
@@ -1003,9 +1002,9 @@
     set varccommits($v,$a) [linsert $varccommits($v,$a) $i $id]
     modify_arc $v $a $i
     if {[info exists targetid]} {
-	if {![comes_before $targetid $p]} {
-	    incr targetrow
-	}
+        if {![comes_before $targetid $p]} {
+            incr targetrow
+        }
     }
     setcanvscroll
     drawvisible
@@ -1018,15 +1017,15 @@
 
     set v $curview
     if {[llength $parents($v,$id)] != 1} {
-	puts "oops: removefakerow [shortids $id] has [llength $parents($v,$id)] parents"
-	return
+        puts "oops: removefakerow [shortids $id] has [llength $parents($v,$id)] parents"
+        return
     }
     set p [lindex $parents($v,$id) 0]
     set a $varcid($v,$id)
     set i [lsearch -exact $varccommits($v,$a) $id]
     if {$i < 0} {
-	puts "oops: removefakerow can't find [shortids $id] on arc $a"
-	return
+        puts "oops: removefakerow can't find [shortids $id] on arc $a"
+        return
     }
     unset varcid($v,$id)
     set varccommits($v,$a) [lreplace $varccommits($v,$a) $i $i]
@@ -1036,15 +1035,15 @@
     set numcommits [incr commitidx($v) -1]
     set j [lsearch -exact $children($v,$p) $id]
     if {$j >= 0} {
-	set children($v,$p) [lreplace $children($v,$p) $j $j]
+        set children($v,$p) [lreplace $children($v,$p) $j $j]
     }
     modify_arc $v $a $i
     if {[info exist currentid] && $id eq $currentid} {
-	unset currentid
-	set selectedline {}
+        unset currentid
+        set selectedline {}
     }
     if {[info exists targetid] && $targetid eq $id} {
-	set targetid $p
+        set targetid $p
     }
     setcanvscroll
     drawvisible
@@ -1055,9 +1054,9 @@
 
     set kids {}
     foreach id $children($vp) {
-	if {$id ne $nullid && $id ne $nullid2} {
-	    lappend kids $id
-	}
+        if {$id ne $nullid && $id ne $nullid2} {
+            lappend kids $id
+        }
     }
     return $kids
 }
@@ -1066,9 +1065,9 @@
     global children nullid nullid2
 
     foreach id $children($vp) {
-	if {$id ne $nullid && $id ne $nullid2} {
-	    return $id
-	}
+        if {$id ne $nullid && $id ne $nullid2} {
+            return $id
+        }
     }
     return {}
 }
@@ -1078,10 +1077,10 @@
 
     set kids $children($vp)
     for {set i [llength $kids]} {[incr i -1] >= 0} {} {
-	set id [lindex $kids $i]
-	if {$id ne $nullid && $id ne $nullid2} {
-	    return $id
-	}
+        set id [lindex $kids $i]
+        if {$id ne $nullid && $id ne $nullid2} {
+            return $id
+        }
     }
     return {}
 }
@@ -1090,7 +1089,7 @@
     global varctok varcid
 
     return [string compare [lindex $varctok($v) $varcid($v,$a)] \
-		[lindex $varctok($v) $varcid($v,$b)]]
+                [lindex $varctok($v) $varcid($v,$b)]]
 }
 
 # This assumes that if lim is not given, the caller has checked that
@@ -1099,29 +1098,29 @@
     global varctok vtokmod varcmod varcrow vupptr curview vrowmod varccommits
 
     if {$lim ne {}} {
-	set c [string compare [lindex $varctok($v) $a] $vtokmod($v)]
-	if {$c > 0} return
-	if {$c == 0} {
-	    set r [lindex $varcrow($v) $a]
-	    if {$r ne {} && $vrowmod($v) <= $r + $lim} return
-	}
+        set c [string compare [lindex $varctok($v) $a] $vtokmod($v)]
+        if {$c > 0} return
+        if {$c == 0} {
+            set r [lindex $varcrow($v) $a]
+            if {$r ne {} && $vrowmod($v) <= $r + $lim} return
+        }
     }
     set vtokmod($v) [lindex $varctok($v) $a]
     set varcmod($v) $a
     if {$v == $curview} {
-	while {$a != 0 && [lindex $varcrow($v) $a] eq {}} {
-	    set a [lindex $vupptr($v) $a]
-	    set lim {}
-	}
-	set r 0
-	if {$a != 0} {
-	    if {$lim eq {}} {
-		set lim [llength $varccommits($v,$a)]
-	    }
-	    set r [expr {[lindex $varcrow($v) $a] + $lim}]
-	}
-	set vrowmod($v) $r
-	undolayout $r
+        while {$a != 0 && [lindex $varcrow($v) $a] eq {}} {
+            set a [lindex $vupptr($v) $a]
+            set lim {}
+        }
+        set r 0
+        if {$a != 0} {
+            if {$lim eq {}} {
+                set lim [llength $varccommits($v,$a)]
+            }
+            set r [expr {[lindex $varcrow($v) $a] + $lim}]
+        }
+        set vrowmod($v) $r
+        undolayout $r
     }
 }
 
@@ -1133,62 +1132,62 @@
 
     if {$vrowmod($v) == $commitidx($v)} return
     if {$v == $curview} {
-	if {[llength $displayorder] > $vrowmod($v)} {
-	    set displayorder [lrange $displayorder 0 [expr {$vrowmod($v) - 1}]]
-	    set parentlist [lrange $parentlist 0 [expr {$vrowmod($v) - 1}]]
-	}
-	unset -nocomplain cached_commitrow
+        if {[llength $displayorder] > $vrowmod($v)} {
+            set displayorder [lrange $displayorder 0 [expr {$vrowmod($v) - 1}]]
+            set parentlist [lrange $parentlist 0 [expr {$vrowmod($v) - 1}]]
+        }
+        unset -nocomplain cached_commitrow
     }
     set narctot [expr {[llength $varctok($v)] - 1}]
     set a $varcmod($v)
     while {$a != 0 && [lindex $varcix($v) $a] eq {}} {
-	# go up the tree until we find something that has a row number,
-	# or we get to a seed
-	set a [lindex $vupptr($v) $a]
+        # go up the tree until we find something that has a row number,
+        # or we get to a seed
+        set a [lindex $vupptr($v) $a]
     }
     if {$a == 0} {
-	set a [lindex $vdownptr($v) 0]
-	if {$a == 0} return
-	set vrownum($v) {0}
-	set varcorder($v) [list $a]
-	lset varcix($v) $a 0
-	lset varcrow($v) $a 0
-	set arcn 0
-	set row 0
+        set a [lindex $vdownptr($v) 0]
+        if {$a == 0} return
+        set vrownum($v) {0}
+        set varcorder($v) [list $a]
+        lset varcix($v) $a 0
+        lset varcrow($v) $a 0
+        set arcn 0
+        set row 0
     } else {
-	set arcn [lindex $varcix($v) $a]
-	if {[llength $vrownum($v)] > $arcn + 1} {
-	    set vrownum($v) [lrange $vrownum($v) 0 $arcn]
-	    set varcorder($v) [lrange $varcorder($v) 0 $arcn]
-	}
-	set row [lindex $varcrow($v) $a]
+        set arcn [lindex $varcix($v) $a]
+        if {[llength $vrownum($v)] > $arcn + 1} {
+            set vrownum($v) [lrange $vrownum($v) 0 $arcn]
+            set varcorder($v) [lrange $varcorder($v) 0 $arcn]
+        }
+        set row [lindex $varcrow($v) $a]
     }
     while {1} {
-	set p $a
-	incr row [llength $varccommits($v,$a)]
-	# go down if possible
-	set b [lindex $vdownptr($v) $a]
-	if {$b == 0} {
-	    # if not, go left, or go up until we can go left
-	    while {$a != 0} {
-		set b [lindex $vleftptr($v) $a]
-		if {$b != 0} break
-		set a [lindex $vupptr($v) $a]
-	    }
-	    if {$a == 0} break
-	}
-	set a $b
-	incr arcn
-	lappend vrownum($v) $row
-	lappend varcorder($v) $a
-	lset varcix($v) $a $arcn
-	lset varcrow($v) $a $row
+        set p $a
+        incr row [llength $varccommits($v,$a)]
+        # go down if possible
+        set b [lindex $vdownptr($v) $a]
+        if {$b == 0} {
+            # if not, go left, or go up until we can go left
+            while {$a != 0} {
+                set b [lindex $vleftptr($v) $a]
+                if {$b != 0} break
+                set a [lindex $vupptr($v) $a]
+            }
+            if {$a == 0} break
+        }
+        set a $b
+        incr arcn
+        lappend vrownum($v) $row
+        lappend varcorder($v) $a
+        lset varcix($v) $a $arcn
+        lset varcrow($v) $a $row
     }
     set vtokmod($v) [lindex $varctok($v) $p]
     set varcmod($v) $p
     set vrowmod($v) $row
     if {[info exists currentid]} {
-	set selectedline [rowofcommit $currentid]
+        set selectedline [rowofcommit $currentid]
     }
 }
 
@@ -1206,20 +1205,20 @@
 
     set v $curview
     if {![info exists varcid($v,$id)]} {
-	puts "oops rowofcommit no arc for [shortids $id]"
-	return {}
+        puts "oops rowofcommit no arc for [shortids $id]"
+        return {}
     }
     set a $varcid($v,$id)
     if {[string compare [lindex $varctok($v) $a] $vtokmod($v)] >= 0} {
-	update_arcrows $v
+        update_arcrows $v
     }
     if {[info exists cached_commitrow($id)]} {
-	return $cached_commitrow($id)
+        return $cached_commitrow($id)
     }
     set i [lsearch -exact $varccommits($v,$a) $id]
     if {$i < 0} {
-	puts "oops didn't find commit [shortids $id] in arc $a"
-	return {}
+        puts "oops didn't find commit [shortids $id] in arc $a"
+        return {}
     }
     incr i [lindex $varcrow($v) $a]
     set cached_commitrow($id) $i
@@ -1232,32 +1231,32 @@
 
     set v $curview
     if {$a eq $b || ![info exists varcid($v,$a)] || \
-	    ![info exists varcid($v,$b)]} {
-	return 0
+            ![info exists varcid($v,$b)]} {
+        return 0
     }
     if {$varcid($v,$a) != $varcid($v,$b)} {
-	return [expr {[string compare [lindex $varctok($v) $varcid($v,$a)] \
-			   [lindex $varctok($v) $varcid($v,$b)]] < 0}]
+        return [expr {[string compare [lindex $varctok($v) $varcid($v,$a)] \
+                           [lindex $varctok($v) $varcid($v,$b)]] < 0}]
     }
     return [expr {[rowofcommit $a] < [rowofcommit $b]}]
 }
 
 proc bsearch {l elt} {
     if {[llength $l] == 0 || $elt <= [lindex $l 0]} {
-	return 0
+        return 0
     }
     set lo 0
     set hi [llength $l]
     while {$hi - $lo > 1} {
-	set mid [expr {int(($lo + $hi) / 2)}]
-	set t [lindex $l $mid]
-	if {$elt < $t} {
-	    set hi $mid
-	} elseif {$elt > $t} {
-	    set lo $mid
-	} else {
-	    return $mid
-	}
+        set mid [expr {int(($lo + $hi) / 2)}]
+        set t [lindex $l $mid]
+        if {$elt < $t} {
+            set hi $mid
+        } elseif {$elt > $t} {
+            set lo $mid
+        } else {
+            return $mid
+        }
     }
     return $lo
 }
@@ -1269,37 +1268,37 @@
     global d_valid_start d_valid_end
 
     if {$end > $vrowmod($curview)} {
-	update_arcrows $curview
+        update_arcrows $curview
     }
     set ai [bsearch $vrownum($curview) $start]
     set start [lindex $vrownum($curview) $ai]
     set narc [llength $vrownum($curview)]
     for {set r $start} {$ai < $narc && $r < $end} {incr ai} {
-	set a [lindex $varcorder($curview) $ai]
-	set l [llength $displayorder]
-	set al [llength $varccommits($curview,$a)]
-	if {$l < $r + $al} {
-	    if {$l < $r} {
-		set pad [ntimes [expr {$r - $l}] {}]
-		set displayorder [concat $displayorder $pad]
-		set parentlist [concat $parentlist $pad]
-	    } elseif {$l > $r} {
-		set displayorder [lrange $displayorder 0 [expr {$r - 1}]]
-		set parentlist [lrange $parentlist 0 [expr {$r - 1}]]
-	    }
-	    foreach id $varccommits($curview,$a) {
-		lappend displayorder $id
-		lappend parentlist $parents($curview,$id)
-	    }
-	} elseif {[lindex $displayorder [expr {$r + $al - 1}]] eq {}} {
-	    set i $r
-	    foreach id $varccommits($curview,$a) {
-		lset displayorder $i $id
-		lset parentlist $i $parents($curview,$id)
-		incr i
-	    }
-	}
-	incr r $al
+        set a [lindex $varcorder($curview) $ai]
+        set l [llength $displayorder]
+        set al [llength $varccommits($curview,$a)]
+        if {$l < $r + $al} {
+            if {$l < $r} {
+                set pad [ntimes [expr {$r - $l}] {}]
+                set displayorder [concat $displayorder $pad]
+                set parentlist [concat $parentlist $pad]
+            } elseif {$l > $r} {
+                set displayorder [lrange $displayorder 0 [expr {$r - 1}]]
+                set parentlist [lrange $parentlist 0 [expr {$r - 1}]]
+            }
+            foreach id $varccommits($curview,$a) {
+                lappend displayorder $id
+                lappend parentlist $parents($curview,$id)
+            }
+        } elseif {[lindex $displayorder [expr {$r + $al - 1}]] eq {}} {
+            set i $r
+            foreach id $varccommits($curview,$a) {
+                lset displayorder $i $id
+                lset parentlist $i $parents($curview,$id)
+                incr i
+            }
+        }
+        incr r $al
     }
 }
 
@@ -1308,8 +1307,8 @@
 
     set id [lindex $displayorder $row]
     if {$id eq {}} {
-	make_disporder $row [expr {$row + 1}]
-	set id [lindex $displayorder $row]
+        make_disporder $row [expr {$row + 1}]
+        set id [lindex $displayorder $row]
     }
     return $id
 }
@@ -1322,35 +1321,35 @@
     set scripts {}
     set narcs [llength $varctok($v)]
     for {set a 1} {$a < $narcs} {incr a} {
-	set id [lindex $varccommits($v,$a) end]
-	foreach p $parents($v,$id) {
-	    if {[info exists varcid($v,$p)]} continue
-	    # add p as a new commit
-	    incr missing_parents
-	    set cmitlisted($v,$p) 0
-	    set parents($v,$p) {}
-	    if {[llength $children($v,$p)] == 1 &&
-		[llength $parents($v,$id)] == 1} {
-		set b $a
-	    } else {
-		set b [newvarc $v $p]
-	    }
-	    set varcid($v,$p) $b
-	    if {[string compare [lindex $varctok($v) $b] $vtokmod($v)] < 0} {
-		modify_arc $v $b
-	    }
-	    lappend varccommits($v,$b) $p
-	    incr commitidx($v)
-	    if {$v == $curview} {
-		set numcommits $commitidx($v)
-	    }
-	    set scripts [check_interest $p $scripts]
-	}
+        set id [lindex $varccommits($v,$a) end]
+        foreach p $parents($v,$id) {
+            if {[info exists varcid($v,$p)]} continue
+            # add p as a new commit
+            incr missing_parents
+            set cmitlisted($v,$p) 0
+            set parents($v,$p) {}
+            if {[llength $children($v,$p)] == 1 &&
+                [llength $parents($v,$id)] == 1} {
+                set b $a
+            } else {
+                set b [newvarc $v $p]
+            }
+            set varcid($v,$p) $b
+            if {[string compare [lindex $varctok($v) $b] $vtokmod($v)] < 0} {
+                modify_arc $v $b
+            }
+            lappend varccommits($v,$b) $p
+            incr commitidx($v)
+            if {$v == $curview} {
+                set numcommits $commitidx($v)
+            }
+            set scripts [check_interest $p $scripts]
+        }
     }
     if {$missing_parents > 0} {
-	foreach s $scripts {
-	    eval $s
-	}
+        foreach s $scripts {
+            eval $s
+        }
     }
 }
 
@@ -1360,23 +1359,23 @@
     global children parents varcid varctok vtokmod varccommits
 
     foreach ch $children($v,$id) {
-	# make $rwid be $ch's parent in place of $id
-	set i [lsearch -exact $parents($v,$ch) $id]
-	if {$i < 0} {
-	    puts "oops rewrite_commit didn't find $id in parent list for $ch"
-	}
-	set parents($v,$ch) [lreplace $parents($v,$ch) $i $i $rwid]
-	# add $ch to $rwid's children and sort the list if necessary
-	if {[llength [lappend children($v,$rwid) $ch]] > 1} {
-	    set children($v,$rwid) [lsort -command [list vtokcmp $v] \
-					$children($v,$rwid)]
-	}
-	# fix the graph after joining $id to $rwid
-	set a $varcid($v,$ch)
-	fix_reversal $rwid $a $v
-	# parentlist is wrong for the last element of arc $a
-	# even if displayorder is right, hence the 3rd arg here
-	modify_arc $v $a [expr {[llength $varccommits($v,$a)] - 1}]
+        # make $rwid be $ch's parent in place of $id
+        set i [lsearch -exact $parents($v,$ch) $id]
+        if {$i < 0} {
+            puts "oops rewrite_commit didn't find $id in parent list for $ch"
+        }
+        set parents($v,$ch) [lreplace $parents($v,$ch) $i $i $rwid]
+        # add $ch to $rwid's children and sort the list if necessary
+        if {[llength [lappend children($v,$rwid) $ch]] > 1} {
+            set children($v,$rwid) [lsort -command [list vtokcmp $v] \
+                                        $children($v,$rwid)]
+        }
+        # fix the graph after joining $id to $rwid
+        set a $varcid($v,$ch)
+        fix_reversal $rwid $a $v
+        # parentlist is wrong for the last element of arc $a
+        # even if displayorder is right, hence the 3rd arg here
+        modify_arc $v $a [expr {[llength $varccommits($v,$a)] - 1}]
     }
 }
 
@@ -1396,19 +1395,19 @@
 
     set prefix [string range $id 0 3]
     if {[info exists commitinterest($prefix)]} {
-	set newlist {}
-	foreach {i script} $commitinterest($prefix) {
-	    if {[string match "$i*" $id]} {
-		lappend scripts [string map [list "%I" $id "%P" $i] $script]
-	    } else {
-		lappend newlist $i $script
-	    }
-	}
-	if {$newlist ne {}} {
-	    set commitinterest($prefix) $newlist
-	} else {
-	    unset commitinterest($prefix)
-	}
+        set newlist {}
+        foreach {i script} $commitinterest($prefix) {
+            if {[string match "$i*" $id]} {
+                lappend scripts [string map [list "%I" $id "%P" $i] $script]
+            } else {
+                lappend newlist $i $script
+            }
+        }
+        if {$newlist ne {}} {
+            set commitinterest($prefix) $newlist
+        } else {
+            unset commitinterest($prefix)
+        }
     }
     return $scripts
 }
@@ -1423,192 +1422,192 @@
     set stuff [read $fd 500000]
     # git log doesn't terminate the last commit with a null...
     if {$stuff == {} && $leftover($inst) ne {} && [eof $fd]} {
-	set stuff "\0"
+        set stuff "\0"
     }
     if {$stuff == {}} {
-	if {![eof $fd]} {
-	    return 1
-	}
-	global commfd viewcomplete viewactive viewname
-	global viewinstances
-	unset commfd($inst)
-	set i [lsearch -exact $viewinstances($view) $inst]
-	if {$i >= 0} {
-	    set viewinstances($view) [lreplace $viewinstances($view) $i $i]
-	}
-	# set it blocking so we wait for the process to terminate
-	fconfigure $fd -blocking 1
-	if {[catch {close $fd} err]} {
-	    set fv {}
-	    if {$view != $curview} {
-		set fv " for the \"$viewname($view)\" view"
-	    }
-	    if {[string range $err 0 4] == "usage"} {
-		set err "Gitk: error reading commits$fv:\
-			bad arguments to git log."
-		if {$viewname($view) eq [mc "Command line"]} {
-		    append err \
-			"  (Note: arguments to gitk are passed to git log\
-			 to allow selection of commits to be displayed.)"
-		}
-	    } else {
-		set err "Error reading commits$fv: $err"
-	    }
-	    error_popup $err
-	}
-	if {[incr viewactive($view) -1] <= 0} {
-	    set viewcomplete($view) 1
-	    # Check if we have seen any ids listed as parents that haven't
-	    # appeared in the list
-	    closevarcs $view
-	    notbusy $view
-	}
-	if {$view == $curview} {
-	    run chewcommits
-	}
-	return 0
+        if {![eof $fd]} {
+            return 1
+        }
+        global commfd viewcomplete viewactive viewname
+        global viewinstances
+        unset commfd($inst)
+        set i [lsearch -exact $viewinstances($view) $inst]
+        if {$i >= 0} {
+            set viewinstances($view) [lreplace $viewinstances($view) $i $i]
+        }
+        # set it blocking so we wait for the process to terminate
+        fconfigure $fd -blocking 1
+        if {[catch {close $fd} err]} {
+            set fv {}
+            if {$view != $curview} {
+                set fv " for the \"$viewname($view)\" view"
+            }
+            if {[string range $err 0 4] == "usage"} {
+                set err "Gitk: error reading commits$fv:\
+                        bad arguments to git log."
+                if {$viewname($view) eq [mc "Command line"]} {
+                    append err \
+                        "  (Note: arguments to gitk are passed to git log\
+                         to allow selection of commits to be displayed.)"
+                }
+            } else {
+                set err "Error reading commits$fv: $err"
+            }
+            error_popup $err
+        }
+        if {[incr viewactive($view) -1] <= 0} {
+            set viewcomplete($view) 1
+            # Check if we have seen any ids listed as parents that haven't
+            # appeared in the list
+            closevarcs $view
+            notbusy $view
+        }
+        if {$view == $curview} {
+            run chewcommits
+        }
+        return 0
     }
     set start 0
     set gotsome 0
     set scripts {}
     while 1 {
-	set i [string first "\0" $stuff $start]
-	if {$i < 0} {
-	    append leftover($inst) [string range $stuff $start end]
-	    break
-	}
-	if {$start == 0} {
-	    set cmit $leftover($inst)
-	    append cmit [string range $stuff 0 [expr {$i - 1}]]
-	    set leftover($inst) {}
-	} else {
-	    set cmit [string range $stuff $start [expr {$i - 1}]]
-	}
-	set start [expr {$i + 1}]
-	set j [string first "\n" $cmit]
-	set ok 0
-	set listed 1
-	if {$j >= 0 && [string match "commit *" $cmit]} {
-	    set ids [string range $cmit 7 [expr {$j - 1}]]
-	    if {[string match {[-^<>]*} $ids]} {
-		switch -- [string index $ids 0] {
-		    "-" {set listed 0}
-		    "^" {set listed 2}
-		    "<" {set listed 3}
-		    ">" {set listed 4}
-		}
-		set ids [string range $ids 1 end]
-	    }
-	    set ok 1
-	    foreach id $ids {
-		if {[string length $id] != 40} {
-		    set ok 0
-		    break
-		}
-	    }
-	}
-	if {!$ok} {
-	    set shortcmit $cmit
-	    if {[string length $shortcmit] > 80} {
-		set shortcmit "[string range $shortcmit 0 80]..."
-	    }
-	    error_popup "[mc "Can't parse git log output:"] {$shortcmit}"
-	    exit 1
-	}
-	set id [lindex $ids 0]
-	set vid $view,$id
+        set i [string first "\0" $stuff $start]
+        if {$i < 0} {
+            append leftover($inst) [string range $stuff $start end]
+            break
+        }
+        if {$start == 0} {
+            set cmit $leftover($inst)
+            append cmit [string range $stuff 0 [expr {$i - 1}]]
+            set leftover($inst) {}
+        } else {
+            set cmit [string range $stuff $start [expr {$i - 1}]]
+        }
+        set start [expr {$i + 1}]
+        set j [string first "\n" $cmit]
+        set ok 0
+        set listed 1
+        if {$j >= 0 && [string match "commit *" $cmit]} {
+            set ids [string range $cmit 7 [expr {$j - 1}]]
+            if {[string match {[-^<>]*} $ids]} {
+                switch -- [string index $ids 0] {
+                    "-" {set listed 0}
+                    "^" {set listed 2}
+                    "<" {set listed 3}
+                    ">" {set listed 4}
+                }
+                set ids [string range $ids 1 end]
+            }
+            set ok 1
+            foreach id $ids {
+                if {[string length $id] != 40} {
+                    set ok 0
+                    break
+                }
+            }
+        }
+        if {!$ok} {
+            set shortcmit $cmit
+            if {[string length $shortcmit] > 80} {
+                set shortcmit "[string range $shortcmit 0 80]..."
+            }
+            error_popup "[mc "Can't parse git log output:"] {$shortcmit}"
+            exit 1
+        }
+        set id [lindex $ids 0]
+        set vid $view,$id
 
-	lappend vshortids($view,[string range $id 0 3]) $id
+        lappend vshortids($view,[string range $id 0 3]) $id
 
-	if {!$listed && $updating && ![info exists varcid($vid)] &&
-	    $vfilelimit($view) ne {}} {
-	    # git log doesn't rewrite parents for unlisted commits
-	    # when doing path limiting, so work around that here
-	    # by working out the rewritten parent with git rev-list
-	    # and if we already know about it, using the rewritten
-	    # parent as a substitute parent for $id's children.
-	    if {![catch {
-		set rwid [exec git rev-list --first-parent --max-count=1 \
-			      $id -- $vfilelimit($view)]
-	    }]} {
-		if {$rwid ne {} && [info exists varcid($view,$rwid)]} {
-		    # use $rwid in place of $id
-		    rewrite_commit $view $id $rwid
-		    continue
-		}
-	    }
-	}
+        if {!$listed && $updating && ![info exists varcid($vid)] &&
+            $vfilelimit($view) ne {}} {
+            # git log doesn't rewrite parents for unlisted commits
+            # when doing path limiting, so work around that here
+            # by working out the rewritten parent with git rev-list
+            # and if we already know about it, using the rewritten
+            # parent as a substitute parent for $id's children.
+            if {![catch {
+                set rwid [exec git rev-list --first-parent --max-count=1 \
+                              $id -- $vfilelimit($view)]
+            }]} {
+                if {$rwid ne {} && [info exists varcid($view,$rwid)]} {
+                    # use $rwid in place of $id
+                    rewrite_commit $view $id $rwid
+                    continue
+                }
+            }
+        }
 
-	set a 0
-	if {[info exists varcid($vid)]} {
-	    if {$cmitlisted($vid) || !$listed} continue
-	    set a $varcid($vid)
-	}
-	if {$listed} {
-	    set olds [lrange $ids 1 end]
-	} else {
-	    set olds {}
-	}
-	set commitdata($id) [string range $cmit [expr {$j + 1}] end]
-	set cmitlisted($vid) $listed
-	set parents($vid) $olds
-	if {![info exists children($vid)]} {
-	    set children($vid) {}
-	} elseif {$a == 0 && [llength $children($vid)] == 1} {
-	    set k [lindex $children($vid) 0]
-	    if {[llength $parents($view,$k)] == 1 &&
-		(!$vdatemode($view) ||
-		 $varcid($view,$k) == [llength $varctok($view)] - 1)} {
-		set a $varcid($view,$k)
-	    }
-	}
-	if {$a == 0} {
-	    # new arc
-	    set a [newvarc $view $id]
-	}
-	if {[string compare [lindex $varctok($view) $a] $vtokmod($view)] < 0} {
-	    modify_arc $view $a
-	}
-	if {![info exists varcid($vid)]} {
-	    set varcid($vid) $a
-	    lappend varccommits($view,$a) $id
-	    incr commitidx($view)
-	}
+        set a 0
+        if {[info exists varcid($vid)]} {
+            if {$cmitlisted($vid) || !$listed} continue
+            set a $varcid($vid)
+        }
+        if {$listed} {
+            set olds [lrange $ids 1 end]
+        } else {
+            set olds {}
+        }
+        set commitdata($id) [string range $cmit [expr {$j + 1}] end]
+        set cmitlisted($vid) $listed
+        set parents($vid) $olds
+        if {![info exists children($vid)]} {
+            set children($vid) {}
+        } elseif {$a == 0 && [llength $children($vid)] == 1} {
+            set k [lindex $children($vid) 0]
+            if {[llength $parents($view,$k)] == 1 &&
+                (!$vdatemode($view) ||
+                 $varcid($view,$k) == [llength $varctok($view)] - 1)} {
+                set a $varcid($view,$k)
+            }
+        }
+        if {$a == 0} {
+            # new arc
+            set a [newvarc $view $id]
+        }
+        if {[string compare [lindex $varctok($view) $a] $vtokmod($view)] < 0} {
+            modify_arc $view $a
+        }
+        if {![info exists varcid($vid)]} {
+            set varcid($vid) $a
+            lappend varccommits($view,$a) $id
+            incr commitidx($view)
+        }
 
-	set i 0
-	foreach p $olds {
-	    if {$i == 0 || [lsearch -exact $olds $p] >= $i} {
-		set vp $view,$p
-		if {[llength [lappend children($vp) $id]] > 1 &&
-		    [vtokcmp $view [lindex $children($vp) end-1] $id] > 0} {
-		    set children($vp) [lsort -command [list vtokcmp $view] \
-					   $children($vp)]
-		    unset -nocomplain ordertok
-		}
-		if {[info exists varcid($view,$p)]} {
-		    fix_reversal $p $a $view
-		}
-	    }
-	    incr i
-	}
+        set i 0
+        foreach p $olds {
+            if {$i == 0 || [lsearch -exact $olds $p] >= $i} {
+                set vp $view,$p
+                if {[llength [lappend children($vp) $id]] > 1 &&
+                    [vtokcmp $view [lindex $children($vp) end-1] $id] > 0} {
+                    set children($vp) [lsort -command [list vtokcmp $view] \
+                                           $children($vp)]
+                    unset -nocomplain ordertok
+                }
+                if {[info exists varcid($view,$p)]} {
+                    fix_reversal $p $a $view
+                }
+            }
+            incr i
+        }
 
-	set scripts [check_interest $id $scripts]
-	set gotsome 1
+        set scripts [check_interest $id $scripts]
+        set gotsome 1
     }
     if {$gotsome} {
-	global numcommits hlview
+        global numcommits hlview
 
-	if {$view == $curview} {
-	    set numcommits $commitidx($view)
-	    run chewcommits
-	}
-	if {[info exists hlview] && $view == $hlview} {
-	    # we never actually get here...
-	    run vhighlightmore
-	}
-	foreach s $scripts {
-	    eval $s
-	}
+        if {$view == $curview} {
+            set numcommits $commitidx($view)
+            run chewcommits
+        }
+        if {[info exists hlview] && $view == $hlview} {
+            # we never actually get here...
+            run vhighlightmore
+        }
+        foreach s $scripts {
+            eval $s
+        }
     }
     return 2
 }
@@ -1619,28 +1618,28 @@
 
     layoutmore
     if {$viewcomplete($curview)} {
-	global commitidx varctok
-	global numcommits startmsecs
+        global commitidx varctok
+        global numcommits startmsecs
 
-	if {[info exists pending_select]} {
-	    update
-	    reset_pending_select {}
+        if {[info exists pending_select]} {
+            update
+            reset_pending_select {}
 
-	    if {[commitinview $pending_select $curview]} {
-		selectline [rowofcommit $pending_select] 1
-	    } else {
-		set row [first_real_row]
-		selectline $row 1
-	    }
-	}
-	if {$commitidx($curview) > 0} {
-	    #set ms [expr {[clock clicks -milliseconds] - $startmsecs}]
-	    #puts "overall $ms ms for $numcommits commits"
-	    #puts "[llength $varctok($view)] arcs, $commitidx($view) commits"
-	} else {
-	    show_status [mc "No commits selected"]
-	}
-	notbusy layout
+            if {[commitinview $pending_select $curview]} {
+                selectline [rowofcommit $pending_select] 1
+            } else {
+                set row [first_real_row]
+                selectline $row 1
+            }
+        }
+        if {$commitidx($curview) > 0} {
+            #set ms [expr {[clock clicks -milliseconds] - $startmsecs}]
+            #puts "overall $ms ms for $numcommits commits"
+            #puts "[llength $varctok($view)] arcs, $commitidx($view) commits"
+        } else {
+            show_status [mc "No commits selected"]
+        }
+        notbusy layout
     }
     return 0
 }
@@ -1653,7 +1652,7 @@
     # Read the results using i18n.logoutputencoding
     fconfigure $fd -translation lf -eofchar {}
     if {$tclencoding != {}} {
-	fconfigure $fd -encoding $tclencoding
+        fconfigure $fd -encoding $tclencoding
     }
     set contents [read $fd]
     close $fd
@@ -1680,44 +1679,44 @@
     set comdate {}
     set hdrend [string first "\n\n" $contents]
     if {$hdrend < 0} {
-	# should never happen...
-	set hdrend [string length $contents]
+        # should never happen...
+        set hdrend [string length $contents]
     }
     set header [string range $contents 0 [expr {$hdrend - 1}]]
     set comment [string range $contents [expr {$hdrend + 2}] end]
     foreach line [split $header "\n"] {
-	set line [split $line " "]
-	set tag [lindex $line 0]
-	if {$tag == "author"} {
-	    set audate [lrange $line end-1 end]
-	    set auname [join [lrange $line 1 end-2] " "]
-	} elseif {$tag == "committer"} {
-	    set comdate [lrange $line end-1 end]
-	    set comname [join [lrange $line 1 end-2] " "]
-	}
+        set line [split $line " "]
+        set tag [lindex $line 0]
+        if {$tag == "author"} {
+            set audate [lrange $line end-1 end]
+            set auname [join [lrange $line 1 end-2] " "]
+        } elseif {$tag == "committer"} {
+            set comdate [lrange $line end-1 end]
+            set comname [join [lrange $line 1 end-2] " "]
+        }
     }
     set headline {}
     # take the first non-blank line of the comment as the headline
     set headline [string trimleft $comment]
     set i [string first "\n" $headline]
     if {$i >= 0} {
-	set headline [string range $headline 0 $i]
+        set headline [string range $headline 0 $i]
     }
     set headline [string trimright $headline]
     set i [string first "\r" $headline]
     if {$i >= 0} {
-	set headline [string trimright [string range $headline 0 $i]]
+        set headline [string trimright [string range $headline 0 $i]]
     }
     if {!$listed} {
-	# git log indents the comment by 4 spaces;
-	# if we got this via git cat-file, add the indentation
-	set newcomment {}
-	foreach line [split $comment "\n"] {
-	    append newcomment "    "
-	    append newcomment $line
-	    append newcomment "\n"
-	}
-	set comment $newcomment
+        # git log indents the comment by 4 spaces;
+        # if we got this via git cat-file, add the indentation
+        set newcomment {}
+        foreach line [split $comment "\n"] {
+            append newcomment "    "
+            append newcomment $line
+            append newcomment "\n"
+        }
+        set comment $newcomment
     }
     set hasnote [string first "\nNotes:\n" $contents]
     set diff ""
@@ -1726,23 +1725,23 @@
     # diff.
     set i [string first "\n\ndiff" $comment]
     if {$i >= 0} {
-	set diff [string range $comment $i+1 end]
-	set comment [string range $comment 0 $i-1]
+        set diff [string range $comment $i+1 end]
+        set comment [string range $comment 0 $i-1]
     }
     set commitinfo($id) [list $headline $auname $audate \
-			     $comname $comdate $comment $hasnote $diff]
+                             $comname $comdate $comment $hasnote $diff]
 }
 
 proc getcommit {id} {
     global commitdata commitinfo
 
     if {[info exists commitdata($id)]} {
-	parsecommit $id $commitdata($id) 1
+        parsecommit $id $commitdata($id) 1
     } else {
-	readcommit $id
-	if {![info exists commitinfo($id)]} {
-	    set commitinfo($id) [list [mc "No commit information available"]]
-	}
+        readcommit $id
+        if {![info exists commitinfo($id)]} {
+            set commitinfo($id) [list [mc "No commit information available"]]
+        }
     }
     return 1
 }
@@ -1755,22 +1754,22 @@
 
     set ids {}
     if {[string length $prefix] >= 4} {
-	set vshortid $curview,[string range $prefix 0 3]
-	if {[info exists vshortids($vshortid)]} {
-	    foreach id $vshortids($vshortid) {
-		if {[string match "$prefix*" $id]} {
-		    if {[lsearch -exact $ids $id] < 0} {
-			lappend ids $id
-			if {[llength $ids] >= 2} break
-		    }
-		}
-	    }
-	}
+        set vshortid $curview,[string range $prefix 0 3]
+        if {[info exists vshortids($vshortid)]} {
+            foreach id $vshortids($vshortid) {
+                if {[string match "$prefix*" $id]} {
+                    if {[lsearch -exact $ids $id] < 0} {
+                        lappend ids $id
+                        if {[llength $ids] >= 2} break
+                    }
+                }
+            }
+        }
     } else {
-	foreach match [array names varcid "$curview,$prefix*"] {
-	    lappend ids [lindex [split $match ","] 1]
-	    if {[llength $ids] >= 2} break
-	}
+        foreach match [array names varcid "$curview,$prefix*"] {
+            lappend ids [lindex [split $match ","] 1]
+            if {[llength $ids] >= 2} break
+        }
     }
     return $ids
 }
@@ -1780,57 +1779,61 @@
     global otherrefids idotherrefs mainhead mainheadid
     global selecthead selectheadid
     global hideremotes
+    global tclencoding
 
     foreach v {tagids idtags headids idheads otherrefids idotherrefs} {
-	unset -nocomplain $v
+        unset -nocomplain $v
     }
     set refd [open [list | git show-ref -d] r]
+    if {$tclencoding != {}} {
+        fconfigure $refd -encoding $tclencoding
+    }
     while {[gets $refd line] >= 0} {
-	if {[string index $line 40] ne " "} continue
-	set id [string range $line 0 39]
-	set ref [string range $line 41 end]
-	if {![string match "refs/*" $ref]} continue
-	set name [string range $ref 5 end]
-	if {[string match "remotes/*" $name]} {
-	    if {![string match "*/HEAD" $name] && !$hideremotes} {
-		set headids($name) $id
-		lappend idheads($id) $name
-	    }
-	} elseif {[string match "heads/*" $name]} {
-	    set name [string range $name 6 end]
-	    set headids($name) $id
-	    lappend idheads($id) $name
-	} elseif {[string match "tags/*" $name]} {
-	    # this lets refs/tags/foo^{} overwrite refs/tags/foo,
-	    # which is what we want since the former is the commit ID
-	    set name [string range $name 5 end]
-	    if {[string match "*^{}" $name]} {
-		set name [string range $name 0 end-3]
-	    } else {
-		set tagobjid($name) $id
-	    }
-	    set tagids($name) $id
-	    lappend idtags($id) $name
-	} else {
-	    set otherrefids($name) $id
-	    lappend idotherrefs($id) $name
-	}
+        if {[string index $line 40] ne " "} continue
+        set id [string range $line 0 39]
+        set ref [string range $line 41 end]
+        if {![string match "refs/*" $ref]} continue
+        set name [string range $ref 5 end]
+        if {[string match "remotes/*" $name]} {
+            if {![string match "*/HEAD" $name] && !$hideremotes} {
+                set headids($name) $id
+                lappend idheads($id) $name
+            }
+        } elseif {[string match "heads/*" $name]} {
+            set name [string range $name 6 end]
+            set headids($name) $id
+            lappend idheads($id) $name
+        } elseif {[string match "tags/*" $name]} {
+            # this lets refs/tags/foo^{} overwrite refs/tags/foo,
+            # which is what we want since the former is the commit ID
+            set name [string range $name 5 end]
+            if {[string match "*^{}" $name]} {
+                set name [string range $name 0 end-3]
+            } else {
+                set tagobjid($name) $id
+            }
+            set tagids($name) $id
+            lappend idtags($id) $name
+        } else {
+            set otherrefids($name) $id
+            lappend idotherrefs($id) $name
+        }
     }
     catch {close $refd}
     set mainhead {}
     set mainheadid {}
     catch {
-	set mainheadid [exec git rev-parse HEAD]
-	set thehead [exec git symbolic-ref HEAD]
-	if {[string match "refs/heads/*" $thehead]} {
-	    set mainhead [string range $thehead 11 end]
-	}
+        set mainheadid [exec git rev-parse HEAD]
+        set thehead [exec git symbolic-ref HEAD]
+        if {[string match "refs/heads/*" $thehead]} {
+            set mainhead [string range $thehead 11 end]
+        }
     }
     set selectheadid {}
     if {$selecthead ne {}} {
-	catch {
-	    set selectheadid [exec git rev-parse --verify $selecthead]
-	}
+        catch {
+            set selectheadid [exec git rev-parse --verify $selecthead]
+        }
     }
 }
 
@@ -1839,10 +1842,10 @@
     global nullid nullid2 numcommits
 
     for {set row 0} {$row < $numcommits} {incr row} {
-	set id [commitonrow $row]
-	if {$id ne $nullid && $id ne $nullid2} {
-	    break
-	}
+        set id [commitonrow $row]
+        if {$id ne $nullid && $id ne $nullid2} {
+            break
+        }
     }
     return $row
 }
@@ -1861,12 +1864,12 @@
     global headids idheads
 
     if {$idheads($id) eq $name} {
-	unset idheads($id)
+        unset idheads($id)
     } else {
-	set i [lsearch -exact $idheads($id) $name]
-	if {$i >= 0} {
-	    set idheads($id) [lreplace $idheads($id) $i $i]
-	}
+        set i [lsearch -exact $idheads($id) $name]
+        if {$i >= 0} {
+            set idheads($id) [lreplace $idheads($id) $i $i]
+        }
     }
     unset headids($name)
 }
@@ -1894,7 +1897,7 @@
     # Windows fails to place transient windows normally, so
     # schedule a callback to center them on the parent.
     if {[tk windowingsystem] eq {win32}} {
-	after idle [list tk::PlaceWindow $window widget $origin]
+        after idle [list tk::PlaceWindow $window widget $origin]
     }
 }
 
@@ -1994,41 +1997,41 @@
 proc makemenu {m items} {
     menu $m
     if {[tk windowingsystem] eq {aqua}} {
-	set Meta1 Cmd
+        set Meta1 Cmd
     } else {
-	set Meta1 Ctrl
+        set Meta1 Ctrl
     }
     foreach i $items {
-	set name [mc [lindex $i 1]]
-	set type [lindex $i 2]
-	set thing [lindex $i 3]
-	set params [list $type]
-	if {$name ne {}} {
-	    set u [string first "&" [string map {&& x} $name]]
-	    lappend params -label [string map {&& & & {}} $name]
-	    if {$u >= 0} {
-		lappend params -underline $u
-	    }
-	}
-	switch -- $type {
-	    "cascade" {
-		set submenu [string tolower [string map {& ""} [lindex $i 1]]]
-		lappend params -menu $m.$submenu
-	    }
-	    "command" {
-		lappend params -command $thing
-	    }
-	    "radiobutton" {
-		lappend params -variable [lindex $thing 0] \
-		    -value [lindex $thing 1]
-	    }
-	}
-	set tail [lrange $i 4 end]
-	regsub -all {\yMeta1\y} $tail $Meta1 tail
-	eval $m add $params $tail
-	if {$type eq "cascade"} {
-	    makemenu $m.$submenu $thing
-	}
+        set name [mc [lindex $i 1]]
+        set type [lindex $i 2]
+        set thing [lindex $i 3]
+        set params [list $type]
+        if {$name ne {}} {
+            set u [string first "&" [string map {&& x} $name]]
+            lappend params -label [string map {&& & & {}} $name]
+            if {$u >= 0} {
+                lappend params -underline $u
+            }
+        }
+        switch -- $type {
+            "cascade" {
+                set submenu [string tolower [string map {& ""} [lindex $i 1]]]
+                lappend params -menu $m.$submenu
+            }
+            "command" {
+                lappend params -command $thing
+            }
+            "radiobutton" {
+                lappend params -variable [lindex $thing 0] \
+                    -value [lindex $thing 1]
+            }
+        }
+        set tail [lrange $i 4 end]
+        regsub -all {\yMeta1\y} $tail $Meta1 tail
+        eval $m add $params $tail
+        if {$type eq "cascade"} {
+            makemenu $m.$submenu $thing
+        }
     }
 }
 
@@ -2048,12 +2051,12 @@
             set cx [string length $label]
             if {$cx > $width} {set width $cx}
         }
-	set gm [ttk::combobox $w -width $width -state readonly\
-		    -textvariable $varname -values $args \
-		    -exportselection false]
-	bind $gm <<ComboboxSelected>> [list $gm selection clear]
+        set gm [ttk::combobox $w -width $width -state readonly\
+                    -textvariable $varname -values $args \
+                    -exportselection false]
+        bind $gm <<ComboboxSelected>> [list $gm selection clear]
     } else {
-	set gm [eval [linsert $args 0 tk_optionMenu $w $varname]]
+        set gm [eval [linsert $args 0 tk_optionMenu $w $varname]]
     }
     return $gm
 }
@@ -2069,7 +2072,7 @@
     global rowctxmenu fakerowmenu mergemax wrapcomment
     global highlight_files gdttype
     global searchstring sstring
-    global bgcolor fgcolor bglist fglist diffcolors selectbgcolor
+    global bgcolor fgcolor bglist fglist diffcolors diffbgcolors selectbgcolor
     global uifgcolor uifgdisabledcolor
     global filesepbgcolor filesepfgcolor
     global mergecolors foundbgcolor currentsearchhitbgcolor
@@ -2083,49 +2086,49 @@
     # The "mc" arguments here are purely so that xgettext
     # sees the following string as needing to be translated
     set file {
-	mc "&File" cascade {
-	    {mc "&Update" command updatecommits -accelerator F5}
-	    {mc "&Reload" command reloadcommits -accelerator Shift-F5}
-	    {mc "Reread re&ferences" command rereadrefs}
-	    {mc "&List references" command showrefs -accelerator F2}
-	    {xx "" separator}
-	    {mc "Start git &gui" command {exec git gui &}}
-	    {xx "" separator}
-	    {mc "&Quit" command doquit -accelerator Meta1-Q}
-	}}
+        mc "&File" cascade {
+            {mc "&Update" command updatecommits -accelerator F5}
+            {mc "&Reload" command reloadcommits -accelerator Shift-F5}
+            {mc "Reread re&ferences" command rereadrefs}
+            {mc "&List references" command showrefs -accelerator F2}
+            {xx "" separator}
+            {mc "Start git &gui" command {exec git gui &}}
+            {xx "" separator}
+            {mc "&Quit" command doquit -accelerator Meta1-Q}
+        }}
     set edit {
-	mc "&Edit" cascade {
-	    {mc "&Preferences" command doprefs}
-	}}
+        mc "&Edit" cascade {
+            {mc "&Preferences" command doprefs}
+        }}
     set view {
-	mc "&View" cascade {
-	    {mc "&New view..." command {newview 0} -accelerator Shift-F4}
-	    {mc "&Edit view..." command editview -state disabled -accelerator F4}
-	    {mc "&Delete view" command delview -state disabled}
-	    {xx "" separator}
-	    {mc "&All files" radiobutton {selectedview 0} -command {showview 0}}
-	}}
+        mc "&View" cascade {
+            {mc "&New view..." command {newview 0} -accelerator Shift-F4}
+            {mc "&Edit view..." command editview -state disabled -accelerator F4}
+            {mc "&Delete view" command delview -state disabled}
+            {xx "" separator}
+            {mc "&All files" radiobutton {selectedview 0} -command {showview 0}}
+        }}
     if {[tk windowingsystem] ne "aqua"} {
-	set help {
-	mc "&Help" cascade {
-	    {mc "&About gitk" command about}
-	    {mc "&Key bindings" command keys}
-	}}
-	set bar [list $file $edit $view $help]
+        set help {
+        mc "&Help" cascade {
+            {mc "&About gitk" command about}
+            {mc "&Key bindings" command keys}
+        }}
+        set bar [list $file $edit $view $help]
     } else {
-	proc ::tk::mac::ShowPreferences {} {doprefs}
-	proc ::tk::mac::Quit {} {doquit}
-	lset file end [lreplace [lindex $file end] end-1 end]
-	set apple {
-	xx "&Apple" cascade {
-	    {mc "&About gitk" command about}
-	    {xx "" separator}
-	}}
-	set help {
-	mc "&Help" cascade {
-	    {mc "&Key bindings" command keys}
-	}}
-	set bar [list $apple $file $view $help]
+        proc ::tk::mac::ShowPreferences {} {doprefs}
+        proc ::tk::mac::Quit {} {doquit}
+        lset file end [lreplace [lindex $file end] end-1 end]
+        set apple {
+        xx "&Apple" cascade {
+            {mc "&About gitk" command about}
+            {xx "" separator}
+        }}
+        set help {
+        mc "&Help" cascade {
+            {mc "&Key bindings" command keys}
+        }}
+        set bar [list $apple $file $view $help]
     }
     makemenu .bar $bar
     . configure -menu .bar
@@ -2153,36 +2156,36 @@
     ${NS}::frame .tf.histframe
     ${NS}::panedwindow .tf.histframe.pwclist -orient horizontal
     if {!$use_ttk} {
-	.tf.histframe.pwclist configure -sashpad 0 -handlesize 4
+        .tf.histframe.pwclist configure -sashpad 0 -handlesize 4
     }
 
     # create three canvases
     set cscroll .tf.histframe.csb
     set canv .tf.histframe.pwclist.canv
     canvas $canv \
-	-selectbackground $selectbgcolor \
-	-background $bgcolor -bd 0 \
-	-yscrollincr $linespc -yscrollcommand "scrollcanv $cscroll"
+        -selectbackground $selectbgcolor \
+        -background $bgcolor -bd 0 \
+        -yscrollincr $linespc -yscrollcommand "scrollcanv $cscroll"
     .tf.histframe.pwclist add $canv
     set canv2 .tf.histframe.pwclist.canv2
     canvas $canv2 \
-	-selectbackground $selectbgcolor \
-	-background $bgcolor -bd 0 -yscrollincr $linespc
+        -selectbackground $selectbgcolor \
+        -background $bgcolor -bd 0 -yscrollincr $linespc
     .tf.histframe.pwclist add $canv2
     set canv3 .tf.histframe.pwclist.canv3
     canvas $canv3 \
-	-selectbackground $selectbgcolor \
-	-background $bgcolor -bd 0 -yscrollincr $linespc
+        -selectbackground $selectbgcolor \
+        -background $bgcolor -bd 0 -yscrollincr $linespc
     .tf.histframe.pwclist add $canv3
     if {$use_ttk} {
-	bind .tf.histframe.pwclist <Map> {
-	    bind %W <Map> {}
-	    .tf.histframe.pwclist sashpos 1 [lindex $::geometry(pwsash1) 0]
-	    .tf.histframe.pwclist sashpos 0 [lindex $::geometry(pwsash0) 0]
-	}
+        bind .tf.histframe.pwclist <Map> {
+            bind %W <Map> {}
+            .tf.histframe.pwclist sashpos 1 [lindex $::geometry(pwsash1) 0]
+            .tf.histframe.pwclist sashpos 0 [lindex $::geometry(pwsash0) 0]
+        }
     } else {
-	eval .tf.histframe.pwclist sash place 0 $geometry(pwsash0)
-	eval .tf.histframe.pwclist sash place 1 $geometry(pwsash1)
+        eval .tf.histframe.pwclist sash place 0 $geometry(pwsash0)
+        eval .tf.histframe.pwclist sash place 1 $geometry(pwsash1)
     }
 
     # a scroll bar to rule them
@@ -2201,7 +2204,7 @@
     set entries $sha1entry
     set sha1but .tf.bar.sha1label
     button $sha1but -text "[mc "SHA1 ID:"] " -state disabled -relief flat \
-	-command gotocommit -width 8
+        -command gotocommit -width 8
     $sha1but conf -disabledforeground [$sha1but cget -foreground]
     pack .tf.bar.sha1label -side left
     ${NS}::entry $sha1entry -width 40 -font textfont -textvariable sha1string
@@ -2209,20 +2212,20 @@
     pack $sha1entry -side left -pady 2
 
     set bm_left_data {
-	#define left_width 16
-	#define left_height 16
-	static unsigned char left_bits[] = {
-	0x00, 0x00, 0xc0, 0x01, 0xe0, 0x00, 0x70, 0x00, 0x38, 0x00, 0x1c, 0x00,
-	0x0e, 0x00, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x0e, 0x00, 0x1c, 0x00,
-	0x38, 0x00, 0x70, 0x00, 0xe0, 0x00, 0xc0, 0x01};
+        #define left_width 16
+        #define left_height 16
+        static unsigned char left_bits[] = {
+        0x00, 0x00, 0xc0, 0x01, 0xe0, 0x00, 0x70, 0x00, 0x38, 0x00, 0x1c, 0x00,
+        0x0e, 0x00, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x0e, 0x00, 0x1c, 0x00,
+        0x38, 0x00, 0x70, 0x00, 0xe0, 0x00, 0xc0, 0x01};
     }
     set bm_right_data {
-	#define right_width 16
-	#define right_height 16
-	static unsigned char right_bits[] = {
-	0x00, 0x00, 0xc0, 0x01, 0x80, 0x03, 0x00, 0x07, 0x00, 0x0e, 0x00, 0x1c,
-	0x00, 0x38, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x00, 0x38, 0x00, 0x1c,
-	0x00, 0x0e, 0x00, 0x07, 0x80, 0x03, 0xc0, 0x01};
+        #define right_width 16
+        #define right_height 16
+        static unsigned char right_bits[] = {
+        0x00, 0x00, 0xc0, 0x01, 0x80, 0x03, 0x00, 0x07, 0x00, 0x0e, 0x00, 0x1c,
+        0x00, 0x38, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x00, 0x38, 0x00, 0x1c,
+        0x00, 0x0e, 0x00, 0x07, 0x80, 0x03, 0xc0, 0x01};
     }
     image create bitmap bm-left -data $bm_left_data -foreground $uifgcolor
     image create bitmap bm-left-gray -data $bm_left_data -foreground $uifgdisabledcolor
@@ -2231,28 +2234,28 @@
 
     ${NS}::button .tf.bar.leftbut -command goback -state disabled -width 26
     if {$use_ttk} {
-	.tf.bar.leftbut configure -image [list bm-left disabled bm-left-gray]
+        .tf.bar.leftbut configure -image [list bm-left disabled bm-left-gray]
     } else {
-	.tf.bar.leftbut configure -image bm-left
+        .tf.bar.leftbut configure -image bm-left
     }
     pack .tf.bar.leftbut -side left -fill y
     ${NS}::button .tf.bar.rightbut -command goforw -state disabled -width 26
     if {$use_ttk} {
-	.tf.bar.rightbut configure -image [list bm-right disabled bm-right-gray]
+        .tf.bar.rightbut configure -image [list bm-right disabled bm-right-gray]
     } else {
-	.tf.bar.rightbut configure -image bm-right
+        .tf.bar.rightbut configure -image bm-right
     }
     pack .tf.bar.rightbut -side left -fill y
 
     ${NS}::label .tf.bar.rowlabel -text [mc "Row"]
     set rownumsel {}
     ${NS}::label .tf.bar.rownum -width 7 -textvariable rownumsel \
-	-relief sunken -anchor e
+        -relief sunken -anchor e
     ${NS}::label .tf.bar.rowlabel2 -text "/"
     ${NS}::label .tf.bar.numcommits -width 7 -textvariable numcommits \
-	-relief sunken -anchor e
+        -relief sunken -anchor e
     pack .tf.bar.rowlabel .tf.bar.rownum .tf.bar.rowlabel2 .tf.bar.numcommits \
-	-side left
+        -side left
     if {!$use_ttk} {
         foreach w {rownum numcommits} {.tf.bar.$w configure -font textfont}
     }
@@ -2264,14 +2267,14 @@
     ${NS}::label $statusw -width 15 -relief sunken
     pack $statusw -side left -padx 5
     if {$use_ttk} {
-	set progresscanv [ttk::progressbar .tf.bar.progress]
+        set progresscanv [ttk::progressbar .tf.bar.progress]
     } else {
-	set h [expr {[font metrics uifont -linespace] + 2}]
-	set progresscanv .tf.bar.progress
-	canvas $progresscanv -relief sunken -height $h -borderwidth 2
-	set progressitem [$progresscanv create rect -1 0 0 $h -fill "#00ff00"]
-	set fprogitem [$progresscanv create rect -1 0 0 $h -fill yellow]
-	set rprogitem [$progresscanv create rect -1 0 0 $h -fill red]
+        set h [expr {[font metrics uifont -linespace] + 2}]
+        set progresscanv .tf.bar.progress
+        canvas $progresscanv -relief sunken -height $h -borderwidth 2
+        set progressitem [$progresscanv create rect -1 0 0 $h -fill "#00ff00"]
+        set fprogitem [$progresscanv create rect -1 0 0 $h -fill yellow]
+        set rprogitem [$progresscanv create rect -1 0 0 $h -fill red]
     }
     pack $progresscanv -side right -expand 1 -fill x -padx {0 2}
     set progresscoords {0 0}
@@ -2285,26 +2288,26 @@
     ${NS}::label .tf.lbar.flabel -text "[mc "Find"] "
 
     set bm_down_data {
-	#define down_width 16
-	#define down_height 16
-	static unsigned char down_bits[] = {
-	0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
-	0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
-	0x87, 0xe1, 0x8e, 0x71, 0x9c, 0x39, 0xb8, 0x1d,
-	0xf0, 0x0f, 0xe0, 0x07, 0xc0, 0x03, 0x80, 0x01};
+        #define down_width 16
+        #define down_height 16
+        static unsigned char down_bits[] = {
+        0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
+        0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
+        0x87, 0xe1, 0x8e, 0x71, 0x9c, 0x39, 0xb8, 0x1d,
+        0xf0, 0x0f, 0xe0, 0x07, 0xc0, 0x03, 0x80, 0x01};
     }
     image create bitmap bm-down -data $bm_down_data -foreground $uifgcolor
     ${NS}::button .tf.lbar.fnext -width 26 -command {dofind 1 1}
     .tf.lbar.fnext configure -image bm-down
 
     set bm_up_data {
-	#define up_width 16
-	#define up_height 16
-	static unsigned char up_bits[] = {
-	0x80, 0x01, 0xc0, 0x03, 0xe0, 0x07, 0xf0, 0x0f,
-	0xb8, 0x1d, 0x9c, 0x39, 0x8e, 0x71, 0x87, 0xe1,
-	0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
-	0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01};
+        #define up_width 16
+        #define up_height 16
+        static unsigned char up_bits[] = {
+        0x80, 0x01, 0xc0, 0x03, 0xe0, 0x07, 0xf0, 0x0f,
+        0xb8, 0x1d, 0x9c, 0x39, 0x8e, 0x71, 0x87, 0xe1,
+        0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01,
+        0x80, 0x01, 0x80, 0x01, 0x80, 0x01, 0x80, 0x01};
     }
     image create bitmap bm-up -data $bm_up_data -foreground $uifgcolor
     ${NS}::button .tf.lbar.fprev -width 26 -command {dofind -1 1}
@@ -2313,13 +2316,13 @@
     ${NS}::label .tf.lbar.flab2 -text " [mc "commit"] "
 
     pack .tf.lbar.flabel .tf.lbar.fnext .tf.lbar.fprev .tf.lbar.flab2 \
-	-side left -fill y
+        -side left -fill y
     set gdttype [mc "containing:"]
     set gm [makedroplist .tf.lbar.gdttype gdttype \
-		[mc "containing:"] \
-		[mc "touching paths:"] \
-		[mc "adding/removing string:"] \
-		[mc "changing lines matching:"]]
+                [mc "containing:"] \
+                [mc "touching paths:"] \
+                [mc "adding/removing string:"] \
+                [mc "changing lines matching:"]]
     trace add variable gdttype write gdttype_change
     pack .tf.lbar.gdttype -side left -fill y
 
@@ -2330,11 +2333,11 @@
     trace add variable findstring write find_change
     set findtype [mc "Exact"]
     set findtypemenu [makedroplist .tf.lbar.findtype \
-			  findtype [mc "Exact"] [mc "IgnCase"] [mc "Regexp"]]
+                          findtype [mc "Exact"] [mc "IgnCase"] [mc "Regexp"]]
     trace add variable findtype write findcom_change
     set findloc [mc "All fields"]
     makedroplist .tf.lbar.findloc findloc [mc "All fields"] [mc "Headline"] \
-	[mc "Comments"] [mc "Author"] [mc "Committer"]
+        [mc "Comments"] [mc "Author"] [mc "Committer"]
     trace add variable findloc write find_change
     pack .tf.lbar.findloc -side right
     pack .tf.lbar.findtype -side right
@@ -2346,8 +2349,8 @@
     pack .tf.histframe -fill both -side top -expand 1
     .ctop add .tf
     if {!$use_ttk} {
-	.ctop paneconfigure .tf -height $geometry(topheight)
-	.ctop paneconfigure .tf -width $geometry(topwidth)
+        .ctop paneconfigure .tf -height $geometry(topheight)
+        .ctop paneconfigure .tf -width $geometry(topwidth)
     }
 
     # now build up the bottom
@@ -2357,9 +2360,9 @@
     # if we know window height, then that will set the lower text height, otherwise
     # we set lower text height which will drive window height
     if {[info exists geometry(main)]} {
-	${NS}::frame .bleft -width $geometry(botwidth)
+        ${NS}::frame .bleft -width $geometry(botwidth)
     } else {
-	${NS}::frame .bleft -width $geometry(botwidth) -height $geometry(botheight)
+        ${NS}::frame .bleft -width $geometry(botwidth) -height $geometry(botheight)
     }
     ${NS}::frame .bleft.top
     ${NS}::frame .bleft.mid
@@ -2377,41 +2380,41 @@
     trace add variable searchstring write incrsearch
     pack $sstring -side left -expand 1 -fill x
     ${NS}::radiobutton .bleft.mid.diff -text [mc "Diff"] \
-	-command changediffdisp -variable diffelide -value {0 0}
+        -command changediffdisp -variable diffelide -value {0 0}
     ${NS}::radiobutton .bleft.mid.old -text [mc "Old version"] \
-	-command changediffdisp -variable diffelide -value {0 1}
+        -command changediffdisp -variable diffelide -value {0 1}
     ${NS}::radiobutton .bleft.mid.new -text [mc "New version"] \
-	-command changediffdisp -variable diffelide -value {1 0}
+        -command changediffdisp -variable diffelide -value {1 0}
 
     ${NS}::label .bleft.mid.labeldiffcontext -text "      [mc "Lines of context"]: "
     pack .bleft.mid.diff .bleft.mid.old .bleft.mid.new -side left -ipadx $wgap
     spinbox .bleft.mid.diffcontext -width 5 \
-	-from 0 -increment 1 -to 10000000 \
-	-validate all -validatecommand "diffcontextvalidate %P" \
-	-textvariable diffcontextstring
+        -from 0 -increment 1 -to 10000000 \
+        -validate all -validatecommand "diffcontextvalidate %P" \
+        -textvariable diffcontextstring
     .bleft.mid.diffcontext set $diffcontext
     trace add variable diffcontextstring write diffcontextchange
     lappend entries .bleft.mid.diffcontext
     pack .bleft.mid.labeldiffcontext .bleft.mid.diffcontext -side left -ipadx $wgap
     ${NS}::checkbutton .bleft.mid.ignspace -text [mc "Ignore space change"] \
-	-command changeignorespace -variable ignorespace
+        -command changeignorespace -variable ignorespace
     pack .bleft.mid.ignspace -side left -padx 5
 
     set worddiff [mc "Line diff"]
     if {[package vcompare $git_version "1.7.2"] >= 0} {
-	makedroplist .bleft.mid.worddiff worddiff [mc "Line diff"] \
-	    [mc "Markup words"] [mc "Color words"]
-	trace add variable worddiff write changeworddiff
-	pack .bleft.mid.worddiff -side left -padx 5
+        makedroplist .bleft.mid.worddiff worddiff [mc "Line diff"] \
+            [mc "Markup words"] [mc "Color words"]
+        trace add variable worddiff write changeworddiff
+        pack .bleft.mid.worddiff -side left -padx 5
     }
 
     set ctext .bleft.bottom.ctext
     text $ctext -background $bgcolor -foreground $fgcolor \
-	-state disabled -undo 0 -font textfont \
-	-yscrollcommand scrolltext -wrap none \
-	-xscrollcommand ".bleft.bottom.sbhorizontal set"
+        -state disabled -undo 0 -font textfont \
+        -yscrollcommand scrolltext -wrap none \
+        -xscrollcommand ".bleft.bottom.sbhorizontal set"
     if {$have_tk85} {
-	$ctext conf -tabstyle wordprocessor
+        $ctext conf -tabstyle wordprocessor
     }
     ${NS}::scrollbar .bleft.bottom.sb -command "$ctext yview"
     ${NS}::scrollbar .bleft.bottom.sbhorizontal -command "$ctext xview" -orient h
@@ -2430,7 +2433,9 @@
     $ctext tag conf filesep -font textfontbold -fore $filesepfgcolor -back $filesepbgcolor
     $ctext tag conf hunksep -fore [lindex $diffcolors 2]
     $ctext tag conf d0 -fore [lindex $diffcolors 0]
+    $ctext tag conf d0 -back [lindex $diffbgcolors 0]
     $ctext tag conf dresult -fore [lindex $diffcolors 1]
+    $ctext tag conf dresult -back [lindex $diffbgcolors 1]
     $ctext tag conf m0 -fore [lindex $mergecolors 0]
     $ctext tag conf m1 -fore [lindex $mergecolors 1]
     $ctext tag conf m2 -fore [lindex $mergecolors 2]
@@ -2455,38 +2460,44 @@
     $ctext tag conf currentsearchhit -back $currentsearchhitbgcolor
     $ctext tag conf wwrap -wrap word -lmargin2 1c
     $ctext tag conf bold -font textfontbold
+    # set these to the lowest priority:
+    $ctext tag lower currentsearchhit
+    $ctext tag lower found
+    $ctext tag lower filesep
+    $ctext tag lower dresult
+    $ctext tag lower d0
 
     .pwbottom add .bleft
     if {!$use_ttk} {
-	.pwbottom paneconfigure .bleft -width $geometry(botwidth)
+        .pwbottom paneconfigure .bleft -width $geometry(botwidth)
     }
 
     # lower right
     ${NS}::frame .bright
     ${NS}::frame .bright.mode
     ${NS}::radiobutton .bright.mode.patch -text [mc "Patch"] \
-	-command reselectline -variable cmitmode -value "patch"
+        -command reselectline -variable cmitmode -value "patch"
     ${NS}::radiobutton .bright.mode.tree -text [mc "Tree"] \
-	-command reselectline -variable cmitmode -value "tree"
+        -command reselectline -variable cmitmode -value "tree"
     grid .bright.mode.patch .bright.mode.tree -sticky ew
     pack .bright.mode -side top -fill x
     set cflist .bright.cfiles
     set indent [font measure mainfont "nn"]
     text $cflist \
-	-selectbackground $selectbgcolor \
-	-background $bgcolor -foreground $fgcolor \
-	-font mainfont \
-	-tabs [list $indent [expr {2 * $indent}]] \
-	-yscrollcommand ".bright.sb set" \
-	-cursor [. cget -cursor] \
-	-spacing1 1 -spacing3 1
+        -selectbackground $selectbgcolor \
+        -background $bgcolor -foreground $fgcolor \
+        -font mainfont \
+        -tabs [list $indent [expr {2 * $indent}]] \
+        -yscrollcommand ".bright.sb set" \
+        -cursor [. cget -cursor] \
+        -spacing1 1 -spacing3 1
     lappend bglist $cflist
     lappend fglist $cflist
     ${NS}::scrollbar .bright.sb -command "$cflist yview"
     pack .bright.sb -side right -fill y
     pack $cflist -side left -fill both -expand 1
     $cflist tag configure highlight \
-	-background [$cflist cget -selectbackground]
+        -background [$cflist cget -selectbackground]
     $cflist tag configure bold -font mainfontbold
 
     .pwbottom add .bright
@@ -2494,15 +2505,15 @@
 
     # restore window width & height if known
     if {[info exists geometry(main)]} {
-	if {[scan $geometry(main) "%dx%d" w h] >= 2} {
-	    if {$w > [winfo screenwidth .]} {
-		set w [winfo screenwidth .]
-	    }
-	    if {$h > [winfo screenheight .]} {
-		set h [winfo screenheight .]
-	    }
-	    wm geometry . "${w}x$h"
-	}
+        if {[scan $geometry(main) "%dx%d" w h] >= 2} {
+            if {$w > [winfo screenwidth .]} {
+                set w [winfo screenwidth .]
+            }
+            if {$h > [winfo screenheight .]} {
+                set h [winfo screenheight .]
+            }
+            wm geometry . "${w}x$h"
+        }
     }
 
     if {[info exists geometry(state)] && $geometry(state) eq "zoomed"} {
@@ -2526,25 +2537,25 @@
             bind %W <Map> {}
             %W sashpos 0 $::geometry(botwidth)
         }
+        bind .pwbottom <Configure> {resizecdetpanes %W %w}
     }
 
-    bind .pwbottom <Configure> {resizecdetpanes %W %w}
     pack .ctop -fill both -expand 1
     bindall <1> {selcanvline %W %x %y}
     #bindall <B1-Motion> {selcanvline %W %x %y}
     if {[tk windowingsystem] == "win32"} {
-	bind . <MouseWheel> { windows_mousewheel_redirector %W %X %Y %D }
-	bind $ctext <MouseWheel> { windows_mousewheel_redirector %W %X %Y %D ; break }
+        bind . <MouseWheel> { windows_mousewheel_redirector %W %X %Y %D }
+        bind $ctext <MouseWheel> { windows_mousewheel_redirector %W %X %Y %D ; break }
     } else {
-	bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
-	bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
-	bind $ctext <Button> {
-	    if {"%b" eq 6} {
-		$ctext xview scroll -5 units
-	    } elseif {"%b" eq 7} {
-		$ctext xview scroll 5 units
-	    }
-	}
+        bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
+        bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
+        bind $ctext <Button> {
+            if {"%b" eq 6} {
+                $ctext xview scroll -5 units
+            } elseif {"%b" eq 7} {
+                $ctext xview scroll 5 units
+            }
+        }
         if {[tk windowingsystem] eq "aqua"} {
             bindall <MouseWheel> {
                 set delta [expr {- (%D)}]
@@ -2627,7 +2638,7 @@
     bind $ctext <Button-1> {focus %W}
     bind $ctext <<Selection>> rehighlight_search_results
     for {set i 1} {$i < 10} {incr i} {
-	bind . <$M1B-Key-$i> [list go_to_parent $i]
+        bind . <$M1B-Key-$i> [list go_to_parent $i]
     }
 
     set maincursor [. cget -cursor]
@@ -2636,60 +2647,60 @@
 
     set rowctxmenu .rowctxmenu
     makemenu $rowctxmenu {
-	{mc "Diff this -> selected" command {diffvssel 0}}
-	{mc "Diff selected -> this" command {diffvssel 1}}
-	{mc "Make patch" command mkpatch}
-	{mc "Create tag" command mktag}
-	{mc "Copy commit summary" command copysummary}
-	{mc "Write commit to file" command writecommit}
-	{mc "Create new branch" command mkbranch}
-	{mc "Cherry-pick this commit" command cherrypick}
-	{mc "Reset HEAD branch to here" command resethead}
-	{mc "Mark this commit" command markhere}
-	{mc "Return to mark" command gotomark}
-	{mc "Find descendant of this and mark" command find_common_desc}
-	{mc "Compare with marked commit" command compare_commits}
-	{mc "Diff this -> marked commit" command {diffvsmark 0}}
-	{mc "Diff marked commit -> this" command {diffvsmark 1}}
-	{mc "Revert this commit" command revert}
+        {mc "Diff this -> selected" command {diffvssel 0}}
+        {mc "Diff selected -> this" command {diffvssel 1}}
+        {mc "Make patch" command mkpatch}
+        {mc "Create tag" command mktag}
+        {mc "Copy commit reference" command copyreference}
+        {mc "Write commit to file" command writecommit}
+        {mc "Create new branch" command mkbranch}
+        {mc "Cherry-pick this commit" command cherrypick}
+        {mc "Reset HEAD branch to here" command resethead}
+        {mc "Mark this commit" command markhere}
+        {mc "Return to mark" command gotomark}
+        {mc "Find descendant of this and mark" command find_common_desc}
+        {mc "Compare with marked commit" command compare_commits}
+        {mc "Diff this -> marked commit" command {diffvsmark 0}}
+        {mc "Diff marked commit -> this" command {diffvsmark 1}}
+        {mc "Revert this commit" command revert}
     }
     $rowctxmenu configure -tearoff 0
 
     set fakerowmenu .fakerowmenu
     makemenu $fakerowmenu {
-	{mc "Diff this -> selected" command {diffvssel 0}}
-	{mc "Diff selected -> this" command {diffvssel 1}}
-	{mc "Make patch" command mkpatch}
-	{mc "Diff this -> marked commit" command {diffvsmark 0}}
-	{mc "Diff marked commit -> this" command {diffvsmark 1}}
+        {mc "Diff this -> selected" command {diffvssel 0}}
+        {mc "Diff selected -> this" command {diffvssel 1}}
+        {mc "Make patch" command mkpatch}
+        {mc "Diff this -> marked commit" command {diffvsmark 0}}
+        {mc "Diff marked commit -> this" command {diffvsmark 1}}
     }
     $fakerowmenu configure -tearoff 0
 
     set headctxmenu .headctxmenu
     makemenu $headctxmenu {
-	{mc "Check out this branch" command cobranch}
-	{mc "Rename this branch" command mvbranch}
-	{mc "Remove this branch" command rmbranch}
-	{mc "Copy branch name" command {clipboard clear; clipboard append $headmenuhead}}
+        {mc "Check out this branch" command cobranch}
+        {mc "Rename this branch" command mvbranch}
+        {mc "Remove this branch" command rmbranch}
+        {mc "Copy branch name" command {clipboard clear; clipboard append $headmenuhead}}
     }
     $headctxmenu configure -tearoff 0
 
     global flist_menu
     set flist_menu .flistctxmenu
     makemenu $flist_menu {
-	{mc "Highlight this too" command {flist_hl 0}}
-	{mc "Highlight this only" command {flist_hl 1}}
-	{mc "External diff" command {external_diff}}
-	{mc "Blame parent commit" command {external_blame 1}}
-	{mc "Copy path" command {clipboard clear; clipboard append $flist_menu_file}}
+        {mc "Highlight this too" command {flist_hl 0}}
+        {mc "Highlight this only" command {flist_hl 1}}
+        {mc "External diff" command {external_diff}}
+        {mc "Blame parent commit" command {external_blame 1}}
+        {mc "Copy path" command {clipboard clear; clipboard append $flist_menu_file}}
     }
     $flist_menu configure -tearoff 0
 
     global diff_menu
     set diff_menu .diffctxmenu
     makemenu $diff_menu {
-	{mc "Show origin of this line" command show_line_source}
-	{mc "Run git gui blame on this line" command {external_blame_diff}}
+        {mc "Show origin of this line" command show_line_source}
+        {mc "Run git gui blame on this line" command {external_blame_diff}}
     }
     $diff_menu configure -tearoff 0
 }
@@ -2701,14 +2712,14 @@
     global canv canv2 canv3
     set w [winfo containing -displayof $W $X $Y]
     if {$w ne ""} {
-	set u [expr {$D < 0 ? 5 : -5}]
-	if {$w == $canv || $w == $canv2 || $w == $canv3} {
-	    allcanvs yview scroll $u units
-	} else {
-	    catch {
-		$w yview scroll $u units
-	    }
-	}
+        set u [expr {$D < 0 ? 5 : -5}]
+        if {$w == $canv || $w == $canv2 || $w == $canv3} {
+            allcanvs yview scroll $u units
+        } else {
+            catch {
+                $w yview scroll $u units
+            }
+        }
     }
 }
 
@@ -2717,9 +2728,9 @@
     global selectedline rownumsel
 
     if {$selectedline eq {}} {
-	set rownumsel {}
+        set rownumsel {}
     } else {
-	set rownumsel [expr {$selectedline + 1}]
+        set rownumsel [expr {$selectedline + 1}]
     }
 }
 
@@ -2728,11 +2739,11 @@
 proc canvscan {op w x y} {
     global canv canv2 canv3
     foreach c [list $canv $canv2 $canv3] {
-	if {$c == $w} {
-	    $c scan $op $x $y
-	} else {
-	    $c scan $op 0 $y
-	}
+        if {$c == $w} {
+            $c scan $op $x $y
+        } else {
+            $c scan $op 0 $y
+        }
     }
 }
 
@@ -2750,10 +2761,10 @@
     bind . $ev $script
     set escript [bind Entry $ev]
     if {$escript == {}} {
-	set escript [bind Entry <Key>]
+        set escript [bind Entry <Key>]
     }
     foreach e $entries {
-	bind $e $ev "$escript; break"
+        bind $e $ev "$escript; break"
     }
 }
 
@@ -2767,7 +2778,7 @@
 proc click {w} {
     global ctext entries
     foreach e [concat $entries $ctext] {
-	if {$w == $e} return
+        if {$w == $e} return
     }
     focus .
 }
@@ -2779,8 +2790,8 @@
     global rprogitem rprogcoord use_ttk
 
     if {$use_ttk} {
-	$progresscanv configure -value [expr {int($fprogcoord * 100)}]
-	return
+        $progresscanv configure -value [expr {int($fprogcoord * 100)}]
+        return
     }
 
     set w [expr {[winfo width $progresscanv] - 4}]
@@ -2792,11 +2803,11 @@
     $progresscanv coords $rprogitem 0 0 [expr {$w * $rprogcoord}] $h
     set now [clock clicks -milliseconds]
     if {$now >= $lastprogupdate + 100} {
-	set progupdatepending 0
-	update
+        set progupdatepending 0
+        update
     } elseif {!$progupdatepending} {
-	set progupdatepending 1
-	after [expr {$lastprogupdate + 100 - $now}] doprogupdate
+        set progupdatepending 1
+        after [expr {$lastprogupdate + 100 - $now}] doprogupdate
     }
 }
 
@@ -2804,9 +2815,9 @@
     global lastprogupdate progupdatepending
 
     if {$progupdatepending} {
-	set progupdatepending 0
-	set lastprogupdate [clock clicks -milliseconds]
-	update
+        set progupdatepending 0
+        set lastprogupdate [clock clicks -milliseconds]
+        update
     }
 }
 
@@ -2814,14 +2825,14 @@
     global config_file_tmp
 
     if {[file exists $config_file_tmp]} {
-	incr tries_left -1
-	if {$tries_left > 0} {
-	    after 100 [list config_check_tmp_exists $tries_left]
-	} else {
-	    error_popup "There appears to be a stale $config_file_tmp\
+        incr tries_left -1
+        if {$tries_left > 0} {
+            after 100 [list config_check_tmp_exists $tries_left]
+        } else {
+            error_popup "There appears to be a stale $config_file_tmp\
  file, which will prevent gitk from saving its configuration on exit.\
  Please remove it if it is not being used by any existing gitk process."
-	}
+        }
     }
 }
 
@@ -2838,9 +2849,9 @@
 
     upvar #0 $name var
     if {$op eq "write" &&
-	(![info exists config_variable_original($name)] ||
-	 $config_variable_original($name) ne $var)} {
-	set config_variable_changed($name) 1
+        (![info exists config_variable_original($name)] ||
+         $config_variable_original($name) ne $var)} {
+        set config_variable_changed($name) 1
     }
 }
 
@@ -2862,151 +2873,158 @@
     if {![winfo viewable .]} return
     set remove_tmp 0
     if {[catch {
-	set try_count 0
-	while {[catch {set f [open $config_file_tmp {WRONLY CREAT EXCL}]}]} {
-	    if {[incr try_count] > 50} {
-		error "Unable to write config file: $config_file_tmp exists"
-	    }
-	    after 100
-	}
-	set remove_tmp 1
-	if {$::tcl_platform(platform) eq {windows}} {
-	    file attributes $config_file_tmp -hidden true
-	}
-	if {[file exists $config_file]} {
-	    source $config_file
-	}
-	foreach var_name $config_variables {
-	    upvar #0 $var_name var
-	    upvar 0 $var_name old_var
-	    if {!$config_variable_changed($var_name) && [info exists old_var]} {
-		puts $f [list set $var_name $old_var]
-	    } else {
-		puts $f [list set $var_name $var]
-	    }
-	}
+        set try_count 0
+        while {[catch {set f [open $config_file_tmp {WRONLY CREAT EXCL}]}]} {
+            if {[incr try_count] > 50} {
+                error "Unable to write config file: $config_file_tmp exists"
+            }
+            after 100
+        }
+        set remove_tmp 1
+        if {$::tcl_platform(platform) eq {windows}} {
+            file attributes $config_file_tmp -hidden true
+        }
+        if {[file exists $config_file]} {
+            source $config_file
+        }
+        foreach var_name $config_variables {
+            upvar #0 $var_name var
+            upvar 0 $var_name old_var
+            if {!$config_variable_changed($var_name) && [info exists old_var]} {
+                puts $f [list set $var_name $old_var]
+            } else {
+                puts $f [list set $var_name $var]
+            }
+        }
 
-	puts $f "set geometry(main) [wm geometry .]"
-	puts $f "set geometry(state) [wm state .]"
-	puts $f "set geometry(topwidth) [winfo width .tf]"
-	puts $f "set geometry(topheight) [winfo height .tf]"
-	if {$current_use_ttk} {
-	    puts $f "set geometry(pwsash0) \"[.tf.histframe.pwclist sashpos 0] 1\""
-	    puts $f "set geometry(pwsash1) \"[.tf.histframe.pwclist sashpos 1] 1\""
-	} else {
-	    puts $f "set geometry(pwsash0) \"[.tf.histframe.pwclist sash coord 0]\""
-	    puts $f "set geometry(pwsash1) \"[.tf.histframe.pwclist sash coord 1]\""
-	}
-	puts $f "set geometry(botwidth) [winfo width .bleft]"
-	puts $f "set geometry(botheight) [winfo height .bleft]"
+        puts $f "set geometry(main) [wm geometry .]"
+        puts $f "set geometry(state) [wm state .]"
+        puts $f "set geometry(topwidth) [winfo width .tf]"
+        puts $f "set geometry(topheight) [winfo height .tf]"
+        if {$current_use_ttk} {
+            puts $f "set geometry(pwsash0) \"[.tf.histframe.pwclist sashpos 0] 1\""
+            puts $f "set geometry(pwsash1) \"[.tf.histframe.pwclist sashpos 1] 1\""
+        } else {
+            puts $f "set geometry(pwsash0) \"[.tf.histframe.pwclist sash coord 0]\""
+            puts $f "set geometry(pwsash1) \"[.tf.histframe.pwclist sash coord 1]\""
+        }
+        puts $f "set geometry(botwidth) [winfo width .bleft]"
+        puts $f "set geometry(botheight) [winfo height .bleft]"
 
-	array set view_save {}
-	array set views {}
-	if {![info exists permviews]} { set permviews {} }
-	foreach view $permviews {
-	    set view_save([lindex $view 0]) 1
-	    set views([lindex $view 0]) $view
-	}
-	puts -nonewline $f "set permviews {"
-	for {set v 1} {$v < $current_nextviewnum} {incr v} {
-	    if {$viewchanged($v)} {
-		if {$current_viewperm($v)} {
-		    set views($current_viewname($v)) [list $current_viewname($v) $current_viewfiles($v) $current_viewargs($v) $current_viewargscmd($v)]
-		} else {
-		    set view_save($current_viewname($v)) 0
-		}
-	    }
-	}
-	# write old and updated view to their places and append remaining to the end
-	foreach view $permviews {
-	    set view_name [lindex $view 0]
-	    if {$view_save($view_name)} {
-		puts $f "{$views($view_name)}"
-	    }
-	    unset views($view_name)
-	}
-	foreach view_name [array names views] {
-	    puts $f "{$views($view_name)}"
-	}
-	puts $f "}"
-	close $f
-	file rename -force $config_file_tmp $config_file
-	set remove_tmp 0
+        array set view_save {}
+        array set views {}
+        if {![info exists permviews]} { set permviews {} }
+        foreach view $permviews {
+            set view_save([lindex $view 0]) 1
+            set views([lindex $view 0]) $view
+        }
+        puts -nonewline $f "set permviews {"
+        for {set v 1} {$v < $current_nextviewnum} {incr v} {
+            if {$viewchanged($v)} {
+                if {$current_viewperm($v)} {
+                    set views($current_viewname($v)) [list $current_viewname($v) $current_viewfiles($v) $current_viewargs($v) $current_viewargscmd($v)]
+                } else {
+                    set view_save($current_viewname($v)) 0
+                }
+            }
+        }
+        # write old and updated view to their places and append remaining to the end
+        foreach view $permviews {
+            set view_name [lindex $view 0]
+            if {$view_save($view_name)} {
+                puts $f "{$views($view_name)}"
+            }
+            unset views($view_name)
+        }
+        foreach view_name [array names views] {
+            puts $f "{$views($view_name)}"
+        }
+        puts $f "}"
+        close $f
+        file rename -force $config_file_tmp $config_file
+        set remove_tmp 0
     } err]} {
         puts "Error saving config: $err"
     }
     if {$remove_tmp} {
-	file delete -force $config_file_tmp
+        file delete -force $config_file_tmp
     }
     set stuffsaved 1
 }
 
 proc resizeclistpanes {win w} {
-    global oldwidth use_ttk
+    global oldwidth oldsash use_ttk
     if {[info exists oldwidth($win)]} {
-	if {$use_ttk} {
-	    set s0 [$win sashpos 0]
-	    set s1 [$win sashpos 1]
-	} else {
-	    set s0 [$win sash coord 0]
-	    set s1 [$win sash coord 1]
-	}
-	if {$w < 60} {
-	    set sash0 [expr {int($w/2 - 2)}]
-	    set sash1 [expr {int($w*5/6 - 2)}]
-	} else {
-	    set factor [expr {1.0 * $w / $oldwidth($win)}]
-	    set sash0 [expr {int($factor * [lindex $s0 0])}]
-	    set sash1 [expr {int($factor * [lindex $s1 0])}]
-	    if {$sash0 < 30} {
-		set sash0 30
-	    }
-	    if {$sash1 < $sash0 + 20} {
-		set sash1 [expr {$sash0 + 20}]
-	    }
-	    if {$sash1 > $w - 10} {
-		set sash1 [expr {$w - 10}]
-		if {$sash0 > $sash1 - 20} {
-		    set sash0 [expr {$sash1 - 20}]
-		}
-	    }
-	}
-	if {$use_ttk} {
-	    $win sashpos 0 $sash0
-	    $win sashpos 1 $sash1
-	} else {
-	    $win sash place 0 $sash0 [lindex $s0 1]
-	    $win sash place 1 $sash1 [lindex $s1 1]
-	}
+	if {[info exists oldsash($win)]} {
+	    set s0 [lindex $oldsash($win) 0]
+	    set s1 [lindex $oldsash($win) 1]
+        } elseif {$use_ttk} {
+            set s0 [$win sashpos 0]
+            set s1 [$win sashpos 1]
+        } else {
+            set s0 [$win sash coord 0]
+            set s1 [$win sash coord 1]
+        }
+        if {$w < 60} {
+            set sash0 [expr {int($w/2 - 2)}]
+            set sash1 [expr {int($w*5/6 - 2)}]
+        } else {
+            set factor [expr {1.0 * $w / $oldwidth($win)}]
+            set sash0 [expr {int($factor * [lindex $s0 0])}]
+            set sash1 [expr {int($factor * [lindex $s1 0])}]
+            if {$sash0 < 30} {
+                set sash0 30
+            }
+            if {$sash1 < $sash0 + 20} {
+                set sash1 [expr {$sash0 + 20}]
+            }
+            if {$sash1 > $w - 10} {
+                set sash1 [expr {$w - 10}]
+                if {$sash0 > $sash1 - 20} {
+                    set sash0 [expr {$sash1 - 20}]
+                }
+            }
+        }
+        if {$use_ttk} {
+            $win sashpos 0 $sash0
+            $win sashpos 1 $sash1
+        } else {
+            $win sash place 0 $sash0 [lindex $s0 1]
+            $win sash place 1 $sash1 [lindex $s1 1]
+        }
+	set oldsash($win) [list $sash0 $sash1]
     }
     set oldwidth($win) $w
 }
 
 proc resizecdetpanes {win w} {
-    global oldwidth use_ttk
+    global oldwidth oldsash use_ttk
     if {[info exists oldwidth($win)]} {
-	if {$use_ttk} {
-	    set s0 [$win sashpos 0]
-	} else {
-	    set s0 [$win sash coord 0]
-	}
-	if {$w < 60} {
-	    set sash0 [expr {int($w*3/4 - 2)}]
-	} else {
-	    set factor [expr {1.0 * $w / $oldwidth($win)}]
-	    set sash0 [expr {int($factor * [lindex $s0 0])}]
-	    if {$sash0 < 45} {
-		set sash0 45
-	    }
-	    if {$sash0 > $w - 15} {
-		set sash0 [expr {$w - 15}]
-	    }
-	}
-	if {$use_ttk} {
-	    $win sashpos 0 $sash0
-	} else {
-	    $win sash place 0 $sash0 [lindex $s0 1]
-	}
+	if {[info exists oldsash($win)]} {
+	    set s0 $oldsash($win)
+        } elseif {$use_ttk} {
+            set s0 [$win sashpos 0]
+        } else {
+            set s0 [$win sash coord 0]
+        }
+        if {$w < 60} {
+            set sash0 [expr {int($w*3/4 - 2)}]
+        } else {
+            set factor [expr {1.0 * $w / $oldwidth($win)}]
+            set sash0 [expr {int($factor * [lindex $s0 0])}]
+            if {$sash0 < 45} {
+                set sash0 45
+            }
+            if {$sash0 > $w - 15} {
+                set sash0 [expr {$w - 15}]
+            }
+        }
+        if {$use_ttk} {
+            $win sashpos 0 $sash0
+        } else {
+            $win sash place 0 $sash0 [lindex $s0 1]
+        }
+	set oldsash($win) $sash0
     }
     set oldwidth($win) $w
 }
@@ -3029,8 +3047,8 @@
     global bgcolor NS
     set w .about
     if {[winfo exists $w]} {
-	raise $w
-	return
+        raise $w
+        return
     }
     ttk_toplevel $w
     wm title $w [mc "About gitk"]
@@ -3041,7 +3059,7 @@
 Copyright \u00a9 2005-2016 Paul Mackerras
 
 Use and redistribute under the terms of the GNU General Public License"] \
-	    -justify center -aspect 400 -border 2 -bg $bgcolor -relief groove
+            -justify center -aspect 400 -border 2 -bg $bgcolor -relief groove
     pack $w.m -side top -fill x -padx 2 -pady 2
     ${NS}::button $w.ok -text [mc "Close"] -command "destroy $w" -default active
     pack $w.ok -side bottom
@@ -3055,13 +3073,13 @@
     global bgcolor NS
     set w .keys
     if {[winfo exists $w]} {
-	raise $w
-	return
+        raise $w
+        return
     }
     if {[tk windowingsystem] eq {aqua}} {
-	set M1T Cmd
+        set M1T Cmd
     } else {
-	set M1T Ctrl
+        set M1T Ctrl
     }
     ttk_toplevel $w
     wm title $w [mc "Gitk key bindings"]
@@ -3108,7 +3126,7 @@
 [mc "<%s-minus>	Decrease font size" $M1T]
 [mc "<F5>		Update"]
 " \
-	    -justify left -bg $bgcolor -border 2 -relief groove
+            -justify left -bg $bgcolor -border 2 -relief groove
     pack $w.m -side top -fill both -padx 2 -pady 2
     ${NS}::button $w.ok -text [mc "Close"] -command "destroy $w" -default active
     bind $w <Key-Escape> [list destroy $w]
@@ -3135,68 +3153,68 @@
     set treecontents() {}
     $w conf -state normal
     foreach f $l {
-	while {[string range $f 0 $prefixend] ne $prefix} {
-	    if {$lev <= $openlevs} {
-		$w mark set e:$treeindex($prefix) "end -1c"
-		$w mark gravity e:$treeindex($prefix) left
-	    }
-	    set treeheight($prefix) $ht
-	    incr ht [lindex $htstack end]
-	    set htstack [lreplace $htstack end end]
-	    set prefixend [lindex $prefendstack end]
-	    set prefendstack [lreplace $prefendstack end end]
-	    set prefix [string range $prefix 0 $prefixend]
-	    incr lev -1
-	}
-	set tail [string range $f [expr {$prefixend+1}] end]
-	while {[set slash [string first "/" $tail]] >= 0} {
-	    lappend htstack $ht
-	    set ht 0
-	    lappend prefendstack $prefixend
-	    incr prefixend [expr {$slash + 1}]
-	    set d [string range $tail 0 $slash]
-	    lappend treecontents($prefix) $d
-	    set oldprefix $prefix
-	    append prefix $d
-	    set treecontents($prefix) {}
-	    set treeindex($prefix) [incr ix]
-	    set treeparent($prefix) $oldprefix
-	    set tail [string range $tail [expr {$slash+1}] end]
-	    if {$lev <= $openlevs} {
-		set ht 1
-		set treediropen($prefix) [expr {$lev < $openlevs}]
-		set bm [expr {$lev == $openlevs? "tri-rt": "tri-dn"}]
-		$w mark set d:$ix "end -1c"
-		$w mark gravity d:$ix left
-		set str "\n"
-		for {set i 0} {$i < $lev} {incr i} {append str "\t"}
-		$w insert end $str
-		$w image create end -align center -image $bm -padx 1 \
-		    -name a:$ix
-		$w insert end $d [highlight_tag $prefix]
-		$w mark set s:$ix "end -1c"
-		$w mark gravity s:$ix left
-	    }
-	    incr lev
-	}
-	if {$tail ne {}} {
-	    if {$lev <= $openlevs} {
-		incr ht
-		set str "\n"
-		for {set i 0} {$i < $lev} {incr i} {append str "\t"}
-		$w insert end $str
-		$w insert end $tail [highlight_tag $f]
-	    }
-	    lappend treecontents($prefix) $tail
-	}
+        while {[string range $f 0 $prefixend] ne $prefix} {
+            if {$lev <= $openlevs} {
+                $w mark set e:$treeindex($prefix) "end -1c"
+                $w mark gravity e:$treeindex($prefix) left
+            }
+            set treeheight($prefix) $ht
+            incr ht [lindex $htstack end]
+            set htstack [lreplace $htstack end end]
+            set prefixend [lindex $prefendstack end]
+            set prefendstack [lreplace $prefendstack end end]
+            set prefix [string range $prefix 0 $prefixend]
+            incr lev -1
+        }
+        set tail [string range $f [expr {$prefixend+1}] end]
+        while {[set slash [string first "/" $tail]] >= 0} {
+            lappend htstack $ht
+            set ht 0
+            lappend prefendstack $prefixend
+            incr prefixend [expr {$slash + 1}]
+            set d [string range $tail 0 $slash]
+            lappend treecontents($prefix) $d
+            set oldprefix $prefix
+            append prefix $d
+            set treecontents($prefix) {}
+            set treeindex($prefix) [incr ix]
+            set treeparent($prefix) $oldprefix
+            set tail [string range $tail [expr {$slash+1}] end]
+            if {$lev <= $openlevs} {
+                set ht 1
+                set treediropen($prefix) [expr {$lev < $openlevs}]
+                set bm [expr {$lev == $openlevs? "tri-rt": "tri-dn"}]
+                $w mark set d:$ix "end -1c"
+                $w mark gravity d:$ix left
+                set str "\n"
+                for {set i 0} {$i < $lev} {incr i} {append str "\t"}
+                $w insert end $str
+                $w image create end -align center -image $bm -padx 1 \
+                    -name a:$ix
+                $w insert end $d [highlight_tag $prefix]
+                $w mark set s:$ix "end -1c"
+                $w mark gravity s:$ix left
+            }
+            incr lev
+        }
+        if {$tail ne {}} {
+            if {$lev <= $openlevs} {
+                incr ht
+                set str "\n"
+                for {set i 0} {$i < $lev} {incr i} {append str "\t"}
+                $w insert end $str
+                $w insert end $tail [highlight_tag $f]
+            }
+            lappend treecontents($prefix) $tail
+        }
     }
     while {$htstack ne {}} {
-	set treeheight($prefix) $ht
-	incr ht [lindex $htstack end]
-	set htstack [lreplace $htstack end end]
-	set prefixend [lindex $prefendstack end]
-	set prefendstack [lreplace $prefendstack end end]
-	set prefix [string range $prefix 0 $prefixend]
+        set treeheight($prefix) $ht
+        incr ht [lindex $htstack end]
+        set htstack [lreplace $htstack end end]
+        set prefixend [lindex $prefendstack end]
+        set prefendstack [lreplace $prefendstack end end]
+        set prefix [string range $prefix 0 $prefixend]
     }
     $w conf -state disabled
 }
@@ -3207,21 +3225,21 @@
     set y 2
     set prefix {}
     while {1} {
-	foreach e $treecontents($prefix) {
-	    if {$y == $l} {
-		return "$prefix$e"
-	    }
-	    set n 1
-	    if {[string index $e end] eq "/"} {
-		set n $treeheight($prefix$e)
-		if {$y + $n > $l} {
-		    append prefix $e
-		    incr y
-		    break
-		}
-	    }
-	    incr y $n
-	}
+        foreach e $treecontents($prefix) {
+            if {$y == $l} {
+                return "$prefix$e"
+            }
+            set n 1
+            if {[string index $e end] eq "/"} {
+                set n $treeheight($prefix$e)
+                if {$y + $n > $l} {
+                    append prefix $e
+                    incr y
+                    break
+                }
+            }
+            incr y $n
+        }
     }
 }
 
@@ -3229,14 +3247,14 @@
     global treeheight treecontents cflist
 
     foreach e $treecontents($prefix) {
-	set path $prefix$e
-	if {[highlight_tag $path] ne {}} {
-	    $cflist tag add bold $y.0 "$y.0 lineend"
-	}
-	incr y
-	if {[string index $e end] eq "/" && $treeheight($path) > 1} {
-	    set y [highlight_tree $y $path]
-	}
+        set path $prefix$e
+        if {[highlight_tag $path] ne {}} {
+            $cflist tag add bold $y.0 "$y.0 lineend"
+        }
+        incr y
+        if {[string index $e end] eq "/" && $treeheight($path) > 1} {
+            set y [highlight_tree $y $path]
+        }
     }
     return $y
 }
@@ -3252,8 +3270,8 @@
     $w conf -state disabled
     set n [expr {1 - $treeheight($dir)}]
     while {$dir ne {}} {
-	incr treeheight($dir) $n
-	set dir $treeparent($dir)
+        incr treeheight($dir) $n
+        set dir $treeparent($dir)
     }
 }
 
@@ -3269,28 +3287,28 @@
     set str "\n"
     set n [llength $treecontents($dir)]
     for {set x $dir} {$x ne {}} {set x $treeparent($x)} {
-	incr lev
-	append str "\t"
-	incr treeheight($x) $n
+        incr lev
+        append str "\t"
+        incr treeheight($x) $n
     }
     foreach e $treecontents($dir) {
-	set de $dir$e
-	if {[string index $e end] eq "/"} {
-	    set iy $treeindex($de)
-	    $w mark set d:$iy e:$ix
-	    $w mark gravity d:$iy left
-	    $w insert e:$ix $str
-	    set treediropen($de) 0
-	    $w image create e:$ix -align center -image tri-rt -padx 1 \
-		-name a:$iy
-	    $w insert e:$ix $e [highlight_tag $de]
-	    $w mark set s:$iy e:$ix
-	    $w mark gravity s:$iy left
-	    set treeheight($de) 1
-	} else {
-	    $w insert e:$ix $str
-	    $w insert e:$ix $e [highlight_tag $de]
-	}
+        set de $dir$e
+        if {[string index $e end] eq "/"} {
+            set iy $treeindex($de)
+            $w mark set d:$iy e:$ix
+            $w mark gravity d:$iy left
+            $w insert e:$ix $str
+            set treediropen($de) 0
+            $w image create e:$ix -align center -image tri-rt -padx 1 \
+                -name a:$iy
+            $w insert e:$ix $e [highlight_tag $de]
+            $w mark set s:$iy e:$ix
+            $w mark gravity s:$iy left
+            set treeheight($de) 1
+        } else {
+            $w insert e:$ix $str
+            $w insert e:$ix $e [highlight_tag $de]
+        }
     }
     $w mark gravity e:$ix right
     $w conf -state disabled
@@ -3299,13 +3317,13 @@
     set ht [$w cget -height]
     set l [lindex [split [$w index s:$ix] .] 0]
     if {$l < $top} {
-	$w yview $l.0
+        $w yview $l.0
     } elseif {$l + $n + 1 > $top + $ht} {
-	set top [expr {$l + $n + 2 - $ht}]
-	if {$l < $top} {
-	    set top $l
-	}
-	$w yview $top.0
+        set top [expr {$l + $n + 2 - $ht}]
+        if {$l < $top} {
+            set top $l
+        }
+        $w yview $top.0
     }
 }
 
@@ -3319,16 +3337,16 @@
     $cflist tag add highlight $l.0 "$l.0 lineend"
     set cflist_top $l
     if {$l == 1} {
-	$ctext yview 1.0
-	return
+        $ctext yview 1.0
+        return
     }
     set e [linetoelt $l]
     if {[string index $e end] ne "/"} {
-	showfile $e
+        showfile $e
     } elseif {$treediropen($e)} {
-	treeclosedir $w $e
+        treeclosedir $w $e
     } else {
-	treeopendir $w $e
+        treeopendir $w $e
     }
 }
 
@@ -3337,10 +3355,10 @@
 
     treeview $cflist $treefilelist($id) 0
     if {$jump_to_here ne {}} {
-	set f [lindex $jump_to_here 0]
-	if {[lsearch -exact $treefilelist($id) $f] >= 0} {
-	    showfile $f
-	}
+        set f [lindex $jump_to_here 0]
+        if {[lsearch -exact $treefilelist($id) $f] >= 0} {
+            showfile $f
+        }
     }
 }
 
@@ -3415,11 +3433,11 @@
     $cflist conf -state normal
     $cflist delete 0.0 end
     if {$first ne {}} {
-	$cflist insert end $first
-	set cflist_top 1
-	$cflist tag add highlight 1.0 "1.0 lineend"
+        $cflist insert end $first
+        set cflist_top 1
+        $cflist tag add highlight 1.0 "1.0 lineend"
     } else {
-	unset -nocomplain cflist_top
+        unset -nocomplain cflist_top
     }
     $cflist conf -state disabled
     set difffilestart {}
@@ -3429,9 +3447,9 @@
     global highlight_paths
 
     foreach p $highlight_paths {
-	if {[string match $p $f]} {
-	    return "bold"
-	}
+        if {[string match $p $f]} {
+            return "bold"
+        }
     }
     return {}
 }
@@ -3441,15 +3459,15 @@
 
     $cflist conf -state normal
     if {$cmitmode ne "tree"} {
-	set end [lindex [split [$cflist index end] .] 0]
-	for {set l 2} {$l < $end} {incr l} {
-	    set line [$cflist get $l.0 "$l.0 lineend"]
-	    if {[highlight_tag $line] ne {}} {
-		$cflist tag add bold $l.0 "$l.0 lineend"
-	    }
-	}
+        set end [lindex [split [$cflist index end] .] 0]
+        for {set l 2} {$l < $end} {incr l} {
+            set line [$cflist get $l.0 "$l.0 lineend"]
+            if {[highlight_tag $line] ne {}} {
+                $cflist tag add bold $l.0 "$l.0 lineend"
+            }
+        }
     } else {
-	highlight_tree 2 {}
+        highlight_tree 2 {}
     }
     $cflist conf -state disabled
 }
@@ -3467,8 +3485,8 @@
 
     $cflist conf -state normal
     foreach f $fl {
-	$cflist insert end "\n"
-	$cflist insert end $f [highlight_tag $f]
+        $cflist insert end "\n"
+        $cflist insert end $f [highlight_tag $f]
     }
     $cflist conf -state disabled
 }
@@ -3483,9 +3501,9 @@
     $cflist tag add highlight $l.0 "$l.0 lineend"
     set cflist_top $l
     if {$l == 1} {
-	$ctext yview 1.0
+        $ctext yview 1.0
     } else {
-	catch {$ctext yview [lindex $difffilestart [expr {$l - 2}]]}
+        catch {$ctext yview [lindex $difffilestart [expr {$l - 2}]]}
     }
     suppress_highlighting_file_for_current_scrollpos
 }
@@ -3498,15 +3516,15 @@
     set l [lindex [split [$w index "@$x,$y"] "."] 0]
     if {$l <= 1} return
     if {$cmitmode eq "tree"} {
-	set e [linetoelt $l]
-	if {[string index $e end] eq "/"} return
+        set e [linetoelt $l]
+        if {[string index $e end] eq "/"} return
     } else {
-	set e [lindex $treediffs($diffids) [expr {$l-2}]]
+        set e [lindex $treediffs($diffids) [expr {$l-2}]]
     }
     set flist_menu_file $e
     set xdiffstate "normal"
     if {$cmitmode eq "tree"} {
-	set xdiffstate "disabled"
+        set xdiffstate "disabled"
     }
     # Disable "External diff" item in tree mode
     $flist_menu entryconf 2 -state $xdiffstate
@@ -3535,7 +3553,7 @@
     set diff_menu_line [lindex $diff_menu_txtpos 0]
     # don't pop up the menu on hunk-separator or file-separator lines
     if {[lsearch -glob [$ctext tag names $diff_menu_line.0] "*sep"] >= 0} {
-	return
+        return
     }
     stopfinding
     set f [find_ctext_fileinfo $diff_menu_line]
@@ -3550,9 +3568,9 @@
 
     set x [shellquote $flist_menu_file]
     if {$only || $findstring eq {} || $gdttype ne [mc "touching paths:"]} {
-	set findstring $x
+        set findstring $x
     } else {
-	append findstring " " $x
+        append findstring " " $x
     }
     set gdttype [mc "touching paths:"]
 }
@@ -3561,29 +3579,29 @@
     global diffnum gitktmpdir gitdir env
 
     if {![info exists gitktmpdir]} {
-	if {[info exists env(GITK_TMPDIR)]} {
-	    set tmpdir $env(GITK_TMPDIR)
-	} elseif {[info exists env(TMPDIR)]} {
-	    set tmpdir $env(TMPDIR)
-	} else {
-	    set tmpdir $gitdir
-	}
-	set gitktmpformat [file join $tmpdir ".gitk-tmp.XXXXXX"]
-	if {[catch {set gitktmpdir [exec mktemp -d $gitktmpformat]}]} {
-	    set gitktmpdir [file join $gitdir [format ".gitk-tmp.%s" [pid]]]
-	}
-	if {[catch {file mkdir $gitktmpdir} err]} {
-	    error_popup "[mc "Error creating temporary directory %s:" $gitktmpdir] $err"
-	    unset gitktmpdir
-	    return {}
-	}
-	set diffnum 0
+        if {[info exists env(GITK_TMPDIR)]} {
+            set tmpdir $env(GITK_TMPDIR)
+        } elseif {[info exists env(TMPDIR)]} {
+            set tmpdir $env(TMPDIR)
+        } else {
+            set tmpdir $gitdir
+        }
+        set gitktmpformat [file join $tmpdir ".gitk-tmp.XXXXXX"]
+        if {[catch {set gitktmpdir [exec mktemp -d $gitktmpformat]}]} {
+            set gitktmpdir [file join $gitdir [format ".gitk-tmp.%s" [pid]]]
+        }
+        if {[catch {file mkdir $gitktmpdir} err]} {
+            error_popup "[mc "Error creating temporary directory %s:" $gitktmpdir] $err"
+            unset gitktmpdir
+            return {}
+        }
+        set diffnum 0
     }
     incr diffnum
     set diffdir [file join $gitktmpdir $diffnum]
     if {[catch {file mkdir $diffdir} err]} {
-	error_popup "[mc "Error creating temporary directory %s:" $diffdir] $err"
-	return {}
+        error_popup "[mc "Error creating temporary directory %s:" $diffdir] $err"
+        return {}
     }
     return $diffdir
 }
@@ -3592,11 +3610,11 @@
     global nullfile
 
     if {[catch {exec git show $filename -- > $output} err]} {
-	if {[string match "fatal: bad revision *" $err]} {
-	    return $nullfile
-	}
-	error_popup "[mc "Error getting \"%s\" from %s:" $filename $what] $err"
-	return {}
+        if {[string match "fatal: bad revision *" $err]} {
+            return $nullfile
+        }
+        error_popup "[mc "Error getting \"%s\" from %s:" $filename $what] $err"
+        return {}
     }
     return $output
 }
@@ -3607,10 +3625,10 @@
 
     if {$diffid == $nullid} {
         set difffile [file join $worktree $filename]
-	if {[file exists $difffile]} {
-	    return $difffile
-	}
-	return $nullfile
+        if {[file exists $difffile]} {
+            return $difffile
+        }
+        return $nullfile
     }
     if {$diffid == $nullid2} {
         set difffile [file join $diffdir "\[index\] [file tail $filename]"]
@@ -3618,7 +3636,7 @@
     }
     set difffile [file join $diffdir "\[$diffid\] [file tail $filename]"]
     return [save_file_from_commit $diffid:$filename $difffile \
-	       "revision $diffid"]
+               "revision $diffid"]
 }
 
 proc external_diff {} {
@@ -3675,18 +3693,18 @@
 
     set s_line [$ctext get $s_lix "$s_lix + 1 lines"]
     if {![regexp {^@@@*(( -\d+(,\d+)?)+) \+(\d+)(,\d+)? @@} $s_line \
-	    s_line old_specs osz osz1 new_line nsz]} {
-	return
+            s_line old_specs osz osz1 new_line nsz]} {
+        return
     }
 
     # base lines for the parents
     set base_lines [list $new_line]
     foreach old_spec [lrange [split $old_specs " "] 1 end] {
-	if {![regexp -- {-(\d+)(,\d+)?} $old_spec \
-	        old_spec old_line osz]} {
-	    return
-	}
-	lappend base_lines $old_line
+        if {![regexp -- {-(\d+)(,\d+)?} $old_spec \
+                old_spec old_line osz]} {
+            return
+        }
+        lappend base_lines $old_line
     }
 
     # Now scan the lines to determine offset within the hunk
@@ -3697,38 +3715,38 @@
     # Determine if the line is removed
     set chunk [$ctext get $line.0 "$line.1 + $max_parent chars"]
     if {[string match {[-+ ]*} $chunk]} {
-	set removed_idx [string first "-" $chunk]
-	# Choose a parent index
-	if {$removed_idx >= 0} {
-	    set parent $removed_idx
-	} else {
-	    set unchanged_idx [string first " " $chunk]
-	    if {$unchanged_idx >= 0} {
-		set parent $unchanged_idx
-	    } else {
-		# blame the current commit
-		set parent -1
-	    }
-	}
-	# then count other lines that belong to it
-	for {set i $line} {[incr i -1] > $s_lno} {} {
-	    set chunk [$ctext get $i.0 "$i.1 + $max_parent chars"]
-	    # Determine if the line is removed
-	    set removed_idx [string first "-" $chunk]
-	    if {$parent >= 0} {
-		set code [string index $chunk $parent]
-		if {$code eq "-" || ($removed_idx < 0 && $code ne "+")} {
-		    incr dline
-		}
-	    } else {
-		if {$removed_idx < 0} {
-		    incr dline
-		}
-	    }
-	}
-	incr parent
+        set removed_idx [string first "-" $chunk]
+        # Choose a parent index
+        if {$removed_idx >= 0} {
+            set parent $removed_idx
+        } else {
+            set unchanged_idx [string first " " $chunk]
+            if {$unchanged_idx >= 0} {
+                set parent $unchanged_idx
+            } else {
+                # blame the current commit
+                set parent -1
+            }
+        }
+        # then count other lines that belong to it
+        for {set i $line} {[incr i -1] > $s_lno} {} {
+            set chunk [$ctext get $i.0 "$i.1 + $max_parent chars"]
+            # Determine if the line is removed
+            set removed_idx [string first "-" $chunk]
+            if {$parent >= 0} {
+                set code [string index $chunk $parent]
+                if {$code eq "-" || ($removed_idx < 0 && $code ne "+")} {
+                    incr dline
+                }
+            } else {
+                if {$removed_idx < 0} {
+                    incr dline
+                }
+            }
+        }
+        incr parent
     } else {
-	set parent 0
+        set parent 0
     }
 
     incr dline [lindex $base_lines $parent]
@@ -3741,17 +3759,17 @@
     global diff_menu_filebase flist_menu_file
 
     if {$cmitmode eq "tree"} {
-	set parent_idx 0
-	set line [expr {$diff_menu_line - $diff_menu_filebase}]
+        set parent_idx 0
+        set line [expr {$diff_menu_line - $diff_menu_filebase}]
     } else {
-	set hinfo [find_hunk_blamespec $diff_menu_filebase $diff_menu_line]
-	if {$hinfo ne {}} {
-	    set parent_idx [lindex $hinfo 0]
-	    set line [lindex $hinfo 1]
-	} else {
-	    set parent_idx 0
-	    set line 0
-	}
+        set hinfo [find_hunk_blamespec $diff_menu_filebase $diff_menu_line]
+        if {$hinfo ne {}} {
+            set parent_idx [lindex $hinfo 0]
+            set line [lindex $hinfo 1]
+        } else {
+            set parent_idx 0
+            set line 0
+        }
     }
 
     external_blame $parent_idx $line
@@ -3762,12 +3780,12 @@
 proc index_sha1 {fname} {
     set f [open [list | git ls-files -s $fname] r]
     while {[gets $f line] >= 0} {
-	set info [lindex [split $line "\t"] 0]
-	set stage [lindex $info 2]
-	if {$stage eq "0" || $stage eq "2"} {
-	    close $f
-	    return [lindex $info 1]
-	}
+        set info [lindex [split $line "\t"] 0]
+        set stage [lindex $info 2]
+        if {$stage eq "0" || $stage eq "2"} {
+            close $f
+            return [lindex $info 1]
+        }
     }
     close $f
     return {}
@@ -3776,7 +3794,7 @@
 # Turn an absolute path into one relative to the current directory
 proc make_relative {f} {
     if {[file pathtype $f] eq "relative"} {
-	return $f
+        return $f
     }
     set elts [file split $f]
     set here [file split [pwd]]
@@ -3784,12 +3802,12 @@
     set hi 0
     set res {}
     foreach d $here {
-	if {$ei < $hi || $ei >= [llength $elts] || [lindex $elts $ei] ne $d} {
-	    lappend res ".."
-	} else {
-	    incr ei
-	}
-	incr hi
+        if {$ei < $hi || $ei >= [llength $elts] || [lindex $elts $ei] ne $d} {
+            lappend res ".."
+        } else {
+            incr ei
+        }
+        incr hi
     }
     set elts [concat $res [lrange $elts $ei end]]
     return [eval file join $elts]
@@ -3801,19 +3819,19 @@
     global parentlist selectedline currentid
 
     if {$parent_idx > 0} {
-	set base_commit [lindex $parentlist $selectedline [expr {$parent_idx-1}]]
+        set base_commit [lindex $parentlist $selectedline [expr {$parent_idx-1}]]
     } else {
-	set base_commit $currentid
+        set base_commit $currentid
     }
 
     if {$base_commit eq {} || $base_commit eq $nullid || $base_commit eq $nullid2} {
-	error_popup [mc "No such commit"]
-	return
+        error_popup [mc "No such commit"]
+        return
     }
 
     set cmdline [list git gui blame]
     if {$line ne {} && $line > 1} {
-	lappend cmdline "--line=$line"
+        lappend cmdline "--line=$line"
     }
     set f [file join $cdup $flist_menu_file]
     # Unfortunately it seems git gui blame doesn't like
@@ -3821,7 +3839,7 @@
     set f [make_relative $f]
     lappend cmdline $base_commit $f
     if {[catch {eval exec $cmdline &} err]} {
-	error_popup "[mc "git gui blame: command failed:"] $err"
+        error_popup "[mc "git gui blame: command failed:"] $err"
     }
 }
 
@@ -3832,61 +3850,61 @@
 
     set from_index {}
     if {$cmitmode eq "tree"} {
-	set id $currentid
-	set line [expr {$diff_menu_line - $diff_menu_filebase}]
+        set id $currentid
+        set line [expr {$diff_menu_line - $diff_menu_filebase}]
     } else {
-	set h [find_hunk_blamespec $diff_menu_filebase $diff_menu_line]
-	if {$h eq {}} return
-	set pi [lindex $h 0]
-	if {$pi == 0} {
-	    mark_ctext_line $diff_menu_line
-	    return
-	}
-	incr pi -1
-	if {$currentid eq $nullid} {
-	    if {$pi > 0} {
-		# must be a merge in progress...
-		if {[catch {
-		    # get the last line from .git/MERGE_HEAD
-		    set f [open [file join $gitdir MERGE_HEAD] r]
-		    set id [lindex [split [read $f] "\n"] end-1]
-		    close $f
-		} err]} {
-		    error_popup [mc "Couldn't read merge head: %s" $err]
-		    return
-		}
-	    } elseif {$parents($curview,$currentid) eq $nullid2} {
-		# need to do the blame from the index
-		if {[catch {
-		    set from_index [index_sha1 $flist_menu_file]
-		} err]} {
-		    error_popup [mc "Error reading index: %s" $err]
-		    return
-		}
-	    } else {
-		set id $parents($curview,$currentid)
-	    }
-	} else {
-	    set id [lindex $parents($curview,$currentid) $pi]
-	}
-	set line [lindex $h 1]
+        set h [find_hunk_blamespec $diff_menu_filebase $diff_menu_line]
+        if {$h eq {}} return
+        set pi [lindex $h 0]
+        if {$pi == 0} {
+            mark_ctext_line $diff_menu_line
+            return
+        }
+        incr pi -1
+        if {$currentid eq $nullid} {
+            if {$pi > 0} {
+                # must be a merge in progress...
+                if {[catch {
+                    # get the last line from .git/MERGE_HEAD
+                    set f [open [file join $gitdir MERGE_HEAD] r]
+                    set id [lindex [split [read $f] "\n"] end-1]
+                    close $f
+                } err]} {
+                    error_popup [mc "Couldn't read merge head: %s" $err]
+                    return
+                }
+            } elseif {$parents($curview,$currentid) eq $nullid2} {
+                # need to do the blame from the index
+                if {[catch {
+                    set from_index [index_sha1 $flist_menu_file]
+                } err]} {
+                    error_popup [mc "Error reading index: %s" $err]
+                    return
+                }
+            } else {
+                set id $parents($curview,$currentid)
+            }
+        } else {
+            set id [lindex $parents($curview,$currentid) $pi]
+        }
+        set line [lindex $h 1]
     }
     set blameargs {}
     if {$from_index ne {}} {
-	lappend blameargs | git cat-file blob $from_index
+        lappend blameargs | git cat-file blob $from_index
     }
     lappend blameargs | git blame -p -L$line,+1
     if {$from_index ne {}} {
-	lappend blameargs --contents -
+        lappend blameargs --contents -
     } else {
-	lappend blameargs $id
+        lappend blameargs $id
     }
     lappend blameargs -- [file join $cdup $flist_menu_file]
     if {[catch {
-	set f [open $blameargs r]
+        set f [open $blameargs r]
     } err]} {
-	error_popup [mc "Couldn't start git blame: %s" $err]
-	return
+        error_popup [mc "Couldn't start git blame: %s" $err]
+        return
     }
     nowbusy blaming [mc "Searching"]
     fconfigure $f -blocking 0
@@ -3900,9 +3918,9 @@
     global blameinst
 
     if {[info exists blameinst]} {
-	stop_instance $blameinst
-	unset blameinst
-	notbusy blaming
+        stop_instance $blameinst
+        unset blameinst
+        notbusy blaming
     }
 }
 
@@ -3910,18 +3928,18 @@
     global blamestuff curview commfd blameinst nullid nullid2
 
     while {[gets $fd line] >= 0} {
-	lappend blamestuff($inst) $line
+        lappend blamestuff($inst) $line
     }
     if {![eof $fd]} {
-	return 1
+        return 1
     }
     unset commfd($inst)
     unset blameinst
     notbusy blaming
     fconfigure $fd -blocking 1
     if {[catch {close $fd} err]} {
-	error_popup [mc "Error running git blame: %s" $err]
-	return 0
+        error_popup [mc "Error running git blame: %s" $err]
+        return 0
     }
 
     set fname {}
@@ -3929,30 +3947,30 @@
     set id [lindex $line 0]
     set lnum [lindex $line 1]
     if {[string length $id] == 40 && [string is xdigit $id] &&
-	[string is digit -strict $lnum]} {
-	# look for "filename" line
-	foreach l $blamestuff($inst) {
-	    if {[string match "filename *" $l]} {
-		set fname [string range $l 9 end]
-		break
-	    }
-	}
+        [string is digit -strict $lnum]} {
+        # look for "filename" line
+        foreach l $blamestuff($inst) {
+            if {[string match "filename *" $l]} {
+                set fname [string range $l 9 end]
+                break
+            }
+        }
     }
     if {$fname ne {}} {
-	# all looks good, select it
-	if {$id eq $nullid} {
-	    # blame uses all-zeroes to mean not committed,
-	    # which would mean a change in the index
-	    set id $nullid2
-	}
-	if {[commitinview $id $curview]} {
-	    selectline [rowofcommit $id] 1 [list $fname $lnum] 1
-	} else {
-	    error_popup [mc "That line comes from commit %s, \
-			     which is not in this view" [shortids $id]]
-	}
+        # all looks good, select it
+        if {$id eq $nullid} {
+            # blame uses all-zeroes to mean not committed,
+            # which would mean a change in the index
+            set id $nullid2
+        }
+        if {[commitinview $id $curview]} {
+            selectline [rowofcommit $id] 1 [list $fname $lnum] 1
+        } else {
+            error_popup [mc "That line comes from commit %s, \
+                             which is not in this view" [shortids $id]]
+        }
     } else {
-	puts "oops couldn't parse git blame output"
+        puts "oops couldn't parse git blame output"
     }
     return 0
 }
@@ -3961,11 +3979,11 @@
 proc delete_at_eof {f dir} {
     while {[gets $f line] >= 0} {}
     if {[eof $f]} {
-	if {[catch {close $f} err]} {
-	    error_popup "[mc "External diff viewer failed:"] $err"
-	}
-	file delete -force $dir
-	return 0
+        if {[catch {close $f} err]} {
+            error_popup "[mc "External diff viewer failed:"] $err"
+        }
+        file delete -force $dir
+        return 0
     }
     return 1
 }
@@ -3974,13 +3992,13 @@
 
 proc shellquote {str} {
     if {![string match "*\['\"\\ \t]*" $str]} {
-	return $str
+        return $str
     }
     if {![string match "*\['\"\\]*" $str]} {
-	return "\"$str\""
+        return "\"$str\""
     }
     if {![string match "*'*" $str]} {
-	return "'$str'"
+        return "'$str'"
     }
     return "\"[string map {\" \\\" \\ \\\\} $str]\""
 }
@@ -3988,10 +4006,10 @@
 proc shellarglist {l} {
     set str {}
     foreach a $l {
-	if {$str ne {}} {
-	    append str " "
-	}
-	append str [shellquote $a]
+        if {$str ne {}} {
+            append str " "
+        }
+        append str [shellquote $a]
     }
     return $str
 }
@@ -4000,52 +4018,52 @@
     set ret {}
     set used -1
     while {1} {
-	incr used
-	if {![regexp -start $used -indices "\['\"\\\\ \t]" $str first]} {
-	    append ret [string range $str $used end]
-	    set used [string length $str]
-	    break
-	}
-	set first [lindex $first 0]
-	set ch [string index $str $first]
-	if {$first > $used} {
-	    append ret [string range $str $used [expr {$first - 1}]]
-	    set used $first
-	}
-	if {$ch eq " " || $ch eq "\t"} break
-	incr used
-	if {$ch eq "'"} {
-	    set first [string first "'" $str $used]
-	    if {$first < 0} {
-		error "unmatched single-quote"
-	    }
-	    append ret [string range $str $used [expr {$first - 1}]]
-	    set used $first
-	    continue
-	}
-	if {$ch eq "\\"} {
-	    if {$used >= [string length $str]} {
-		error "trailing backslash"
-	    }
-	    append ret [string index $str $used]
-	    continue
-	}
-	# here ch == "\""
-	while {1} {
-	    if {![regexp -start $used -indices "\[\"\\\\]" $str first]} {
-		error "unmatched double-quote"
-	    }
-	    set first [lindex $first 0]
-	    set ch [string index $str $first]
-	    if {$first > $used} {
-		append ret [string range $str $used [expr {$first - 1}]]
-		set used $first
-	    }
-	    if {$ch eq "\""} break
-	    incr used
-	    append ret [string index $str $used]
-	    incr used
-	}
+        incr used
+        if {![regexp -start $used -indices "\['\"\\\\ \t]" $str first]} {
+            append ret [string range $str $used end]
+            set used [string length $str]
+            break
+        }
+        set first [lindex $first 0]
+        set ch [string index $str $first]
+        if {$first > $used} {
+            append ret [string range $str $used [expr {$first - 1}]]
+            set used $first
+        }
+        if {$ch eq " " || $ch eq "\t"} break
+        incr used
+        if {$ch eq "'"} {
+            set first [string first "'" $str $used]
+            if {$first < 0} {
+                error "unmatched single-quote"
+            }
+            append ret [string range $str $used [expr {$first - 1}]]
+            set used $first
+            continue
+        }
+        if {$ch eq "\\"} {
+            if {$used >= [string length $str]} {
+                error "trailing backslash"
+            }
+            append ret [string index $str $used]
+            continue
+        }
+        # here ch == "\""
+        while {1} {
+            if {![regexp -start $used -indices "\[\"\\\\]" $str first]} {
+                error "unmatched double-quote"
+            }
+            set first [lindex $first 0]
+            set ch [string index $str $first]
+            if {$first > $used} {
+                append ret [string range $str $used [expr {$first - 1}]]
+                set used $first
+            }
+            if {$ch eq "\""} break
+            incr used
+            append ret [string index $str $used]
+            incr used
+        }
     }
     return [list $used $ret]
 }
@@ -4053,13 +4071,13 @@
 proc shellsplit {str} {
     set l {}
     while {1} {
-	set str [string trimleft $str]
-	if {$str eq {}} break
-	set dq [shelldequote $str]
-	set n [lindex $dq 0]
-	set word [lindex $dq 1]
-	set str [string range $str $n end]
-	lappend l $word
+        set str [string trimleft $str]
+        if {$str eq {}} break
+        set dq [shelldequote $str]
+        set n [lindex $dq 0]
+        set word [lindex $dq 1]
+        set str [string range $str $n end]
+        lappend l $word
     }
     return $l
 }
@@ -4068,11 +4086,11 @@
     global appname curview viewname vrevs
     set rev [mc "All files"]
     if {$curview ne 0} {
-	if {$viewname($curview) eq [mc "Command line"]} {
-	    set rev [string map {"--gitk-symmetric-diff-marker" "--merge"} $vrevs($curview)]
-	} else {
-	    set rev $viewname($curview)
-	}
+        if {$viewname($curview) eq [mc "Command line"]} {
+            set rev [string map {"--gitk-symmetric-diff-marker" "--merge"} $vrevs($curview)]
+        } else {
+            set rev $viewname($curview)
+        }
     }
     wm title . "[reponame]: $rev - $appname"
 }
@@ -4086,8 +4104,8 @@
     set newishighlight $ishighlight
     set top .gitkview
     if {[winfo exists $top]} {
-	raise $top
-	return
+        raise $top
+        return
     }
     decode_view_opts $nextviewnum $revtreeargs
     set newviewname($nextviewnum) "[mc "View"] $nextviewnum"
@@ -4136,29 +4154,29 @@
 
     set rargs [list]
     foreach opt $known_view_options {
-	set patterns [lindex $opt 3]
-	if {$patterns eq {}} continue
-	set pattern [lindex $patterns 0]
+        set patterns [lindex $opt 3]
+        if {$patterns eq {}} continue
+        set pattern [lindex $patterns 0]
 
-	if {[lindex $opt 1] eq "b"} {
-	    set val $newviewopts($n,[lindex $opt 0])
-	    if {$val} {
-		lappend rargs $pattern
-	    }
-	} elseif {[regexp {^r(\d+)$} [lindex $opt 1] type value]} {
-	    regexp {^(.*_)} [lindex $opt 0] uselessvar button_id
-	    set val $newviewopts($n,$button_id)
-	    if {$val eq $value} {
-		lappend rargs $pattern
-	    }
-	} else {
-	    set val $newviewopts($n,[lindex $opt 0])
-	    set val [string trim $val]
-	    if {$val ne {}} {
-		set pfix [string range $pattern 0 end-1]
-		lappend rargs $pfix$val
-	    }
-	}
+        if {[lindex $opt 1] eq "b"} {
+            set val $newviewopts($n,[lindex $opt 0])
+            if {$val} {
+                lappend rargs $pattern
+            }
+        } elseif {[regexp {^r(\d+)$} [lindex $opt 1] type value]} {
+            regexp {^(.*_)} [lindex $opt 0] uselessvar button_id
+            set val $newviewopts($n,$button_id)
+            if {$val eq $value} {
+                lappend rargs $pattern
+            }
+        } else {
+            set val $newviewopts($n,[lindex $opt 0])
+            set val [string trim $val]
+            if {$val ne {}} {
+                set pfix [string range $pattern 0 end-1]
+                lappend rargs $pfix$val
+            }
+        }
     }
     set rargs [concat $rargs [shellsplit $newviewopts($n,refs)]]
     return [concat $rargs [shellsplit $newviewopts($n,args)]]
@@ -4169,59 +4187,59 @@
     global known_view_options newviewopts
 
     foreach opt $known_view_options {
-	set id [lindex $opt 0]
-	if {[lindex $opt 1] eq "b"} {
-	    # Checkboxes
-	    set val 0
+        set id [lindex $opt 0]
+        if {[lindex $opt 1] eq "b"} {
+            # Checkboxes
+            set val 0
         } elseif {[regexp {^r(\d+)$} [lindex $opt 1]]} {
-	    # Radiobuttons
-	    regexp {^(.*_)} $id uselessvar id
-	    set val 0
-	} else {
-	    # Text fields
-	    set val {}
-	}
-	set newviewopts($n,$id) $val
+            # Radiobuttons
+            regexp {^(.*_)} $id uselessvar id
+            set val 0
+        } else {
+            # Text fields
+            set val {}
+        }
+        set newviewopts($n,$id) $val
     }
     set oargs [list]
     set refargs [list]
     foreach arg $view_args {
-	if {[regexp -- {^-([0-9]+)$} $arg arg cnt]
-	    && ![info exists found(limit)]} {
-	    set newviewopts($n,limit) $cnt
-	    set found(limit) 1
-	    continue
-	}
-	catch { unset val }
-	foreach opt $known_view_options {
-	    set id [lindex $opt 0]
-	    if {[info exists found($id)]} continue
-	    foreach pattern [lindex $opt 3] {
-		if {![string match $pattern $arg]} continue
-		if {[lindex $opt 1] eq "b"} {
-		    # Check buttons
-		    set val 1
-		} elseif {[regexp {^r(\d+)$} [lindex $opt 1] match num]} {
-		    # Radio buttons
-		    regexp {^(.*_)} $id uselessvar id
-		    set val $num
-		} else {
-		    # Text input fields
-		    set size [string length $pattern]
-		    set val [string range $arg [expr {$size-1}] end]
-		}
-		set newviewopts($n,$id) $val
-		set found($id) 1
-		break
-	    }
-	    if {[info exists val]} break
-	}
-	if {[info exists val]} continue
-	if {[regexp {^-} $arg]} {
-	    lappend oargs $arg
-	} else {
-	    lappend refargs $arg
-	}
+        if {[regexp -- {^-([0-9]+)$} $arg arg cnt]
+            && ![info exists found(limit)]} {
+            set newviewopts($n,limit) $cnt
+            set found(limit) 1
+            continue
+        }
+        catch { unset val }
+        foreach opt $known_view_options {
+            set id [lindex $opt 0]
+            if {[info exists found($id)]} continue
+            foreach pattern [lindex $opt 3] {
+                if {![string match $pattern $arg]} continue
+                if {[lindex $opt 1] eq "b"} {
+                    # Check buttons
+                    set val 1
+                } elseif {[regexp {^r(\d+)$} [lindex $opt 1] match num]} {
+                    # Radio buttons
+                    regexp {^(.*_)} $id uselessvar id
+                    set val $num
+                } else {
+                    # Text input fields
+                    set size [string length $pattern]
+                    set val [string range $arg [expr {$size-1}] end]
+                }
+                set newviewopts($n,$id) $val
+                set found($id) 1
+                break
+            }
+            if {[info exists val]} break
+        }
+        if {[info exists val]} continue
+        if {[regexp {^-} $arg]} {
+            lappend oargs $arg
+        } else {
+            lappend refargs $arg
+        }
     }
     set newviewopts($n,refs) [shellarglist $refargs]
     set newviewopts($n,args) [shellarglist $oargs]
@@ -4231,9 +4249,9 @@
     global curview
 
     if {$curview > 0} {
-	editview
+        editview
     } else {
-	newview 0
+        newview 0
     }
 }
 
@@ -4244,8 +4262,8 @@
 
     set top .gitkvedit-$curview
     if {[winfo exists $top]} {
-	raise $top
-	return
+        raise $top
+        return
     }
     decode_view_opts $curview $viewargs($curview)
     set newviewname($curview)      $viewname($curview)
@@ -4275,66 +4293,66 @@
     set cexpand 0
     set cnt 0
     foreach opt $known_view_options {
-	set id [lindex $opt 0]
-	set type [lindex $opt 1]
-	set flags [lindex $opt 2]
-	set title [eval [lindex $opt 4]]
-	set lxpad 0
+        set id [lindex $opt 0]
+        set type [lindex $opt 1]
+        set flags [lindex $opt 2]
+        set title [eval [lindex $opt 4]]
+        set lxpad 0
 
-	if {$flags eq "+" || $flags eq "*"} {
-	    set cframe $top.fr$cnt
-	    incr cnt
-	    ${NS}::frame $cframe
-	    pack $cframe -in $top -fill x -pady 3 -padx 3
-	    set cexpand [expr {$flags eq "*"}]
+        if {$flags eq "+" || $flags eq "*"} {
+            set cframe $top.fr$cnt
+            incr cnt
+            ${NS}::frame $cframe
+            pack $cframe -in $top -fill x -pady 3 -padx 3
+            set cexpand [expr {$flags eq "*"}]
         } elseif {$flags eq ".." || $flags eq "*."} {
-	    set cframe $top.fr$cnt
-	    incr cnt
-	    ${NS}::frame $cframe
-	    pack $cframe -in $top -fill x -pady 3 -padx [list 15 3]
-	    set cexpand [expr {$flags eq "*."}]
-	} else {
-	    set lxpad 5
-	}
+            set cframe $top.fr$cnt
+            incr cnt
+            ${NS}::frame $cframe
+            pack $cframe -in $top -fill x -pady 3 -padx [list 15 3]
+            set cexpand [expr {$flags eq "*."}]
+        } else {
+            set lxpad 5
+        }
 
-	if {$type eq "l"} {
+        if {$type eq "l"} {
             ${NS}::label $cframe.l_$id -text $title
             pack $cframe.l_$id -in $cframe -side left -pady [list 3 0] -anchor w
-	} elseif {$type eq "b"} {
-	    ${NS}::checkbutton $cframe.c_$id -text $title -variable newviewopts($n,$id)
-	    pack $cframe.c_$id -in $cframe -side left \
-		-padx [list $lxpad 0] -expand $cexpand -anchor w
-	} elseif {[regexp {^r(\d+)$} $type type sz]} {
-	    regexp {^(.*_)} $id uselessvar button_id
-	    ${NS}::radiobutton $cframe.c_$id -text $title -variable newviewopts($n,$button_id) -value $sz
-	    pack $cframe.c_$id -in $cframe -side left \
-		-padx [list $lxpad 0] -expand $cexpand -anchor w
-	} elseif {[regexp {^t(\d+)$} $type type sz]} {
-	    ${NS}::label $cframe.l_$id -text $title
-	    ${NS}::entry $cframe.e_$id -width $sz -background $bgcolor \
-		-textvariable newviewopts($n,$id)
-	    pack $cframe.l_$id -in $cframe -side left -padx [list $lxpad 0]
-	    pack $cframe.e_$id -in $cframe -side left -expand 1 -fill x
-	} elseif {[regexp {^t(\d+)=$} $type type sz]} {
-	    ${NS}::label $cframe.l_$id -text $title
-	    ${NS}::entry $cframe.e_$id -width $sz -background $bgcolor \
-		-textvariable newviewopts($n,$id)
-	    pack $cframe.l_$id -in $cframe -side top -pady [list 3 0] -anchor w
-	    pack $cframe.e_$id -in $cframe -side top -fill x
-	} elseif {$type eq "path"} {
-	    ${NS}::label $top.l -text $title
-	    pack $top.l -in $top -side top -pady [list 3 0] -anchor w -padx 3
-	    text $top.t -width 40 -height 5 -background $bgcolor
-	    if {[info exists viewfiles($n)]} {
-		foreach f $viewfiles($n) {
-		    $top.t insert end $f
-		    $top.t insert end "\n"
-		}
-		$top.t delete {end - 1c} end
-		$top.t mark set insert 0.0
-	    }
-	    pack $top.t -in $top -side top -pady [list 0 5] -fill both -expand 1 -padx 3
-	}
+        } elseif {$type eq "b"} {
+            ${NS}::checkbutton $cframe.c_$id -text $title -variable newviewopts($n,$id)
+            pack $cframe.c_$id -in $cframe -side left \
+                -padx [list $lxpad 0] -expand $cexpand -anchor w
+        } elseif {[regexp {^r(\d+)$} $type type sz]} {
+            regexp {^(.*_)} $id uselessvar button_id
+            ${NS}::radiobutton $cframe.c_$id -text $title -variable newviewopts($n,$button_id) -value $sz
+            pack $cframe.c_$id -in $cframe -side left \
+                -padx [list $lxpad 0] -expand $cexpand -anchor w
+        } elseif {[regexp {^t(\d+)$} $type type sz]} {
+            ${NS}::label $cframe.l_$id -text $title
+            ${NS}::entry $cframe.e_$id -width $sz -background $bgcolor \
+                -textvariable newviewopts($n,$id)
+            pack $cframe.l_$id -in $cframe -side left -padx [list $lxpad 0]
+            pack $cframe.e_$id -in $cframe -side left -expand 1 -fill x
+        } elseif {[regexp {^t(\d+)=$} $type type sz]} {
+            ${NS}::label $cframe.l_$id -text $title
+            ${NS}::entry $cframe.e_$id -width $sz -background $bgcolor \
+                -textvariable newviewopts($n,$id)
+            pack $cframe.l_$id -in $cframe -side top -pady [list 3 0] -anchor w
+            pack $cframe.e_$id -in $cframe -side top -fill x
+        } elseif {$type eq "path"} {
+            ${NS}::label $top.l -text $title
+            pack $top.l -in $top -side top -pady [list 3 0] -anchor w -padx 3
+            text $top.t -width 40 -height 5 -background $bgcolor
+            if {[info exists viewfiles($n)]} {
+                foreach f $viewfiles($n) {
+                    $top.t insert end $f
+                    $top.t insert end "\n"
+                }
+                $top.t delete {end - 1c} end
+                $top.t mark set insert 0.0
+            }
+            pack $top.t -in $top -side top -pady [list 0 5] -fill both -expand 1 -padx 3
+        }
     }
 
     ${NS}::frame $top.buts
@@ -4355,10 +4373,10 @@
 proc doviewmenu {m first cmd op argv} {
     set nmenu [$m index end]
     for {set i $first} {$i <= $nmenu} {incr i} {
-	if {[$m entrycget $i -command] eq $cmd} {
-	    eval $m $op $i $argv
-	    break
-	}
+        if {[$m entrycget $i -command] eq $cmd} {
+            eval $m $op $i $argv
+            break
+        }
     }
 }
 
@@ -4375,53 +4393,53 @@
     global viewargs viewargscmd newviewopts viewhlmenu
 
     if {[catch {
-	set newargs [encode_view_opts $n]
+        set newargs [encode_view_opts $n]
     } err]} {
-	error_popup "[mc "Error in commit selection arguments:"] $err" $top
-	return
+        error_popup "[mc "Error in commit selection arguments:"] $err" $top
+        return
     }
     set files {}
     foreach f [split [$top.t get 0.0 end] "\n"] {
-	set ft [string trim $f]
-	if {$ft ne {}} {
-	    lappend files $ft
-	}
+        set ft [string trim $f]
+        if {$ft ne {}} {
+            lappend files $ft
+        }
     }
     if {![info exists viewfiles($n)]} {
-	# creating a new view
-	incr nextviewnum
-	set viewname($n) $newviewname($n)
-	set viewperm($n) $newviewopts($n,perm)
-	set viewchanged($n) 1
-	set viewfiles($n) $files
-	set viewargs($n) $newargs
-	set viewargscmd($n) $newviewopts($n,cmd)
-	addviewmenu $n
-	if {!$newishighlight} {
-	    run showview $n
-	} else {
-	    run addvhighlight $n
-	}
+        # creating a new view
+        incr nextviewnum
+        set viewname($n) $newviewname($n)
+        set viewperm($n) $newviewopts($n,perm)
+        set viewchanged($n) 1
+        set viewfiles($n) $files
+        set viewargs($n) $newargs
+        set viewargscmd($n) $newviewopts($n,cmd)
+        addviewmenu $n
+        if {!$newishighlight} {
+            run showview $n
+        } else {
+            run addvhighlight $n
+        }
     } else {
-	# editing an existing view
-	set viewperm($n) $newviewopts($n,perm)
-	set viewchanged($n) 1
-	if {$newviewname($n) ne $viewname($n)} {
-	    set viewname($n) $newviewname($n)
-	    doviewmenu .bar.view 5 [list showview $n] \
-		entryconf [list -label $viewname($n)]
-	    # doviewmenu $viewhlmenu 1 [list addvhighlight $n] \
-		# entryconf [list -label $viewname($n) -value $viewname($n)]
-	}
-	if {$files ne $viewfiles($n) || $newargs ne $viewargs($n) || \
-		$newviewopts($n,cmd) ne $viewargscmd($n)} {
-	    set viewfiles($n) $files
-	    set viewargs($n) $newargs
-	    set viewargscmd($n) $newviewopts($n,cmd)
-	    if {$curview == $n} {
-		run reloadcommits
-	    }
-	}
+        # editing an existing view
+        set viewperm($n) $newviewopts($n,perm)
+        set viewchanged($n) 1
+        if {$newviewname($n) ne $viewname($n)} {
+            set viewname($n) $newviewname($n)
+            doviewmenu .bar.view 5 [list showview $n] \
+                entryconf [list -label $viewname($n)]
+            # doviewmenu $viewhlmenu 1 [list addvhighlight $n] \
+                # entryconf [list -label $viewname($n) -value $viewname($n)]
+        }
+        if {$files ne $viewfiles($n) || $newargs ne $viewargs($n) || \
+                $newviewopts($n,cmd) ne $viewargscmd($n)} {
+            set viewfiles($n) $files
+            set viewargs($n) $newargs
+            set viewargscmd($n) $newviewopts($n,cmd)
+            if {$curview == $n} {
+                run reloadcommits
+            }
+        }
     }
     if {$apply} return
     catch {destroy $top}
@@ -4432,8 +4450,8 @@
 
     if {$curview == 0} return
     if {[info exists hlview] && $hlview == $curview} {
-	set selectedhlview [mc "None"]
-	unset hlview
+        set selectedhlview [mc "None"]
+        unset hlview
     }
     allviewmenus $curview delete
     set viewperm($curview) 0
@@ -4445,7 +4463,7 @@
     global viewname viewhlmenu
 
     .bar.view add radiobutton -label $viewname($n) \
-	-command [list showview $n] -variable selectedview -value $n
+        -command [list showview $n] -variable selectedview -value $n
     #$viewhlmenu add radiobutton -label $viewname($n) \
     #	-command [list addvhighlight $n] -variable selectedhlview
 }
@@ -4470,22 +4488,22 @@
     set ybot [expr {[lindex $span 1] * $ymax}]
     set yscreen [expr {($ybot - $ytop) / 2}]
     if {$selectedline ne {}} {
-	set selid $currentid
-	set y [yc $selectedline]
-	if {$ytop < $y && $y < $ybot} {
-	    set yscreen [expr {$y - $ytop}]
-	}
+        set selid $currentid
+        set y [yc $selectedline]
+        if {$ytop < $y && $y < $ybot} {
+            set yscreen [expr {$y - $ytop}]
+        }
     } elseif {[info exists pending_select]} {
-	set selid $pending_select
-	unset pending_select
+        set selid $pending_select
+        unset pending_select
     }
     unselectline
     normalline
     unset -nocomplain treediffs
     clear_display
     if {[info exists hlview] && $hlview == $n} {
-	unset hlview
-	set selectedhlview [mc "None"]
+        unset hlview
+        set selectedhlview [mc "None"]
     }
     unset -nocomplain commitinterest
     unset -nocomplain cached_commitrow
@@ -4498,8 +4516,8 @@
 
     run refill_reflist
     if {![info exists viewcomplete($n)]} {
-	getcommits $selid
-	return
+        getcommits $selid
+        return
     }
 
     set displayorder {}
@@ -4519,39 +4537,39 @@
     set yf 0
     set row {}
     if {$selid ne {} && [commitinview $selid $n]} {
-	set row [rowofcommit $selid]
-	# try to get the selected row in the same position on the screen
-	set ymax [lindex [$canv cget -scrollregion] 3]
-	set ytop [expr {[yc $row] - $yscreen}]
-	if {$ytop < 0} {
-	    set ytop 0
-	}
-	set yf [expr {$ytop * 1.0 / $ymax}]
+        set row [rowofcommit $selid]
+        # try to get the selected row in the same position on the screen
+        set ymax [lindex [$canv cget -scrollregion] 3]
+        set ytop [expr {[yc $row] - $yscreen}]
+        if {$ytop < 0} {
+            set ytop 0
+        }
+        set yf [expr {$ytop * 1.0 / $ymax}]
     }
     allcanvs yview moveto $yf
     drawvisible
     if {$row ne {}} {
-	selectline $row 0
+        selectline $row 0
     } elseif {!$viewcomplete($n)} {
-	reset_pending_select $selid
+        reset_pending_select $selid
     } else {
-	reset_pending_select {}
+        reset_pending_select {}
 
-	if {[commitinview $pending_select $curview]} {
-	    selectline [rowofcommit $pending_select] 1
-	} else {
-	    set row [first_real_row]
-	    if {$row < $numcommits} {
-		selectline $row 0
-	    }
-	}
+        if {[commitinview $pending_select $curview]} {
+            selectline [rowofcommit $pending_select] 1
+        } else {
+            set row [first_real_row]
+            if {$row < $numcommits} {
+                selectline $row 0
+            }
+        }
     }
     if {!$viewcomplete($n)} {
-	if {$numcommits == 0} {
-	    show_status [mc "Reading commits..."]
-	}
+        if {$numcommits == 0} {
+            show_status [mc "Reading commits..."]
+        }
     } elseif {$numcommits == 0} {
-	show_status [mc "No commits selected"]
+        show_status [mc "No commits selected"]
     }
     set_window_title
 }
@@ -4562,16 +4580,16 @@
     global vhighlights fhighlights nhighlights rhighlights
 
     if {[info exists nhighlights($id)] && $nhighlights($id) > 0} {
-	return $nhighlights($id)
+        return $nhighlights($id)
     }
     if {[info exists vhighlights($id)] && $vhighlights($id) > 0} {
-	return $vhighlights($id)
+        return $vhighlights($id)
     }
     if {[info exists fhighlights($id)] && $fhighlights($id) > 0} {
-	return $fhighlights($id)
+        return $fhighlights($id)
     }
     if {[info exists rhighlights($id)] && $rhighlights($id) > 0} {
-	return $rhighlights($id)
+        return $rhighlights($id)
     }
     return 0
 }
@@ -4584,14 +4602,14 @@
     lappend boldids $id
     $canv itemconf $linehtag($id) -font $font
     if {[info exists currentid] && $id eq $currentid} {
-	$canv delete secsel
-	set t [eval $canv create rect [$canv bbox $linehtag($id)] \
-		   -outline {{}} -tags secsel \
-		   -fill [$canv cget -selectbackground]]
-	$canv lower $t
+        $canv delete secsel
+        set t [eval $canv create rect [$canv bbox $linehtag($id)] \
+                   -outline {{}} -tags secsel \
+                   -fill [$canv cget -selectbackground]]
+        $canv lower $t
     }
     if {[info exists markedid] && $id eq $markedid} {
-	make_idmark $id
+        make_idmark $id
     }
 }
 
@@ -4602,11 +4620,11 @@
     lappend boldnameids $id
     $canv2 itemconf $linentag($id) -font $font
     if {[info exists currentid] && $id eq $currentid} {
-	$canv2 delete secsel
-	set t [eval $canv2 create rect [$canv2 bbox $linentag($id)] \
-		   -outline {{}} -tags secsel \
-		   -fill [$canv2 cget -selectbackground]]
-	$canv2 lower $t
+        $canv2 delete secsel
+        set t [eval $canv2 create rect [$canv2 bbox $linentag($id)] \
+                   -outline {{}} -tags secsel \
+                   -fill [$canv2 cget -selectbackground]]
+        $canv2 lower $t
     }
 }
 
@@ -4615,11 +4633,11 @@
 
     set stillbold {}
     foreach id $boldids {
-	if {![ishighlighted $id]} {
-	    bolden $id mainfont
-	} else {
-	    lappend stillbold $id
-	}
+        if {![ishighlighted $id]} {
+            bolden $id mainfont
+        } else {
+            lappend stillbold $id
+        }
     }
     set boldids $stillbold
 }
@@ -4628,15 +4646,15 @@
     global hlview viewcomplete curview vhl_done commitidx
 
     if {[info exists hlview]} {
-	delvhighlight
+        delvhighlight
     }
     set hlview $n
     if {$n != $curview && ![info exists viewcomplete($n)]} {
-	start_rev_list $n
+        start_rev_list $n
     }
     set vhl_done $commitidx($hlview)
     if {$vhl_done > 0} {
-	drawvisible
+        drawvisible
     }
 }
 
@@ -4657,16 +4675,16 @@
     set r0 [lindex $vr 0]
     set r1 [lindex $vr 1]
     for {set i $vhl_done} {$i < $max} {incr i} {
-	set id [commitonrow $i $hlview]
-	if {[commitinview $id $curview]} {
-	    set row [rowofcommit $id]
-	    if {$r0 <= $row && $row <= $r1} {
-		if {![highlighted $row]} {
-		    bolden $id mainfontbold
-		}
-		set vhighlights($id) 1
-	    }
-	}
+        set id [commitonrow $i $hlview]
+        if {[commitinview $id $curview]} {
+            set row [rowofcommit $id]
+            if {$r0 <= $row && $row <= $r1} {
+                if {![highlighted $row]} {
+                    bolden $id mainfontbold
+                }
+                set vhighlights($id) 1
+            }
+        }
     }
     set vhl_done $max
     return 0
@@ -4676,12 +4694,12 @@
     global hlview vhighlights iddrawn
 
     if {[commitinview $id $hlview]} {
-	if {[info exists iddrawn($id)] && ![ishighlighted $id]} {
-	    bolden $id mainfontbold
-	}
-	set vhighlights($id) 1
+        if {[info exists iddrawn($id)] && ![ishighlighted $id]} {
+            bolden $id mainfontbold
+        }
+        set vhighlights($id) 1
     } else {
-	set vhighlights($id) 0
+        set vhighlights($id) 0
     }
 }
 
@@ -4690,18 +4708,18 @@
     global highlight_paths
 
     if {[info exists filehighlight]} {
-	# delete previous highlights
-	catch {close $filehighlight}
-	unset filehighlight
-	unset -nocomplain fhighlights
-	unbolden
-	unhighlight_filelist
+        # delete previous highlights
+        catch {close $filehighlight}
+        unset filehighlight
+        unset -nocomplain fhighlights
+        unbolden
+        unhighlight_filelist
     }
     set highlight_paths {}
     after cancel do_file_hl $fh_serial
     incr fh_serial
     if {$highlight_files ne {}} {
-	after 300 do_file_hl $fh_serial
+        after 300 do_file_hl $fh_serial
     }
 }
 
@@ -4710,21 +4728,21 @@
 
     stopfinding
     if {$findstring ne {}} {
-	if {$gdttype eq [mc "containing:"]} {
-	    if {$highlight_files ne {}} {
-		set highlight_files {}
-		hfiles_change
-	    }
-	    findcom_change
-	} else {
-	    if {$findpattern ne {}} {
-		set findpattern {}
-		findcom_change
-	    }
-	    set highlight_files $findstring
-	    hfiles_change
-	}
-	drawvisible
+        if {$gdttype eq [mc "containing:"]} {
+            if {$highlight_files ne {}} {
+                set highlight_files {}
+                hfiles_change
+            }
+            findcom_change
+        } else {
+            if {$findpattern ne {}} {
+                set findpattern {}
+                findcom_change
+            }
+            set highlight_files $findstring
+            hfiles_change
+        }
+        drawvisible
     }
     # enable/disable findtype/findloc menus too
 }
@@ -4734,12 +4752,12 @@
 
     stopfinding
     if {$gdttype eq [mc "containing:"]} {
-	findcom_change
+        findcom_change
     } else {
-	if {$highlight_files ne $findstring} {
-	    set highlight_files $findstring
-	    hfiles_change
-	}
+        if {$highlight_files ne $findstring} {
+            set highlight_files $findstring
+            hfiles_change
+        }
     }
     drawvisible
 }
@@ -4751,33 +4769,33 @@
     stopfinding
     # delete previous highlights, if any
     foreach id $boldnameids {
-	bolden_name $id mainfont
+        bolden_name $id mainfont
     }
     set boldnameids {}
     unset -nocomplain nhighlights
     unbolden
     unmarkmatches
     if {$gdttype ne [mc "containing:"] || $findstring eq {}} {
-	set findpattern {}
+        set findpattern {}
     } elseif {$findtype eq [mc "Regexp"]} {
-	set findpattern $findstring
+        set findpattern $findstring
     } else {
-	set e [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} \
-		   $findstring]
-	set findpattern "*$e*"
+        set e [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} \
+                   $findstring]
+        set findpattern "*$e*"
     }
 }
 
 proc makepatterns {l} {
     set ret {}
     foreach e $l {
-	set ee [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} $e]
-	if {[string index $ee end] eq "/"} {
-	    lappend ret "$ee*"
-	} else {
-	    lappend ret $ee
-	    lappend ret "$ee/*"
-	}
+        set ee [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} $e]
+        if {[string index $ee end] eq "/"} {
+            lappend ret "$ee*"
+        } else {
+            lappend ret $ee
+            lappend ret "$ee/*"
+        }
     }
     return $ret
 }
@@ -4787,26 +4805,26 @@
     global cdup findtype
 
     if {$gdttype eq [mc "touching paths:"]} {
-	# If "exact" match then convert backslashes to forward slashes.
-	# Most useful to support Windows-flavoured file paths.
-	if {$findtype eq [mc "Exact"]} {
-	    set highlight_files [string map {"\\" "/"} $highlight_files]
-	}
-	if {[catch {set paths [shellsplit $highlight_files]}]} return
-	set highlight_paths [makepatterns $paths]
-	highlight_filelist
-	set relative_paths {}
-	foreach path $paths {
-	    lappend relative_paths [file join $cdup $path]
-	}
-	set gdtargs [concat -- $relative_paths]
+        # If "exact" match then convert backslashes to forward slashes.
+        # Most useful to support Windows-flavoured file paths.
+        if {$findtype eq [mc "Exact"]} {
+            set highlight_files [string map {"\\" "/"} $highlight_files]
+        }
+        if {[catch {set paths [shellsplit $highlight_files]}]} return
+        set highlight_paths [makepatterns $paths]
+        highlight_filelist
+        set relative_paths {}
+        foreach path $paths {
+            lappend relative_paths [file join $cdup $path]
+        }
+        set gdtargs [concat -- $relative_paths]
     } elseif {$gdttype eq [mc "adding/removing string:"]} {
-	set gdtargs [list "-S$highlight_files"]
+        set gdtargs [list "-S$highlight_files"]
     } elseif {$gdttype eq [mc "changing lines matching:"]} {
-	set gdtargs [list "-G$highlight_files"]
+        set gdtargs [list "-G$highlight_files"]
     } else {
-	# must be "containing:", i.e. we're searching commit info
-	return
+        # must be "containing:", i.e. we're searching commit info
+        return
     }
     set cmd [concat | git diff-tree -r -s --stdin $gdtargs]
     set filehighlight [open $cmd r+]
@@ -4821,9 +4839,9 @@
     global filehighlight fhl_list
 
     if {[info exists filehighlight]} {
-	lappend fhl_list {}
-	puts $filehighlight ""
-	flush $filehighlight
+        lappend fhl_list {}
+        puts $filehighlight ""
+        flush $filehighlight
     }
 }
 
@@ -4840,34 +4858,34 @@
     global fhl_list find_dirn
 
     if {![info exists filehighlight]} {
-	return 0
+        return 0
     }
     set nr 0
     while {[incr nr] <= 100 && [gets $filehighlight line] >= 0} {
-	set line [string trim $line]
-	set i [lsearch -exact $fhl_list $line]
-	if {$i < 0} continue
-	for {set j 0} {$j < $i} {incr j} {
-	    set id [lindex $fhl_list $j]
-	    set fhighlights($id) 0
-	}
-	set fhl_list [lrange $fhl_list [expr {$i+1}] end]
-	if {$line eq {}} continue
-	if {![commitinview $line $curview]} continue
-	if {[info exists iddrawn($line)] && ![ishighlighted $line]} {
-	    bolden $line mainfontbold
-	}
-	set fhighlights($line) 1
+        set line [string trim $line]
+        set i [lsearch -exact $fhl_list $line]
+        if {$i < 0} continue
+        for {set j 0} {$j < $i} {incr j} {
+            set id [lindex $fhl_list $j]
+            set fhighlights($id) 0
+        }
+        set fhl_list [lrange $fhl_list [expr {$i+1}] end]
+        if {$line eq {}} continue
+        if {![commitinview $line $curview]} continue
+        if {[info exists iddrawn($line)] && ![ishighlighted $line]} {
+            bolden $line mainfontbold
+        }
+        set fhighlights($line) 1
     }
     if {[eof $filehighlight]} {
-	# strange...
-	puts "oops, git diff-tree died"
-	catch {close $filehighlight}
-	unset filehighlight
-	return 0
+        # strange...
+        puts "oops, git diff-tree died"
+        catch {close $filehighlight}
+        unset filehighlight
+        return 0
     }
     if {[info exists find_dirn]} {
-	run findmore
+        run findmore
     }
     return 1
 }
@@ -4876,11 +4894,11 @@
     global findtype findpattern
 
     if {$findtype eq [mc "Regexp"]} {
-	return [regexp $findpattern $f]
+        return [regexp $findpattern $f]
     } elseif {$findtype eq [mc "IgnCase"]} {
-	return [string match -nocase $findpattern $f]
+        return [string match -nocase $findpattern $f]
     } else {
-	return [string match $findpattern $f]
+        return [string match $findpattern $f]
     }
 }
 
@@ -4890,32 +4908,32 @@
     global markingmatches
 
     if {![info exists commitinfo($id)]} {
-	getcommit $id
+        getcommit $id
     }
     set info $commitinfo($id)
     set isbold 0
     set fldtypes [list [mc Headline] [mc Author] "" [mc Committer] "" [mc Comments]]
     foreach f $info ty $fldtypes {
-	if {$ty eq ""} continue
-	if {($findloc eq [mc "All fields"] || $findloc eq $ty) &&
-	    [doesmatch $f]} {
-	    if {$ty eq [mc "Author"]} {
-		set isbold 2
-		break
-	    }
-	    set isbold 1
-	}
+        if {$ty eq ""} continue
+        if {($findloc eq [mc "All fields"] || $findloc eq $ty) &&
+            [doesmatch $f]} {
+            if {$ty eq [mc "Author"]} {
+                set isbold 2
+                break
+            }
+            set isbold 1
+        }
     }
     if {$isbold && [info exists iddrawn($id)]} {
-	if {![ishighlighted $id]} {
-	    bolden $id mainfontbold
-	    if {$isbold > 1} {
-		bolden_name $id mainfontbold
-	    }
-	}
-	if {$markingmatches} {
-	    markrowmatches $row $id
-	}
+        if {![ishighlighted $id]} {
+            bolden $id mainfontbold
+            if {$isbold > 1} {
+                bolden_name $id mainfontbold
+            }
+        }
+        if {$markingmatches} {
+            markrowmatches $row $id
+        }
     }
     set nhighlights($id) $isbold
 }
@@ -4928,18 +4946,18 @@
     $canv delete match$row
     $canv2 delete match$row
     if {$findloc eq [mc "All fields"] || $findloc eq [mc "Headline"]} {
-	set m [findmatches $headline]
-	if {$m ne {}} {
-	    markmatches $canv $row $headline $linehtag($id) $m \
-		[$canv itemcget $linehtag($id) -font] $row
-	}
+        set m [findmatches $headline]
+        if {$m ne {}} {
+            markmatches $canv $row $headline $linehtag($id) $m \
+                [$canv itemcget $linehtag($id) -font] $row
+        }
     }
     if {$findloc eq [mc "All fields"] || $findloc eq [mc "Author"]} {
-	set m [findmatches $author]
-	if {$m ne {}} {
-	    markmatches $canv2 $row $author $linentag($id) $m \
-		[$canv2 itemcget $linentag($id) -font] $row
-	}
+        set m [findmatches $author]
+        if {$m ne {}} {
+            markmatches $canv2 $row $author $linentag($id) $m \
+                [$canv2 itemcget $linentag($id) -font] $row
+        }
     }
 }
 
@@ -4948,7 +4966,7 @@
 
     rhighlight_none
     if {$highlight_related ne [mc "None"]} {
-	run drawvisible
+        run drawvisible
     }
 }
 
@@ -4962,8 +4980,8 @@
     unset -nocomplain ancestor
     set anc_todo [list $a]
     if {$highlight_related ne [mc "None"]} {
-	rhighlight_none
-	run drawvisible
+        rhighlight_none
+        run drawvisible
     }
 }
 
@@ -4983,24 +5001,24 @@
     set leftover {}
     set done 0
     for {set i 0} {$i < [llength $todo]} {incr i} {
-	set do [lindex $todo $i]
-	if {[rowofcommit $do] < $la} {
-	    lappend leftover $do
-	    continue
-	}
-	foreach nk $children($v,$do) {
-	    if {![info exists descendent($nk)]} {
-		set descendent($nk) 1
-		lappend todo $nk
-		if {$nk eq $a} {
-		    set done 1
-		}
-	    }
-	}
-	if {$done} {
-	    set desc_todo [concat $leftover [lrange $todo [expr {$i+1}] end]]
-	    return
-	}
+        set do [lindex $todo $i]
+        if {[rowofcommit $do] < $la} {
+            lappend leftover $do
+            continue
+        }
+        foreach nk $children($v,$do) {
+            if {![info exists descendent($nk)]} {
+                set descendent($nk) 1
+                lappend todo $nk
+                if {$nk eq $a} {
+                    set done 1
+                }
+            }
+        }
+        if {$done} {
+            set desc_todo [concat $leftover [lrange $todo [expr {$i+1}] end]]
+            return
+        }
     }
     set descendent($a) 0
     set desc_todo $leftover
@@ -5015,24 +5033,24 @@
     set leftover {}
     set done 0
     for {set i 0} {$i < [llength $todo]} {incr i} {
-	set do [lindex $todo $i]
-	if {![commitinview $do $v] || [rowofcommit $do] > $la} {
-	    lappend leftover $do
-	    continue
-	}
-	foreach np $parents($v,$do) {
-	    if {![info exists ancestor($np)]} {
-		set ancestor($np) 1
-		lappend todo $np
-		if {$np eq $a} {
-		    set done 1
-		}
-	    }
-	}
-	if {$done} {
-	    set anc_todo [concat $leftover [lrange $todo [expr {$i+1}] end]]
-	    return
-	}
+        set do [lindex $todo $i]
+        if {![commitinview $do $v] || [rowofcommit $do] > $la} {
+            lappend leftover $do
+            continue
+        }
+        foreach np $parents($v,$do) {
+            if {![info exists ancestor($np)]} {
+                set ancestor($np) 1
+                lappend todo $np
+                if {$np eq $a} {
+                    set done 1
+                }
+            }
+        }
+        if {$done} {
+            set anc_todo [concat $leftover [lrange $todo [expr {$i+1}] end]]
+            return
+        }
     }
     set ancestor($a) 0
     set anc_todo $leftover
@@ -5045,26 +5063,26 @@
     if {$selectedline eq {}} return
     set isbold 0
     if {$highlight_related eq [mc "Descendant"] ||
-	$highlight_related eq [mc "Not descendant"]} {
-	if {![info exists descendent($id)]} {
-	    is_descendent $id
-	}
-	if {$descendent($id) == ($highlight_related eq [mc "Descendant"])} {
-	    set isbold 1
-	}
+        $highlight_related eq [mc "Not descendant"]} {
+        if {![info exists descendent($id)]} {
+            is_descendent $id
+        }
+        if {$descendent($id) == ($highlight_related eq [mc "Descendant"])} {
+            set isbold 1
+        }
     } elseif {$highlight_related eq [mc "Ancestor"] ||
-	      $highlight_related eq [mc "Not ancestor"]} {
-	if {![info exists ancestor($id)]} {
-	    is_ancestor $id
-	}
-	if {$ancestor($id) == ($highlight_related eq [mc "Ancestor"])} {
-	    set isbold 1
-	}
+              $highlight_related eq [mc "Not ancestor"]} {
+        if {![info exists ancestor($id)]} {
+            is_ancestor $id
+        }
+        if {$ancestor($id) == ($highlight_related eq [mc "Ancestor"])} {
+            set isbold 1
+        }
     }
     if {[info exists iddrawn($id)]} {
-	if {$isbold && ![ishighlighted $id]} {
-	    bolden $id mainfontbold
-	}
+        if {$isbold && ![ishighlighted $id]} {
+            bolden $id mainfontbold
+        }
     }
     set rhighlights($id) $isbold
 }
@@ -5074,13 +5092,13 @@
 proc shortids {ids} {
     set res {}
     foreach id $ids {
-	if {[llength $id] > 1} {
-	    lappend res [shortids $id]
-	} elseif {[regexp {^[0-9a-f]{40}$} $id]} {
-	    lappend res [string range $id 0 7]
-	} else {
-	    lappend res $id
-	}
+        if {[llength $id] > 1} {
+            lappend res [shortids $id]
+        } elseif {[regexp {^[0-9a-f]{40}$} $id]} {
+            lappend res [string range $id 0 7]
+        } else {
+            lappend res $id
+        }
     }
     return $res
 }
@@ -5089,10 +5107,10 @@
     set ret {}
     set o [list $o]
     for {set mask 1} {$mask <= $n} {incr mask $mask} {
-	if {($n & $mask) != 0} {
-	    set ret [concat $ret $o]
-	}
-	set o [concat $o $o]
+        if {($n & $mask) != 0} {
+            set ret [concat $ret $o]
+        }
+        set o [concat $o $o]
     }
     return $ret
 }
@@ -5102,41 +5120,41 @@
     global nullid nullid2
 
     if {[info exists ordertok($id)]} {
-	return $ordertok($id)
+        return $ordertok($id)
     }
     set origid $id
     set todo {}
     while {1} {
-	if {[info exists varcid($curview,$id)]} {
-	    set a $varcid($curview,$id)
-	    set p [lindex $varcstart($curview) $a]
-	} else {
-	    set p [lindex $children($curview,$id) 0]
-	}
-	if {[info exists ordertok($p)]} {
-	    set tok $ordertok($p)
-	    break
-	}
-	set id [first_real_child $curview,$p]
-	if {$id eq {}} {
-	    # it's a root
-	    set tok [lindex $varctok($curview) $varcid($curview,$p)]
-	    break
-	}
-	if {[llength $parents($curview,$id)] == 1} {
-	    lappend todo [list $p {}]
-	} else {
-	    set j [lsearch -exact $parents($curview,$id) $p]
-	    if {$j < 0} {
-		puts "oops didn't find [shortids $p] in parents of [shortids $id]"
-	    }
-	    lappend todo [list $p [strrep $j]]
-	}
+        if {[info exists varcid($curview,$id)]} {
+            set a $varcid($curview,$id)
+            set p [lindex $varcstart($curview) $a]
+        } else {
+            set p [lindex $children($curview,$id) 0]
+        }
+        if {[info exists ordertok($p)]} {
+            set tok $ordertok($p)
+            break
+        }
+        set id [first_real_child $curview,$p]
+        if {$id eq {}} {
+            # it's a root
+            set tok [lindex $varctok($curview) $varcid($curview,$p)]
+            break
+        }
+        if {[llength $parents($curview,$id)] == 1} {
+            lappend todo [list $p {}]
+        } else {
+            set j [lsearch -exact $parents($curview,$id) $p]
+            if {$j < 0} {
+                puts "oops didn't find [shortids $p] in parents of [shortids $id]"
+            }
+            lappend todo [list $p [strrep $j]]
+        }
     }
     for {set i [llength $todo]} {[incr i -1] >= 0} {} {
-	set p [lindex $todo $i 0]
-	append tok [lindex $todo $i 1]
-	set ordertok($p) $tok
+        set p [lindex $todo $i 0]
+        append tok [lindex $todo $i 1]
+        set ordertok($p) $tok
     }
     set ordertok($origid) $tok
     return $tok
@@ -5147,19 +5165,19 @@
 proc idcol {idlist id {i 0}} {
     set t [ordertoken $id]
     if {$i < 0} {
-	set i 0
+        set i 0
     }
     if {$i >= [llength $idlist] || $t < [ordertoken [lindex $idlist $i]]} {
-	if {$i > [llength $idlist]} {
-	    set i [llength $idlist]
-	}
-	while {[incr i -1] >= 0 && $t < [ordertoken [lindex $idlist $i]]} {}
-	incr i
+        if {$i > [llength $idlist]} {
+            set i [llength $idlist]
+        }
+        while {[incr i -1] >= 0 && $t < [ordertoken [lindex $idlist $i]]} {}
+        incr i
     } else {
-	if {$t > [ordertoken [lindex $idlist $i]]} {
-	    while {[incr i] < [llength $idlist] &&
-		   $t >= [ordertoken [lindex $idlist $i]]} {}
-	}
+        if {$t > [ordertoken [lindex $idlist $i]]} {
+            while {[incr i] < [llength $idlist] &&
+                   $t >= [ordertoken [lindex $idlist $i]]} {}
+        }
     }
     return $i
 }
@@ -5204,12 +5222,12 @@
     set y0 [expr {int([lindex $f 0] * $ymax)}]
     set r0 [expr {int(($y0 - 3) / $linespc) - 1}]
     if {$r0 < 0} {
-	set r0 0
+        set r0 0
     }
     set y1 [expr {int([lindex $f 1] * $ymax)}]
     set r1 [expr {int(($y1 - 3) / $linespc) + 1}]
     if {$r1 >= $numcommits} {
-	set r1 [expr {$numcommits - 1}]
+        set r1 [expr {$numcommits - 1}]
     }
     return [list $r0 $r1]
 }
@@ -5220,13 +5238,13 @@
     global lastscrollset lastscrollrows
 
     if {$lastscrollrows < 100 || $viewcomplete($curview) ||
-	[clock clicks -milliseconds] - $lastscrollset > 500} {
-	setcanvscroll
+        [clock clicks -milliseconds] - $lastscrollset > 500} {
+        setcanvscroll
     }
     if {[info exists pending_select] &&
-	[commitinview $pending_select $curview]} {
-	update
-	selectline [rowofcommit $pending_select] 1
+        [commitinview $pending_select $curview]} {
+        update
+        selectline [rowofcommit $pending_select] 1
     }
     drawvisible
 }
@@ -5238,13 +5256,13 @@
     global viewmainheadid vfilelimit viewinstances mainheadid
 
     catch {
-	set rfd [open [concat | git rev-list -1 $mainheadid \
-			   -- $vfilelimit($view)] r]
-	set j [reg_instance $rfd]
-	lappend viewinstances($view) $j
-	fconfigure $rfd -blocking 0
-	filerun $rfd [list getviewhead $rfd $j $view]
-	set viewmainheadid($curview) {}
+        set rfd [open [concat | git rev-list -1 $mainheadid \
+                           -- $vfilelimit($view)] r]
+        set j [reg_instance $rfd]
+        lappend viewinstances($view) $j
+        fconfigure $rfd -blocking 0
+        filerun $rfd [list getviewhead $rfd $j $view]
+        set viewmainheadid($curview) {}
     }
 }
 
@@ -5254,21 +5272,21 @@
 
     set id {}
     if {[gets $fd line] < 0} {
-	if {![eof $fd]} {
-	    return 1
-	}
+        if {![eof $fd]} {
+            return 1
+        }
     } elseif {[string length $line] == 40 && [string is xdigit $line]} {
-	set id $line
+        set id $line
     }
     set viewmainheadid($view) $id
     close $fd
     unset commfd($inst)
     set i [lsearch -exact $viewinstances($view) $inst]
     if {$i >= 0} {
-	set viewinstances($view) [lreplace $viewinstances($view) $i $i]
+        set viewinstances($view) [lreplace $viewinstances($view) $i $i]
     }
     if {$showlocalchanges && $id ne {} && $view == $curview} {
-	doshowlocalchanges
+        doshowlocalchanges
     }
     return 0
 }
@@ -5278,9 +5296,9 @@
 
     if {$viewmainheadid($curview) eq {}} return
     if {[commitinview $viewmainheadid($curview) $curview]} {
-	dodiffindex
+        dodiffindex
     } else {
-	interestedin $viewmainheadid($curview) dodiffindex
+        interestedin $viewmainheadid($curview) dodiffindex
     }
 }
 
@@ -5288,10 +5306,10 @@
     global nullid nullid2 lserial curview
 
     if {[commitinview $nullid $curview]} {
-	removefakerow $nullid
+        removefakerow $nullid
     }
     if {[commitinview $nullid2 $curview]} {
-	removefakerow $nullid2
+        removefakerow $nullid2
     }
     incr lserial
 }
@@ -5304,12 +5322,12 @@
     if {!$showlocalchanges || !$hasworktree} return
     incr lserial
     if {[package vcompare $git_version "1.7.2"] >= 0} {
-	set cmd "|git diff-index --cached --ignore-submodules=dirty HEAD"
+        set cmd "|git diff-index --cached --ignore-submodules=dirty HEAD"
     } else {
-	set cmd "|git diff-index --cached HEAD"
+        set cmd "|git diff-index --cached HEAD"
     }
     if {$vfilelimit($curview) ne {}} {
-	set cmd [concat $cmd -- $vfilelimit($curview)]
+        set cmd [concat $cmd -- $vfilelimit($curview)]
     }
     set fd [open $cmd r]
     fconfigure $fd -blocking 0
@@ -5323,22 +5341,22 @@
 
     set isdiff 1
     if {[gets $fd line] < 0} {
-	if {![eof $fd]} {
-	    return 1
-	}
-	set isdiff 0
+        if {![eof $fd]} {
+            return 1
+        }
+        set isdiff 0
     }
     # we only need to see one line and we don't really care what it says...
     stop_instance $inst
 
     if {$serial != $lserial} {
-	return 0
+        return 0
     }
 
     # now see if there are any local changes not checked in to the index
     set cmd "|git diff-files"
     if {$vfilelimit($curview) ne {}} {
-	set cmd [concat $cmd -- $vfilelimit($curview)]
+        set cmd [concat $cmd -- $vfilelimit($curview)]
     }
     set fd [open $cmd r]
     fconfigure $fd -blocking 0
@@ -5346,19 +5364,19 @@
     filerun $fd [list readdifffiles $fd $serial $i]
 
     if {$isdiff && ![commitinview $nullid2 $curview]} {
-	# add the line for the changes in the index to the graph
-	set hl [mc "Local changes checked in to index but not committed"]
-	set commitinfo($nullid2) [list  $hl {} {} {} {} "    $hl\n"]
-	set commitdata($nullid2) "\n    $hl\n"
-	if {[commitinview $nullid $curview]} {
-	    removefakerow $nullid
-	}
-	insertfakerow $nullid2 $viewmainheadid($curview)
+        # add the line for the changes in the index to the graph
+        set hl [mc "Local changes checked in to index but not committed"]
+        set commitinfo($nullid2) [list  $hl {} {} {} {} "    $hl\n"]
+        set commitdata($nullid2) "\n    $hl\n"
+        if {[commitinview $nullid $curview]} {
+            removefakerow $nullid
+        }
+        insertfakerow $nullid2 $viewmainheadid($curview)
     } elseif {!$isdiff && [commitinview $nullid2 $curview]} {
-	if {[commitinview $nullid $curview]} {
-	    removefakerow $nullid
-	}
-	removefakerow $nullid2
+        if {[commitinview $nullid $curview]} {
+            removefakerow $nullid
+        }
+        removefakerow $nullid2
     }
     return 0
 }
@@ -5369,31 +5387,31 @@
 
     set isdiff 1
     if {[gets $fd line] < 0} {
-	if {![eof $fd]} {
-	    return 1
-	}
-	set isdiff 0
+        if {![eof $fd]} {
+            return 1
+        }
+        set isdiff 0
     }
     # we only need to see one line and we don't really care what it says...
     stop_instance $inst
 
     if {$serial != $lserial} {
-	return 0
+        return 0
     }
 
     if {$isdiff && ![commitinview $nullid $curview]} {
-	# add the line for the local diff to the graph
-	set hl [mc "Local uncommitted changes, not checked in to index"]
-	set commitinfo($nullid) [list  $hl {} {} {} {} "    $hl\n"]
-	set commitdata($nullid) "\n    $hl\n"
-	if {[commitinview $nullid2 $curview]} {
-	    set p $nullid2
-	} else {
-	    set p $viewmainheadid($curview)
-	}
-	insertfakerow $nullid $p
+        # add the line for the local diff to the graph
+        set hl [mc "Local uncommitted changes, not checked in to index"]
+        set commitinfo($nullid) [list  $hl {} {} {} {} "    $hl\n"]
+        set commitdata($nullid) "\n    $hl\n"
+        if {[commitinview $nullid2 $curview]} {
+            set p $nullid2
+        } else {
+            set p $viewmainheadid($curview)
+        }
+        insertfakerow $nullid $p
     } elseif {!$isdiff && [commitinview $nullid $curview]} {
-	removefakerow $nullid
+        removefakerow $nullid
     }
     return 0
 }
@@ -5402,17 +5420,17 @@
     global curview children
 
     if {[info exists children($curview,$id)]} {
-	foreach kid $children($curview,$id) {
-	    if {![commitinview $kid $curview]} {
-		return -1
-	    }
-	    if {[rowofcommit $kid] > $row} {
-		return [rowofcommit $kid]
-	    }
-	}
+        foreach kid $children($curview,$id) {
+            if {![commitinview $kid $curview]} {
+                return -1
+            }
+            if {[rowofcommit $kid] > $row} {
+                return [rowofcommit $kid]
+            }
+        }
     }
     if {[commitinview $id $curview]} {
-	return [rowofcommit $id]
+        return [rowofcommit $id]
     }
     return -1
 }
@@ -5422,12 +5440,12 @@
 
     set ret -1
     if {[info exists children($curview,$id)]} {
-	foreach kid $children($curview,$id) {
-	    if {![commitinview $kid $curview]} break
-	    if {[rowofcommit $kid] < $row} {
-		set ret [rowofcommit $kid]
-	    }
-	}
+        foreach kid $children($curview,$id) {
+            if {![commitinview $kid $curview]} break
+            if {[rowofcommit $kid] < $row} {
+                set ret [rowofcommit $kid]
+            }
+        }
     }
     return $ret
 }
@@ -5438,70 +5456,70 @@
 
     set r [expr {$row - $mingaplen - $downarrowlen - 1}]
     if {$r < 0} {
-	set r 0
+        set r 0
     }
     set ra [expr {$row - $downarrowlen}]
     if {$ra < 0} {
-	set ra 0
+        set ra 0
     }
     set rb [expr {$row + $uparrowlen}]
     if {$rb > $commitidx($curview)} {
-	set rb $commitidx($curview)
+        set rb $commitidx($curview)
     }
     make_disporder $r [expr {$rb + 1}]
     set ids {}
     for {} {$r < $ra} {incr r} {
-	set nextid [lindex $displayorder [expr {$r + 1}]]
-	foreach p [lindex $parentlist $r] {
-	    if {$p eq $nextid} continue
-	    set rn [nextuse $p $r]
-	    if {$rn >= $row &&
-		$rn <= $r + $downarrowlen + $mingaplen + $uparrowlen} {
-		lappend ids [list [ordertoken $p] $p]
-	    }
-	}
+        set nextid [lindex $displayorder [expr {$r + 1}]]
+        foreach p [lindex $parentlist $r] {
+            if {$p eq $nextid} continue
+            set rn [nextuse $p $r]
+            if {$rn >= $row &&
+                $rn <= $r + $downarrowlen + $mingaplen + $uparrowlen} {
+                lappend ids [list [ordertoken $p] $p]
+            }
+        }
     }
     for {} {$r < $row} {incr r} {
-	set nextid [lindex $displayorder [expr {$r + 1}]]
-	foreach p [lindex $parentlist $r] {
-	    if {$p eq $nextid} continue
-	    set rn [nextuse $p $r]
-	    if {$rn < 0 || $rn >= $row} {
-		lappend ids [list [ordertoken $p] $p]
-	    }
-	}
+        set nextid [lindex $displayorder [expr {$r + 1}]]
+        foreach p [lindex $parentlist $r] {
+            if {$p eq $nextid} continue
+            set rn [nextuse $p $r]
+            if {$rn < 0 || $rn >= $row} {
+                lappend ids [list [ordertoken $p] $p]
+            }
+        }
     }
     set id [lindex $displayorder $row]
     lappend ids [list [ordertoken $id] $id]
     while {$r < $rb} {
-	foreach p [lindex $parentlist $r] {
-	    set firstkid [lindex $children($curview,$p) 0]
-	    if {[rowofcommit $firstkid] < $row} {
-		lappend ids [list [ordertoken $p] $p]
-	    }
-	}
-	incr r
-	set id [lindex $displayorder $r]
-	if {$id ne {}} {
-	    set firstkid [lindex $children($curview,$id) 0]
-	    if {$firstkid ne {} && [rowofcommit $firstkid] < $row} {
-		lappend ids [list [ordertoken $id] $id]
-	    }
-	}
+        foreach p [lindex $parentlist $r] {
+            set firstkid [lindex $children($curview,$p) 0]
+            if {[rowofcommit $firstkid] < $row} {
+                lappend ids [list [ordertoken $p] $p]
+            }
+        }
+        incr r
+        set id [lindex $displayorder $r]
+        if {$id ne {}} {
+            set firstkid [lindex $children($curview,$id) 0]
+            if {$firstkid ne {} && [rowofcommit $firstkid] < $row} {
+                lappend ids [list [ordertoken $id] $id]
+            }
+        }
     }
     set idlist {}
     foreach idx [lsort -unique $ids] {
-	lappend idlist [lindex $idx 1]
+        lappend idlist [lindex $idx 1]
     }
     return $idlist
 }
 
 proc rowsequal {a b} {
     while {[set i [lsearch -exact $a {}]] >= 0} {
-	set a [lreplace $a $i $i]
+        set a [lreplace $a $i $i]
     }
     while {[set i [lsearch -exact $b {}]] >= 0} {
-	set b [lreplace $b $i $i]
+        set b [lreplace $b $i $i]
     }
     return [expr {$a eq $b}]
 }
@@ -5510,20 +5528,20 @@
     global rowidlist uparrowlen downarrowlen mingaplen
 
     for {set r $rend} {1} {set r $rstart} {
-	set rstart [prevuse $id $r]
-	if {$rstart < 0} return
-	if {$rstart < $row} break
+        set rstart [prevuse $id $r]
+        if {$rstart < 0} return
+        if {$rstart < $row} break
     }
     if {$rstart + $uparrowlen + $mingaplen + $downarrowlen < $rend} {
-	set rstart [expr {$rend - $uparrowlen - 1}]
+        set rstart [expr {$rend - $uparrowlen - 1}]
     }
     for {set r $rstart} {[incr r] <= $row} {} {
-	set idlist [lindex $rowidlist $r]
-	if {$idlist ne {} && [lsearch -exact $idlist $id] < 0} {
-	    set col [idcol $idlist $id $col]
-	    lset rowidlist $r [linsert $idlist $col $id]
-	    changedrow $r
-	}
+        set idlist [lindex $rowidlist $r]
+        if {$idlist ne {} && [lsearch -exact $idlist $id] < 0} {
+            set col [idcol $idlist $id $col]
+            lset rowidlist $r [linsert $idlist $col $id]
+            changedrow $r
+        }
     }
 }
 
@@ -5536,100 +5554,100 @@
     make_disporder [expr {$row - 1}] [expr {$endrow + $uparrowlen}]
     set idlist {}
     if {$row > 0} {
-	set rm1 [expr {$row - 1}]
-	foreach id [lindex $rowidlist $rm1] {
-	    if {$id ne {}} {
-		lappend idlist $id
-	    }
-	}
-	set final [lindex $rowfinal $rm1]
+        set rm1 [expr {$row - 1}]
+        foreach id [lindex $rowidlist $rm1] {
+            if {$id ne {}} {
+                lappend idlist $id
+            }
+        }
+        set final [lindex $rowfinal $rm1]
     }
     for {} {$row < $endrow} {incr row} {
-	set rm1 [expr {$row - 1}]
-	if {$rm1 < 0 || $idlist eq {}} {
-	    set idlist [make_idlist $row]
-	    set final 1
-	} else {
-	    set id [lindex $displayorder $rm1]
-	    set col [lsearch -exact $idlist $id]
-	    set idlist [lreplace $idlist $col $col]
-	    foreach p [lindex $parentlist $rm1] {
-		if {[lsearch -exact $idlist $p] < 0} {
-		    set col [idcol $idlist $p $col]
-		    set idlist [linsert $idlist $col $p]
-		    # if not the first child, we have to insert a line going up
-		    if {$id ne [lindex $children($curview,$p) 0]} {
-			makeupline $p $rm1 $row $col
-		    }
-		}
-	    }
-	    set id [lindex $displayorder $row]
-	    if {$row > $downarrowlen} {
-		set termrow [expr {$row - $downarrowlen - 1}]
-		foreach p [lindex $parentlist $termrow] {
-		    set i [lsearch -exact $idlist $p]
-		    if {$i < 0} continue
-		    set nr [nextuse $p $termrow]
-		    if {$nr < 0 || $nr >= $row + $mingaplen + $uparrowlen} {
-			set idlist [lreplace $idlist $i $i]
-		    }
-		}
-	    }
-	    set col [lsearch -exact $idlist $id]
-	    if {$col < 0} {
-		set col [idcol $idlist $id]
-		set idlist [linsert $idlist $col $id]
-		if {$children($curview,$id) ne {}} {
-		    makeupline $id $rm1 $row $col
-		}
-	    }
-	    set r [expr {$row + $uparrowlen - 1}]
-	    if {$r < $commitidx($curview)} {
-		set x $col
-		foreach p [lindex $parentlist $r] {
-		    if {[lsearch -exact $idlist $p] >= 0} continue
-		    set fk [lindex $children($curview,$p) 0]
-		    if {[rowofcommit $fk] < $row} {
-			set x [idcol $idlist $p $x]
-			set idlist [linsert $idlist $x $p]
-		    }
-		}
-		if {[incr r] < $commitidx($curview)} {
-		    set p [lindex $displayorder $r]
-		    if {[lsearch -exact $idlist $p] < 0} {
-			set fk [lindex $children($curview,$p) 0]
-			if {$fk ne {} && [rowofcommit $fk] < $row} {
-			    set x [idcol $idlist $p $x]
-			    set idlist [linsert $idlist $x $p]
-			}
-		    }
-		}
-	    }
-	}
-	if {$final && !$viewcomplete($curview) &&
-	    $row + $uparrowlen + $mingaplen + $downarrowlen
-		>= $commitidx($curview)} {
-	    set final 0
-	}
-	set l [llength $rowidlist]
-	if {$row == $l} {
-	    lappend rowidlist $idlist
-	    lappend rowisopt 0
-	    lappend rowfinal $final
-	} elseif {$row < $l} {
-	    if {![rowsequal $idlist [lindex $rowidlist $row]]} {
-		lset rowidlist $row $idlist
-		changedrow $row
-	    }
-	    lset rowfinal $row $final
-	} else {
-	    set pad [ntimes [expr {$row - $l}] {}]
-	    set rowidlist [concat $rowidlist $pad]
-	    lappend rowidlist $idlist
-	    set rowfinal [concat $rowfinal $pad]
-	    lappend rowfinal $final
-	    set rowisopt [concat $rowisopt [ntimes [expr {$row - $l + 1}] 0]]
-	}
+        set rm1 [expr {$row - 1}]
+        if {$rm1 < 0 || $idlist eq {}} {
+            set idlist [make_idlist $row]
+            set final 1
+        } else {
+            set id [lindex $displayorder $rm1]
+            set col [lsearch -exact $idlist $id]
+            set idlist [lreplace $idlist $col $col]
+            foreach p [lindex $parentlist $rm1] {
+                if {[lsearch -exact $idlist $p] < 0} {
+                    set col [idcol $idlist $p $col]
+                    set idlist [linsert $idlist $col $p]
+                    # if not the first child, we have to insert a line going up
+                    if {$id ne [lindex $children($curview,$p) 0]} {
+                        makeupline $p $rm1 $row $col
+                    }
+                }
+            }
+            set id [lindex $displayorder $row]
+            if {$row > $downarrowlen} {
+                set termrow [expr {$row - $downarrowlen - 1}]
+                foreach p [lindex $parentlist $termrow] {
+                    set i [lsearch -exact $idlist $p]
+                    if {$i < 0} continue
+                    set nr [nextuse $p $termrow]
+                    if {$nr < 0 || $nr >= $row + $mingaplen + $uparrowlen} {
+                        set idlist [lreplace $idlist $i $i]
+                    }
+                }
+            }
+            set col [lsearch -exact $idlist $id]
+            if {$col < 0} {
+                set col [idcol $idlist $id]
+                set idlist [linsert $idlist $col $id]
+                if {$children($curview,$id) ne {}} {
+                    makeupline $id $rm1 $row $col
+                }
+            }
+            set r [expr {$row + $uparrowlen - 1}]
+            if {$r < $commitidx($curview)} {
+                set x $col
+                foreach p [lindex $parentlist $r] {
+                    if {[lsearch -exact $idlist $p] >= 0} continue
+                    set fk [lindex $children($curview,$p) 0]
+                    if {[rowofcommit $fk] < $row} {
+                        set x [idcol $idlist $p $x]
+                        set idlist [linsert $idlist $x $p]
+                    }
+                }
+                if {[incr r] < $commitidx($curview)} {
+                    set p [lindex $displayorder $r]
+                    if {[lsearch -exact $idlist $p] < 0} {
+                        set fk [lindex $children($curview,$p) 0]
+                        if {$fk ne {} && [rowofcommit $fk] < $row} {
+                            set x [idcol $idlist $p $x]
+                            set idlist [linsert $idlist $x $p]
+                        }
+                    }
+                }
+            }
+        }
+        if {$final && !$viewcomplete($curview) &&
+            $row + $uparrowlen + $mingaplen + $downarrowlen
+                >= $commitidx($curview)} {
+            set final 0
+        }
+        set l [llength $rowidlist]
+        if {$row == $l} {
+            lappend rowidlist $idlist
+            lappend rowisopt 0
+            lappend rowfinal $final
+        } elseif {$row < $l} {
+            if {![rowsequal $idlist [lindex $rowidlist $row]]} {
+                lset rowidlist $row $idlist
+                changedrow $row
+            }
+            lset rowfinal $row $final
+        } else {
+            set pad [ntimes [expr {$row - $l}] {}]
+            set rowidlist [concat $rowidlist $pad]
+            lappend rowidlist $idlist
+            set rowfinal [concat $rowfinal $pad]
+            lappend rowfinal $final
+            set rowisopt [concat $rowisopt [ntimes [expr {$row - $l + 1}] 0]]
+        }
     }
     return $row
 }
@@ -5639,17 +5657,17 @@
 
     set l [llength $rowisopt]
     if {$row < $l} {
-	lset rowisopt $row 0
-	if {$row + 1 < $l} {
-	    lset rowisopt [expr {$row + 1}] 0
-	    if {$row + 2 < $l} {
-		lset rowisopt [expr {$row + 2}] 0
-	    }
-	}
+        lset rowisopt $row 0
+        if {$row + 1 < $l} {
+            lset rowisopt [expr {$row + 1}] 0
+            if {$row + 2 < $l} {
+                lset rowisopt [expr {$row + 2}] 0
+            }
+        }
     }
     set id [lindex $displayorder $row]
     if {[info exists iddrawn($id)]} {
-	set need_redisplay 1
+        set need_redisplay 1
     }
 }
 
@@ -5662,7 +5680,7 @@
     set aft [lrange $idlist $col end]
     set i [lsearch -exact $aft {}]
     if {$i > 0} {
-	set aft [lreplace $aft $i $i]
+        set aft [lreplace $aft $i $i]
     }
     lset rowidlist $row [concat $bef $pad $aft]
     changedrow $row
@@ -5672,123 +5690,123 @@
     global rowidlist rowisopt displayorder curview children
 
     if {$row < 1} {
-	set row 1
+        set row 1
     }
     for {} {$row < $endrow} {incr row; set col 0} {
-	if {[lindex $rowisopt $row]} continue
-	set haspad 0
-	set y0 [expr {$row - 1}]
-	set ym [expr {$row - 2}]
-	set idlist [lindex $rowidlist $row]
-	set previdlist [lindex $rowidlist $y0]
-	if {$idlist eq {} || $previdlist eq {}} continue
-	if {$ym >= 0} {
-	    set pprevidlist [lindex $rowidlist $ym]
-	    if {$pprevidlist eq {}} continue
-	} else {
-	    set pprevidlist {}
-	}
-	set x0 -1
-	set xm -1
-	for {} {$col < [llength $idlist]} {incr col} {
-	    set id [lindex $idlist $col]
-	    if {[lindex $previdlist $col] eq $id} continue
-	    if {$id eq {}} {
-		set haspad 1
-		continue
-	    }
-	    set x0 [lsearch -exact $previdlist $id]
-	    if {$x0 < 0} continue
-	    set z [expr {$x0 - $col}]
-	    set isarrow 0
-	    set z0 {}
-	    if {$ym >= 0} {
-		set xm [lsearch -exact $pprevidlist $id]
-		if {$xm >= 0} {
-		    set z0 [expr {$xm - $x0}]
-		}
-	    }
-	    if {$z0 eq {}} {
-		# if row y0 is the first child of $id then it's not an arrow
-		if {[lindex $children($curview,$id) 0] ne
-		    [lindex $displayorder $y0]} {
-		    set isarrow 1
-		}
-	    }
-	    if {!$isarrow && $id ne [lindex $displayorder $row] &&
-		[lsearch -exact [lindex $rowidlist [expr {$row+1}]] $id] < 0} {
-		set isarrow 1
-	    }
-	    # Looking at lines from this row to the previous row,
-	    # make them go straight up if they end in an arrow on
-	    # the previous row; otherwise make them go straight up
-	    # or at 45 degrees.
-	    if {$z < -1 || ($z < 0 && $isarrow)} {
-		# Line currently goes left too much;
-		# insert pads in the previous row, then optimize it
-		set npad [expr {-1 - $z + $isarrow}]
-		insert_pad $y0 $x0 $npad
-		if {$y0 > 0} {
-		    optimize_rows $y0 $x0 $row
-		}
-		set previdlist [lindex $rowidlist $y0]
-		set x0 [lsearch -exact $previdlist $id]
-		set z [expr {$x0 - $col}]
-		if {$z0 ne {}} {
-		    set pprevidlist [lindex $rowidlist $ym]
-		    set xm [lsearch -exact $pprevidlist $id]
-		    set z0 [expr {$xm - $x0}]
-		}
-	    } elseif {$z > 1 || ($z > 0 && $isarrow)} {
-		# Line currently goes right too much;
-		# insert pads in this line
-		set npad [expr {$z - 1 + $isarrow}]
-		insert_pad $row $col $npad
-		set idlist [lindex $rowidlist $row]
-		incr col $npad
-		set z [expr {$x0 - $col}]
-		set haspad 1
-	    }
-	    if {$z0 eq {} && !$isarrow && $ym >= 0} {
-		# this line links to its first child on row $row-2
-		set id [lindex $displayorder $ym]
-		set xc [lsearch -exact $pprevidlist $id]
-		if {$xc >= 0} {
-		    set z0 [expr {$xc - $x0}]
-		}
-	    }
-	    # avoid lines jigging left then immediately right
-	    if {$z0 ne {} && $z < 0 && $z0 > 0} {
-		insert_pad $y0 $x0 1
-		incr x0
-		optimize_rows $y0 $x0 $row
-		set previdlist [lindex $rowidlist $y0]
-	    }
-	}
-	if {!$haspad} {
-	    # Find the first column that doesn't have a line going right
-	    for {set col [llength $idlist]} {[incr col -1] >= 0} {} {
-		set id [lindex $idlist $col]
-		if {$id eq {}} break
-		set x0 [lsearch -exact $previdlist $id]
-		if {$x0 < 0} {
-		    # check if this is the link to the first child
-		    set kid [lindex $displayorder $y0]
-		    if {[lindex $children($curview,$id) 0] eq $kid} {
-			# it is, work out offset to child
-			set x0 [lsearch -exact $previdlist $kid]
-		    }
-		}
-		if {$x0 <= $col} break
-	    }
-	    # Insert a pad at that column as long as it has a line and
-	    # isn't the last column
-	    if {$x0 >= 0 && [incr col] < [llength $idlist]} {
-		set idlist [linsert $idlist $col {}]
-		lset rowidlist $row $idlist
-		changedrow $row
-	    }
-	}
+        if {[lindex $rowisopt $row]} continue
+        set haspad 0
+        set y0 [expr {$row - 1}]
+        set ym [expr {$row - 2}]
+        set idlist [lindex $rowidlist $row]
+        set previdlist [lindex $rowidlist $y0]
+        if {$idlist eq {} || $previdlist eq {}} continue
+        if {$ym >= 0} {
+            set pprevidlist [lindex $rowidlist $ym]
+            if {$pprevidlist eq {}} continue
+        } else {
+            set pprevidlist {}
+        }
+        set x0 -1
+        set xm -1
+        for {} {$col < [llength $idlist]} {incr col} {
+            set id [lindex $idlist $col]
+            if {[lindex $previdlist $col] eq $id} continue
+            if {$id eq {}} {
+                set haspad 1
+                continue
+            }
+            set x0 [lsearch -exact $previdlist $id]
+            if {$x0 < 0} continue
+            set z [expr {$x0 - $col}]
+            set isarrow 0
+            set z0 {}
+            if {$ym >= 0} {
+                set xm [lsearch -exact $pprevidlist $id]
+                if {$xm >= 0} {
+                    set z0 [expr {$xm - $x0}]
+                }
+            }
+            if {$z0 eq {}} {
+                # if row y0 is the first child of $id then it's not an arrow
+                if {[lindex $children($curview,$id) 0] ne
+                    [lindex $displayorder $y0]} {
+                    set isarrow 1
+                }
+            }
+            if {!$isarrow && $id ne [lindex $displayorder $row] &&
+                [lsearch -exact [lindex $rowidlist [expr {$row+1}]] $id] < 0} {
+                set isarrow 1
+            }
+            # Looking at lines from this row to the previous row,
+            # make them go straight up if they end in an arrow on
+            # the previous row; otherwise make them go straight up
+            # or at 45 degrees.
+            if {$z < -1 || ($z < 0 && $isarrow)} {
+                # Line currently goes left too much;
+                # insert pads in the previous row, then optimize it
+                set npad [expr {-1 - $z + $isarrow}]
+                insert_pad $y0 $x0 $npad
+                if {$y0 > 0} {
+                    optimize_rows $y0 $x0 $row
+                }
+                set previdlist [lindex $rowidlist $y0]
+                set x0 [lsearch -exact $previdlist $id]
+                set z [expr {$x0 - $col}]
+                if {$z0 ne {}} {
+                    set pprevidlist [lindex $rowidlist $ym]
+                    set xm [lsearch -exact $pprevidlist $id]
+                    set z0 [expr {$xm - $x0}]
+                }
+            } elseif {$z > 1 || ($z > 0 && $isarrow)} {
+                # Line currently goes right too much;
+                # insert pads in this line
+                set npad [expr {$z - 1 + $isarrow}]
+                insert_pad $row $col $npad
+                set idlist [lindex $rowidlist $row]
+                incr col $npad
+                set z [expr {$x0 - $col}]
+                set haspad 1
+            }
+            if {$z0 eq {} && !$isarrow && $ym >= 0} {
+                # this line links to its first child on row $row-2
+                set id [lindex $displayorder $ym]
+                set xc [lsearch -exact $pprevidlist $id]
+                if {$xc >= 0} {
+                    set z0 [expr {$xc - $x0}]
+                }
+            }
+            # avoid lines jigging left then immediately right
+            if {$z0 ne {} && $z < 0 && $z0 > 0} {
+                insert_pad $y0 $x0 1
+                incr x0
+                optimize_rows $y0 $x0 $row
+                set previdlist [lindex $rowidlist $y0]
+            }
+        }
+        if {!$haspad} {
+            # Find the first column that doesn't have a line going right
+            for {set col [llength $idlist]} {[incr col -1] >= 0} {} {
+                set id [lindex $idlist $col]
+                if {$id eq {}} break
+                set x0 [lsearch -exact $previdlist $id]
+                if {$x0 < 0} {
+                    # check if this is the link to the first child
+                    set kid [lindex $displayorder $y0]
+                    if {[lindex $children($curview,$id) 0] eq $kid} {
+                        # it is, work out offset to child
+                        set x0 [lsearch -exact $previdlist $kid]
+                    }
+                }
+                if {$x0 <= $col} break
+            }
+            # Insert a pad at that column as long as it has a line and
+            # isn't the last column
+            if {$x0 >= 0 && [incr col] < [llength $idlist]} {
+                set idlist [linsert $idlist $col {}]
+                lset rowidlist $row $idlist
+                changedrow $row
+            }
+        }
     }
 }
 
@@ -5807,7 +5825,7 @@
 
     set wid $lthickness
     if {[info exists thickerline] && $id eq $thickerline} {
-	set wid [expr {2 * $lthickness}]
+        set wid [expr {2 * $lthickness}]
     }
     return $wid
 }
@@ -5818,52 +5836,52 @@
 
     set kids $children($curview,$id)
     if {$kids eq {}} {
-	return {}
+        return {}
     }
     set ret {}
     lappend kids $id
     foreach child $kids {
-	if {![commitinview $child $curview]} break
-	set row [rowofcommit $child]
-	if {![info exists prev]} {
-	    lappend ret [expr {$row + 1}]
-	} else {
-	    if {$row <= $prevrow} {
-		puts "oops children of [shortids $id] out of order [shortids $child] $row <= [shortids $prev] $prevrow"
-	    }
-	    # see if the line extends the whole way from prevrow to row
-	    if {$row > $prevrow + $uparrowlen + $downarrowlen &&
-		[lsearch -exact [lindex $rowidlist \
-			    [expr {int(($row + $prevrow) / 2)}]] $id] < 0} {
-		# it doesn't, see where it ends
-		set r [expr {$prevrow + $downarrowlen}]
-		if {[lsearch -exact [lindex $rowidlist $r] $id] < 0} {
-		    while {[incr r -1] > $prevrow &&
-			   [lsearch -exact [lindex $rowidlist $r] $id] < 0} {}
-		} else {
-		    while {[incr r] <= $row &&
-			   [lsearch -exact [lindex $rowidlist $r] $id] >= 0} {}
-		    incr r -1
-		}
-		lappend ret $r
-		# see where it starts up again
-		set r [expr {$row - $uparrowlen}]
-		if {[lsearch -exact [lindex $rowidlist $r] $id] < 0} {
-		    while {[incr r] < $row &&
-			   [lsearch -exact [lindex $rowidlist $r] $id] < 0} {}
-		} else {
-		    while {[incr r -1] >= $prevrow &&
-			   [lsearch -exact [lindex $rowidlist $r] $id] >= 0} {}
-		    incr r
-		}
-		lappend ret $r
-	    }
-	}
-	if {$child eq $id} {
-	    lappend ret $row
-	}
-	set prev $child
-	set prevrow $row
+        if {![commitinview $child $curview]} break
+        set row [rowofcommit $child]
+        if {![info exists prev]} {
+            lappend ret [expr {$row + 1}]
+        } else {
+            if {$row <= $prevrow} {
+                puts "oops children of [shortids $id] out of order [shortids $child] $row <= [shortids $prev] $prevrow"
+            }
+            # see if the line extends the whole way from prevrow to row
+            if {$row > $prevrow + $uparrowlen + $downarrowlen &&
+                [lsearch -exact [lindex $rowidlist \
+                            [expr {int(($row + $prevrow) / 2)}]] $id] < 0} {
+                # it doesn't, see where it ends
+                set r [expr {$prevrow + $downarrowlen}]
+                if {[lsearch -exact [lindex $rowidlist $r] $id] < 0} {
+                    while {[incr r -1] > $prevrow &&
+                           [lsearch -exact [lindex $rowidlist $r] $id] < 0} {}
+                } else {
+                    while {[incr r] <= $row &&
+                           [lsearch -exact [lindex $rowidlist $r] $id] >= 0} {}
+                    incr r -1
+                }
+                lappend ret $r
+                # see where it starts up again
+                set r [expr {$row - $uparrowlen}]
+                if {[lsearch -exact [lindex $rowidlist $r] $id] < 0} {
+                    while {[incr r] < $row &&
+                           [lsearch -exact [lindex $rowidlist $r] $id] < 0} {}
+                } else {
+                    while {[incr r -1] >= $prevrow &&
+                           [lsearch -exact [lindex $rowidlist $r] $id] >= 0} {}
+                    incr r
+                }
+                lappend ret $r
+            }
+        }
+        if {$child eq $id} {
+            lappend ret $row
+        }
+        set prev $child
+        set prevrow $row
     }
     return $ret
 }
@@ -5876,158 +5894,158 @@
     set le [expr {$row + 1}]
     set arrowhigh 1
     while {1} {
-	set c [lsearch -exact [lindex $rowidlist $le] $id]
-	if {$c < 0} {
-	    incr le -1
-	    break
-	}
-	lappend cols $c
-	set x [lindex $displayorder $le]
-	if {$x eq $id} {
-	    set arrowhigh 0
-	    break
-	}
-	if {[info exists iddrawn($x)] || $le == $endrow} {
-	    set c [lsearch -exact [lindex $rowidlist [expr {$le+1}]] $id]
-	    if {$c >= 0} {
-		lappend cols $c
-		set arrowhigh 0
-	    }
-	    break
-	}
-	incr le
+        set c [lsearch -exact [lindex $rowidlist $le] $id]
+        if {$c < 0} {
+            incr le -1
+            break
+        }
+        lappend cols $c
+        set x [lindex $displayorder $le]
+        if {$x eq $id} {
+            set arrowhigh 0
+            break
+        }
+        if {[info exists iddrawn($x)] || $le == $endrow} {
+            set c [lsearch -exact [lindex $rowidlist [expr {$le+1}]] $id]
+            if {$c >= 0} {
+                lappend cols $c
+                set arrowhigh 0
+            }
+            break
+        }
+        incr le
     }
     if {$le <= $row} {
-	return $row
+        return $row
     }
 
     set lines {}
     set i 0
     set joinhigh 0
     if {[info exists linesegs($id)]} {
-	set lines $linesegs($id)
-	foreach li $lines {
-	    set r0 [lindex $li 0]
-	    if {$r0 > $row} {
-		if {$r0 == $le && [lindex $li 1] - $row <= $maxlinelen} {
-		    set joinhigh 1
-		}
-		break
-	    }
-	    incr i
-	}
+        set lines $linesegs($id)
+        foreach li $lines {
+            set r0 [lindex $li 0]
+            if {$r0 > $row} {
+                if {$r0 == $le && [lindex $li 1] - $row <= $maxlinelen} {
+                    set joinhigh 1
+                }
+                break
+            }
+            incr i
+        }
     }
     set joinlow 0
     if {$i > 0} {
-	set li [lindex $lines [expr {$i-1}]]
-	set r1 [lindex $li 1]
-	if {$r1 == $row && $le - [lindex $li 0] <= $maxlinelen} {
-	    set joinlow 1
-	}
+        set li [lindex $lines [expr {$i-1}]]
+        set r1 [lindex $li 1]
+        if {$r1 == $row && $le - [lindex $li 0] <= $maxlinelen} {
+            set joinlow 1
+        }
     }
 
     set x [lindex $cols [expr {$le - $row}]]
     set xp [lindex $cols [expr {$le - 1 - $row}]]
     set dir [expr {$xp - $x}]
     if {$joinhigh} {
-	set ith [lindex $lines $i 2]
-	set coords [$canv coords $ith]
-	set ah [$canv itemcget $ith -arrow]
-	set arrowhigh [expr {$ah eq "first" || $ah eq "both"}]
-	set x2 [lindex $cols [expr {$le + 1 - $row}]]
-	if {$x2 ne {} && $x - $x2 == $dir} {
-	    set coords [lrange $coords 0 end-2]
-	}
+        set ith [lindex $lines $i 2]
+        set coords [$canv coords $ith]
+        set ah [$canv itemcget $ith -arrow]
+        set arrowhigh [expr {$ah eq "first" || $ah eq "both"}]
+        set x2 [lindex $cols [expr {$le + 1 - $row}]]
+        if {$x2 ne {} && $x - $x2 == $dir} {
+            set coords [lrange $coords 0 end-2]
+        }
     } else {
-	set coords [list [xc $le $x] [yc $le]]
+        set coords [list [xc $le $x] [yc $le]]
     }
     if {$joinlow} {
-	set itl [lindex $lines [expr {$i-1}] 2]
-	set al [$canv itemcget $itl -arrow]
-	set arrowlow [expr {$al eq "last" || $al eq "both"}]
+        set itl [lindex $lines [expr {$i-1}] 2]
+        set al [$canv itemcget $itl -arrow]
+        set arrowlow [expr {$al eq "last" || $al eq "both"}]
     } elseif {$arrowlow} {
-	if {[lsearch -exact [lindex $rowidlist [expr {$row-1}]] $id] >= 0 ||
-	    [lsearch -exact [lindex $parentlist [expr {$row-1}]] $id] >= 0} {
-	    set arrowlow 0
-	}
+        if {[lsearch -exact [lindex $rowidlist [expr {$row-1}]] $id] >= 0 ||
+            [lsearch -exact [lindex $parentlist [expr {$row-1}]] $id] >= 0} {
+            set arrowlow 0
+        }
     }
     set arrow [lindex {none first last both} [expr {$arrowhigh + 2*$arrowlow}]]
     for {set y $le} {[incr y -1] > $row} {} {
-	set x $xp
-	set xp [lindex $cols [expr {$y - 1 - $row}]]
-	set ndir [expr {$xp - $x}]
-	if {$dir != $ndir || $xp < 0} {
-	    lappend coords [xc $y $x] [yc $y]
-	}
-	set dir $ndir
+        set x $xp
+        set xp [lindex $cols [expr {$y - 1 - $row}]]
+        set ndir [expr {$xp - $x}]
+        if {$dir != $ndir || $xp < 0} {
+            lappend coords [xc $y $x] [yc $y]
+        }
+        set dir $ndir
     }
     if {!$joinlow} {
-	if {$xp < 0} {
-	    # join parent line to first child
-	    set ch [lindex $displayorder $row]
-	    set xc [lsearch -exact [lindex $rowidlist $row] $ch]
-	    if {$xc < 0} {
-		puts "oops: drawlineseg: child $ch not on row $row"
-	    } elseif {$xc != $x} {
-		if {($arrowhigh && $le == $row + 1) || $dir == 0} {
-		    set d [expr {int(0.5 * $linespc)}]
-		    set x1 [xc $row $x]
-		    if {$xc < $x} {
-			set x2 [expr {$x1 - $d}]
-		    } else {
-			set x2 [expr {$x1 + $d}]
-		    }
-		    set y2 [yc $row]
-		    set y1 [expr {$y2 + $d}]
-		    lappend coords $x1 $y1 $x2 $y2
-		} elseif {$xc < $x - 1} {
-		    lappend coords [xc $row [expr {$x-1}]] [yc $row]
-		} elseif {$xc > $x + 1} {
-		    lappend coords [xc $row [expr {$x+1}]] [yc $row]
-		}
-		set x $xc
-	    }
-	    lappend coords [xc $row $x] [yc $row]
-	} else {
-	    set xn [xc $row $xp]
-	    set yn [yc $row]
-	    lappend coords $xn $yn
-	}
-	if {!$joinhigh} {
-	    assigncolor $id
-	    set t [$canv create line $coords -width [linewidth $id] \
-		       -fill $colormap($id) -tags lines.$id -arrow $arrow]
-	    $canv lower $t
-	    bindline $t $id
-	    set lines [linsert $lines $i [list $row $le $t]]
-	} else {
-	    $canv coords $ith $coords
-	    if {$arrow ne $ah} {
-		$canv itemconf $ith -arrow $arrow
-	    }
-	    lset lines $i 0 $row
-	}
+        if {$xp < 0} {
+            # join parent line to first child
+            set ch [lindex $displayorder $row]
+            set xc [lsearch -exact [lindex $rowidlist $row] $ch]
+            if {$xc < 0} {
+                puts "oops: drawlineseg: child $ch not on row $row"
+            } elseif {$xc != $x} {
+                if {($arrowhigh && $le == $row + 1) || $dir == 0} {
+                    set d [expr {int(0.5 * $linespc)}]
+                    set x1 [xc $row $x]
+                    if {$xc < $x} {
+                        set x2 [expr {$x1 - $d}]
+                    } else {
+                        set x2 [expr {$x1 + $d}]
+                    }
+                    set y2 [yc $row]
+                    set y1 [expr {$y2 + $d}]
+                    lappend coords $x1 $y1 $x2 $y2
+                } elseif {$xc < $x - 1} {
+                    lappend coords [xc $row [expr {$x-1}]] [yc $row]
+                } elseif {$xc > $x + 1} {
+                    lappend coords [xc $row [expr {$x+1}]] [yc $row]
+                }
+                set x $xc
+            }
+            lappend coords [xc $row $x] [yc $row]
+        } else {
+            set xn [xc $row $xp]
+            set yn [yc $row]
+            lappend coords $xn $yn
+        }
+        if {!$joinhigh} {
+            assigncolor $id
+            set t [$canv create line $coords -width [linewidth $id] \
+                       -fill $colormap($id) -tags lines.$id -arrow $arrow]
+            $canv lower $t
+            bindline $t $id
+            set lines [linsert $lines $i [list $row $le $t]]
+        } else {
+            $canv coords $ith $coords
+            if {$arrow ne $ah} {
+                $canv itemconf $ith -arrow $arrow
+            }
+            lset lines $i 0 $row
+        }
     } else {
-	set xo [lsearch -exact [lindex $rowidlist [expr {$row - 1}]] $id]
-	set ndir [expr {$xo - $xp}]
-	set clow [$canv coords $itl]
-	if {$dir == $ndir} {
-	    set clow [lrange $clow 2 end]
-	}
-	set coords [concat $coords $clow]
-	if {!$joinhigh} {
-	    lset lines [expr {$i-1}] 1 $le
-	} else {
-	    # coalesce two pieces
-	    $canv delete $ith
-	    set b [lindex $lines [expr {$i-1}] 0]
-	    set e [lindex $lines $i 1]
-	    set lines [lreplace $lines [expr {$i-1}] $i [list $b $e $itl]]
-	}
-	$canv coords $itl $coords
-	if {$arrow ne $al} {
-	    $canv itemconf $itl -arrow $arrow
-	}
+        set xo [lsearch -exact [lindex $rowidlist [expr {$row - 1}]] $id]
+        set ndir [expr {$xo - $xp}]
+        set clow [$canv coords $itl]
+        if {$dir == $ndir} {
+            set clow [lrange $clow 2 end]
+        }
+        set coords [concat $coords $clow]
+        if {!$joinhigh} {
+            lset lines [expr {$i-1}] 1 $le
+        } else {
+            # coalesce two pieces
+            $canv delete $ith
+            set b [lindex $lines [expr {$i-1}] 0]
+            set e [lindex $lines $i 1]
+            set lines [lreplace $lines [expr {$i-1}] $i [list $b $e $itl]]
+        }
+        $canv coords $itl $coords
+        if {$arrow ne $al} {
+            $canv itemconf $itl -arrow $arrow
+        }
     }
 
     set linesegs($id) $lines
@@ -6052,54 +6070,54 @@
     # rmx = right-most X coord used
     set rmx 0
     foreach p $olds {
-	set i [lsearch -exact $ids $p]
-	if {$i < 0} {
-	    puts "oops, parent $p of $id not in list"
-	    continue
-	}
-	set x2 [xc $row2 $i]
-	if {$x2 > $rmx} {
-	    set rmx $x2
-	}
-	set j [lsearch -exact $rowids $p]
-	if {$j < 0} {
-	    # drawlineseg will do this one for us
-	    continue
-	}
-	assigncolor $p
-	# should handle duplicated parents here...
-	set coords [list $x $y]
-	if {$i != $col} {
-	    # if attaching to a vertical segment, draw a smaller
-	    # slant for visual distinctness
-	    if {$i == $j} {
-		if {$i < $col} {
-		    lappend coords [expr {$x2 + $d}] $y $x2 $ymid
-		} else {
-		    lappend coords [expr {$x2 - $d}] $y $x2 $ymid
-		}
-	    } elseif {$i < $col && $i < $j} {
-		# segment slants towards us already
-		lappend coords [xc $row $j] $y
-	    } else {
-		if {$i < $col - 1} {
-		    lappend coords [expr {$x2 + $linespc}] $y
-		} elseif {$i > $col + 1} {
-		    lappend coords [expr {$x2 - $linespc}] $y
-		}
-		lappend coords $x2 $y2
-	    }
-	} else {
-	    lappend coords $x2 $y2
-	}
-	set t [$canv create line $coords -width [linewidth $p] \
-		   -fill $colormap($p) -tags lines.$p]
-	$canv lower $t
-	bindline $t $p
+        set i [lsearch -exact $ids $p]
+        if {$i < 0} {
+            puts "oops, parent $p of $id not in list"
+            continue
+        }
+        set x2 [xc $row2 $i]
+        if {$x2 > $rmx} {
+            set rmx $x2
+        }
+        set j [lsearch -exact $rowids $p]
+        if {$j < 0} {
+            # drawlineseg will do this one for us
+            continue
+        }
+        assigncolor $p
+        # should handle duplicated parents here...
+        set coords [list $x $y]
+        if {$i != $col} {
+            # if attaching to a vertical segment, draw a smaller
+            # slant for visual distinctness
+            if {$i == $j} {
+                if {$i < $col} {
+                    lappend coords [expr {$x2 + $d}] $y $x2 $ymid
+                } else {
+                    lappend coords [expr {$x2 - $d}] $y $x2 $ymid
+                }
+            } elseif {$i < $col && $i < $j} {
+                # segment slants towards us already
+                lappend coords [xc $row $j] $y
+            } else {
+                if {$i < $col - 1} {
+                    lappend coords [expr {$x2 + $linespc}] $y
+                } elseif {$i > $col + 1} {
+                    lappend coords [expr {$x2 - $linespc}] $y
+                }
+                lappend coords $x2 $y2
+            }
+        } else {
+            lappend coords $x2 $y2
+        }
+        set t [$canv create line $coords -width [linewidth $p] \
+                   -fill $colormap($p) -tags lines.$p]
+        $canv lower $t
+        bindline $t $p
     }
     if {$rmx > [lindex $idpos($id) 1]} {
-	lset idpos($id) 1 $rmx
-	redrawtags $id
+        lset idpos($id) 1 $rmx
+        redrawtags $id
     }
 }
 
@@ -6122,35 +6140,35 @@
     # listed is 0 for boundary, 1 for normal, 2 for negative, 3 for left, 4 for right
     set listed $cmitlisted($curview,$id)
     if {$id eq $nullid} {
-	set ofill $workingfilescirclecolor
+        set ofill $workingfilescirclecolor
     } elseif {$id eq $nullid2} {
-	set ofill $indexcirclecolor
+        set ofill $indexcirclecolor
     } elseif {$id eq $mainheadid} {
-	set ofill $mainheadcirclecolor
+        set ofill $mainheadcirclecolor
     } else {
-	set ofill [lindex $circlecolors $listed]
+        set ofill [lindex $circlecolors $listed]
     }
     set x [xc $row $col]
     set y [yc $row]
     set orad [expr {$linespc / 3}]
     if {$listed <= 2} {
-	set t [$canv create oval [expr {$x - $orad}] [expr {$y - $orad}] \
-		   [expr {$x + $orad - 1}] [expr {$y + $orad - 1}] \
-		   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
+        set t [$canv create oval [expr {$x - $orad}] [expr {$y - $orad}] \
+                   [expr {$x + $orad - 1}] [expr {$y + $orad - 1}] \
+                   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
     } elseif {$listed == 3} {
-	# triangle pointing left for left-side commits
-	set t [$canv create polygon \
-		   [expr {$x - $orad}] $y \
-		   [expr {$x + $orad - 1}] [expr {$y - $orad}] \
-		   [expr {$x + $orad - 1}] [expr {$y + $orad - 1}] \
-		   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
+        # triangle pointing left for left-side commits
+        set t [$canv create polygon \
+                   [expr {$x - $orad}] $y \
+                   [expr {$x + $orad - 1}] [expr {$y - $orad}] \
+                   [expr {$x + $orad - 1}] [expr {$y + $orad - 1}] \
+                   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
     } else {
-	# triangle pointing right for right-side commits
-	set t [$canv create polygon \
-		   [expr {$x + $orad - 1}] $y \
-		   [expr {$x - $orad}] [expr {$y - $orad}] \
-		   [expr {$x - $orad}] [expr {$y + $orad - 1}] \
-		   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
+        # triangle pointing right for right-side commits
+        set t [$canv create polygon \
+                   [expr {$x + $orad - 1}] $y \
+                   [expr {$x - $orad}] [expr {$y - $orad}] \
+                   [expr {$x - $orad}] [expr {$y + $orad - 1}] \
+                   -fill $ofill -outline $circleoutlinecolor -width 1 -tags circle]
     }
     set circleitem($row) $t
     $canv raise $t
@@ -6158,23 +6176,23 @@
     set rmx [llength [lindex $rowidlist $row]]
     set olds [lindex $parentlist $row]
     if {$olds ne {}} {
-	set nextids [lindex $rowidlist [expr {$row + 1}]]
-	foreach p $olds {
-	    set i [lsearch -exact $nextids $p]
-	    if {$i > $rmx} {
-		set rmx $i
-	    }
-	}
+        set nextids [lindex $rowidlist [expr {$row + 1}]]
+        foreach p $olds {
+            set i [lsearch -exact $nextids $p]
+            if {$i > $rmx} {
+                set rmx $i
+            }
+        }
     }
     set xt [xc $row $rmx]
     set rowtextx($row) $xt
     set idpos($id) [list $x $xt $y]
     if {[info exists idtags($id)] || [info exists idheads($id)]
-	|| [info exists idotherrefs($id)]} {
-	set xt [drawtags $id $x $xt $y]
+        || [info exists idotherrefs($id)]} {
+        set xt [drawtags $id $x $xt $y]
     }
     if {[lindex $commitinfo($id) 6] > 0} {
-	set xt [drawnotesign $xt $y]
+        set xt [drawnotesign $xt $y]
     }
     set headline [lindex $commitinfo($id) 0]
     set name [lindex $commitinfo($id) 1]
@@ -6184,30 +6202,30 @@
     set nfont mainfont
     set isbold [ishighlighted $id]
     if {$isbold > 0} {
-	lappend boldids $id
-	set font mainfontbold
-	if {$isbold > 1} {
-	    lappend boldnameids $id
-	    set nfont mainfontbold
-	}
+        lappend boldids $id
+        set font mainfontbold
+        if {$isbold > 1} {
+            lappend boldnameids $id
+            set nfont mainfontbold
+        }
     }
     set linehtag($id) [$canv create text $xt $y -anchor w -fill $fgcolor \
-			   -text $headline -font $font -tags text]
+                           -text $headline -font $font -tags text]
     $canv bind $linehtag($id) $ctxbut "rowmenu %X %Y $id"
     set linentag($id) [$canv2 create text 3 $y -anchor w -fill $fgcolor \
-			   -text $name -font $nfont -tags text]
+                           -text $name -font $nfont -tags text]
     set linedtag($id) [$canv3 create text 3 $y -anchor w -fill $fgcolor \
-			   -text $date -font mainfont -tags text]
+                           -text $date -font mainfont -tags text]
     if {$selectedline == $row} {
-	make_secsel $id
+        make_secsel $id
     }
     if {[info exists markedid] && $markedid eq $id} {
-	make_idmark $id
+        make_idmark $id
     }
     set xr [expr {$xt + [font measure $font $headline]}]
     if {$xr > $canvxmax} {
-	set canvxmax $xr
-	setcanvscroll
+        set canvxmax $xr
+        setcanvscroll
     }
 }
 
@@ -6223,33 +6241,33 @@
 
     set id [lindex $displayorder $row]
     if {[info exists hlview] && ![info exists vhighlights($id)]} {
-	askvhighlight $row $id
+        askvhighlight $row $id
     }
     if {[info exists filehighlight] && ![info exists fhighlights($id)]} {
-	askfilehighlight $row $id
+        askfilehighlight $row $id
     }
     if {$findpattern ne {} && ![info exists nhighlights($id)]} {
-	askfindhighlight $row $id
+        askfindhighlight $row $id
     }
     if {$highlight_related ne [mc "None"] && ![info exists rhighlights($id)]} {
-	askrelhighlight $row $id
+        askrelhighlight $row $id
     }
     if {![info exists iddrawn($id)]} {
-	set col [lsearch -exact [lindex $rowidlist $row] $id]
-	if {$col < 0} {
-	    puts "oops, row $row id $id not in list"
-	    return
-	}
-	if {![info exists commitinfo($id)]} {
-	    getcommit $id
-	}
-	assigncolor $id
-	drawcmittext $id $row $col
-	set iddrawn($id) 1
-	incr nrows_drawn
+        set col [lsearch -exact [lindex $rowidlist $row] $id]
+        if {$col < 0} {
+            puts "oops, row $row id $id not in list"
+            return
+        }
+        if {![info exists commitinfo($id)]} {
+            getcommit $id
+        }
+        assigncolor $id
+        drawcmittext $id $row $col
+        set iddrawn($id) 1
+        incr nrows_drawn
     }
     if {$markingmatches} {
-	markrowmatches $row $id
+        markrowmatches $row $id
     }
 }
 
@@ -6258,78 +6276,78 @@
     global parentlist rowidlist rowfinal uparrowlen downarrowlen nrows_drawn
 
     if {$row < 0} {
-	set row 0
+        set row 0
     }
     if {$endrow eq {}} {
-	set endrow $row
+        set endrow $row
     }
     if {$endrow >= $numcommits} {
-	set endrow [expr {$numcommits - 1}]
+        set endrow [expr {$numcommits - 1}]
     }
 
     set rl1 [expr {$row - $downarrowlen - 3}]
     if {$rl1 < 0} {
-	set rl1 0
+        set rl1 0
     }
     set ro1 [expr {$row - 3}]
     if {$ro1 < 0} {
-	set ro1 0
+        set ro1 0
     }
     set r2 [expr {$endrow + $uparrowlen + 3}]
     if {$r2 > $numcommits} {
-	set r2 $numcommits
+        set r2 $numcommits
     }
     for {set r $rl1} {$r < $r2} {incr r} {
-	if {[lindex $rowidlist $r] ne {} && [lindex $rowfinal $r]} {
-	    if {$rl1 < $r} {
-		layoutrows $rl1 $r
-	    }
-	    set rl1 [expr {$r + 1}]
-	}
+        if {[lindex $rowidlist $r] ne {} && [lindex $rowfinal $r]} {
+            if {$rl1 < $r} {
+                layoutrows $rl1 $r
+            }
+            set rl1 [expr {$r + 1}]
+        }
     }
     if {$rl1 < $r} {
-	layoutrows $rl1 $r
+        layoutrows $rl1 $r
     }
     optimize_rows $ro1 0 $r2
     if {$need_redisplay || $nrows_drawn > 2000} {
-	clear_display
+        clear_display
     }
 
     # make the lines join to already-drawn rows either side
     set r [expr {$row - 1}]
     if {$r < 0 || ![info exists iddrawn([lindex $displayorder $r])]} {
-	set r $row
+        set r $row
     }
     set er [expr {$endrow + 1}]
     if {$er >= $numcommits ||
-	![info exists iddrawn([lindex $displayorder $er])]} {
-	set er $endrow
+        ![info exists iddrawn([lindex $displayorder $er])]} {
+        set er $endrow
     }
     for {} {$r <= $er} {incr r} {
-	set id [lindex $displayorder $r]
-	set wasdrawn [info exists iddrawn($id)]
-	drawcmitrow $r
-	if {$r == $er} break
-	set nextid [lindex $displayorder [expr {$r + 1}]]
-	if {$wasdrawn && [info exists iddrawn($nextid)]} continue
-	drawparentlinks $id $r
+        set id [lindex $displayorder $r]
+        set wasdrawn [info exists iddrawn($id)]
+        drawcmitrow $r
+        if {$r == $er} break
+        set nextid [lindex $displayorder [expr {$r + 1}]]
+        if {$wasdrawn && [info exists iddrawn($nextid)]} continue
+        drawparentlinks $id $r
 
-	set rowids [lindex $rowidlist $r]
-	foreach lid $rowids {
-	    if {$lid eq {}} continue
-	    if {[info exists lineend($lid)] && $lineend($lid) > $r} continue
-	    if {$lid eq $id} {
-		# see if this is the first child of any of its parents
-		foreach p [lindex $parentlist $r] {
-		    if {[lsearch -exact $rowids $p] < 0} {
-			# make this line extend up to the child
-			set lineend($p) [drawlineseg $p $r $er 0]
-		    }
-		}
-	    } else {
-		set lineend($lid) [drawlineseg $lid $r $er 1]
-	    }
-	}
+        set rowids [lindex $rowidlist $r]
+        foreach lid $rowids {
+            if {$lid eq {}} continue
+            if {[info exists lineend($lid)] && $lineend($lid) > $r} continue
+            if {$lid eq $id} {
+                # see if this is the first child of any of its parents
+                foreach p [lindex $parentlist $r] {
+                    if {[lsearch -exact $rowids $p] < 0} {
+                        # make this line extend up to the child
+                        set lineend($p) [drawlineseg $p $r $er 0]
+                    }
+                }
+            } else {
+                set lineend($lid) [drawlineseg $lid $r $er 1]
+            }
+        }
     }
 }
 
@@ -6339,15 +6357,15 @@
 
     set r [expr {$row - ($uparrowlen + $mingaplen + $downarrowlen)}]
     if {$r < 0} {
-	set r 0
+        set r 0
     }
     if {[llength $rowidlist] > $r} {
-	incr r -1
-	set rowidlist [lrange $rowidlist 0 $r]
-	set rowfinal [lrange $rowfinal 0 $r]
-	set rowisopt [lrange $rowisopt 0 $r]
-	set need_redisplay 1
-	run drawvisible
+        incr r -1
+        set rowidlist [lrange $rowidlist 0 $r]
+        set rowfinal [lrange $rowfinal 0 $r]
+        set rowisopt [lrange $rowisopt 0 $r]
+        set need_redisplay 1
+        run drawvisible
     }
 }
 
@@ -6364,44 +6382,44 @@
     set y1 [expr {int($f1 * $ymax)}]
 
     if {[info exists targetid]} {
-	if {[commitinview $targetid $curview]} {
-	    set r [rowofcommit $targetid]
-	    if {$r != $targetrow} {
-		# Fix up the scrollregion and change the scrolling position
-		# now that our target row has moved.
-		set diff [expr {($r - $targetrow) * $linespc}]
-		set targetrow $r
-		setcanvscroll
-		set ymax [lindex [$canv cget -scrollregion] 3]
-		incr y0 $diff
-		incr y1 $diff
-		set f0 [expr {$y0 / $ymax}]
-		set f1 [expr {$y1 / $ymax}]
-		allcanvs yview moveto $f0
-		$cscroll set $f0 $f1
-		set need_redisplay 1
-	    }
-	} else {
-	    unset targetid
-	}
+        if {[commitinview $targetid $curview]} {
+            set r [rowofcommit $targetid]
+            if {$r != $targetrow} {
+                # Fix up the scrollregion and change the scrolling position
+                # now that our target row has moved.
+                set diff [expr {($r - $targetrow) * $linespc}]
+                set targetrow $r
+                setcanvscroll
+                set ymax [lindex [$canv cget -scrollregion] 3]
+                incr y0 $diff
+                incr y1 $diff
+                set f0 [expr {$y0 / $ymax}]
+                set f1 [expr {$y1 / $ymax}]
+                allcanvs yview moveto $f0
+                $cscroll set $f0 $f1
+                set need_redisplay 1
+            }
+        } else {
+            unset targetid
+        }
     }
 
     set row [expr {int(($y0 - 3) / $linespc) - 1}]
     set endrow [expr {int(($y1 - 3) / $linespc) + 1}]
     if {$endrow >= $vrowmod($curview)} {
-	update_arcrows $curview
+        update_arcrows $curview
     }
     if {$selectedline ne {} &&
-	$row <= $selectedline && $selectedline <= $endrow} {
-	set targetrow $selectedline
+        $row <= $selectedline && $selectedline <= $endrow} {
+        set targetrow $selectedline
     } elseif {[info exists targetid]} {
-	set targetrow [expr {int(($row + $endrow) / 2)}]
+        set targetrow [expr {int(($row + $endrow) / 2)}]
     }
     if {[info exists targetrow]} {
-	if {$targetrow >= $numcommits} {
-	    set targetrow [expr {$numcommits - 1}]
-	}
-	set targetid [commitonrow $targetrow]
+        if {$targetrow >= $numcommits} {
+            set targetrow [expr {$numcommits - 1}]
+        }
+        set targetid [commitonrow $targetrow]
     }
     drawcommits $row $endrow
 }
@@ -6433,31 +6451,31 @@
     set cross {}
     set ccross {}
     foreach {s e} [rowranges $id] {
-	if {$e >= $numcommits} {
-	    set e [expr {$numcommits - 1}]
-	}
-	if {$e <= $s} continue
-	for {set row $e} {[incr row -1] >= $s} {} {
-	    set x [lsearch -exact [lindex $rowidlist $row] $id]
-	    if {$x < 0} break
-	    set olds [lindex $parentlist $row]
-	    set kid [lindex $displayorder $row]
-	    set kidx [lsearch -exact [lindex $rowidlist $row] $kid]
-	    if {$kidx < 0} continue
-	    set nextrow [lindex $rowidlist [expr {$row + 1}]]
-	    foreach p $olds {
-		set px [lsearch -exact $nextrow $p]
-		if {$px < 0} continue
-		if {($kidx < $x && $x < $px) || ($px < $x && $x < $kidx)} {
-		    if {[lsearch -exact $ccross $p] >= 0} continue
-		    if {$x == $px + ($kidx < $px? -1: 1)} {
-			lappend ccross $p
-		    } elseif {[lsearch -exact $cross $p] < 0} {
-			lappend cross $p
-		    }
-		}
-	    }
-	}
+        if {$e >= $numcommits} {
+            set e [expr {$numcommits - 1}]
+        }
+        if {$e <= $s} continue
+        for {set row $e} {[incr row -1] >= $s} {} {
+            set x [lsearch -exact [lindex $rowidlist $row] $id]
+            if {$x < 0} break
+            set olds [lindex $parentlist $row]
+            set kid [lindex $displayorder $row]
+            set kidx [lsearch -exact [lindex $rowidlist $row] $kid]
+            if {$kidx < 0} continue
+            set nextrow [lindex $rowidlist [expr {$row + 1}]]
+            foreach p $olds {
+                set px [lsearch -exact $nextrow $p]
+                if {$px < 0} continue
+                if {($kidx < $x && $x < $px) || ($px < $x && $x < $kidx)} {
+                    if {[lsearch -exact $ccross $p] >= 0} continue
+                    if {$x == $px + ($kidx < $px? -1: 1)} {
+                        lappend ccross $p
+                    } elseif {[lsearch -exact $cross $p] < 0} {
+                        lappend cross $p
+                    }
+                }
+            }
+        }
     }
     return [concat $ccross {{}} $cross]
 }
@@ -6469,58 +6487,58 @@
     if {[info exists colormap($id)]} return
     set ncolors [llength $colors]
     if {[info exists children($curview,$id)]} {
-	set kids $children($curview,$id)
+        set kids $children($curview,$id)
     } else {
-	set kids {}
+        set kids {}
     }
     if {[llength $kids] == 1} {
-	set child [lindex $kids 0]
-	if {[info exists colormap($child)]
-	    && [llength $parents($curview,$child)] == 1} {
-	    set colormap($id) $colormap($child)
-	    return
-	}
+        set child [lindex $kids 0]
+        if {[info exists colormap($child)]
+            && [llength $parents($curview,$child)] == 1} {
+            set colormap($id) $colormap($child)
+            return
+        }
     }
     set badcolors {}
     set origbad {}
     foreach x [findcrossings $id] {
-	if {$x eq {}} {
-	    # delimiter between corner crossings and other crossings
-	    if {[llength $badcolors] >= $ncolors - 1} break
-	    set origbad $badcolors
-	}
-	if {[info exists colormap($x)]
-	    && [lsearch -exact $badcolors $colormap($x)] < 0} {
-	    lappend badcolors $colormap($x)
-	}
+        if {$x eq {}} {
+            # delimiter between corner crossings and other crossings
+            if {[llength $badcolors] >= $ncolors - 1} break
+            set origbad $badcolors
+        }
+        if {[info exists colormap($x)]
+            && [lsearch -exact $badcolors $colormap($x)] < 0} {
+            lappend badcolors $colormap($x)
+        }
     }
     if {[llength $badcolors] >= $ncolors} {
-	set badcolors $origbad
+        set badcolors $origbad
     }
     set origbad $badcolors
     if {[llength $badcolors] < $ncolors - 1} {
-	foreach child $kids {
-	    if {[info exists colormap($child)]
-		&& [lsearch -exact $badcolors $colormap($child)] < 0} {
-		lappend badcolors $colormap($child)
-	    }
-	    foreach p $parents($curview,$child) {
-		if {[info exists colormap($p)]
-		    && [lsearch -exact $badcolors $colormap($p)] < 0} {
-		    lappend badcolors $colormap($p)
-		}
-	    }
-	}
-	if {[llength $badcolors] >= $ncolors} {
-	    set badcolors $origbad
-	}
+        foreach child $kids {
+            if {[info exists colormap($child)]
+                && [lsearch -exact $badcolors $colormap($child)] < 0} {
+                lappend badcolors $colormap($child)
+            }
+            foreach p $parents($curview,$child) {
+                if {[info exists colormap($p)]
+                    && [lsearch -exact $badcolors $colormap($p)] < 0} {
+                    lappend badcolors $colormap($p)
+                }
+            }
+        }
+        if {[llength $badcolors] >= $ncolors} {
+            set badcolors $origbad
+        }
     }
     for {set i 0} {$i <= $ncolors} {incr i} {
-	set c [lindex $colors $nextcolor]
-	if {[incr nextcolor] >= $ncolors} {
-	    set nextcolor 0
-	}
-	if {[lsearch -exact $badcolors $c]} break
+        set c [lindex $colors $nextcolor]
+        if {[incr nextcolor] >= $ncolors} {
+            set nextcolor 0
+        }
+        if {[lsearch -exact $badcolors $c]} break
     }
     set colormap($id) $c
 }
@@ -6538,9 +6556,9 @@
     global use_ttk
 
     if {$use_ttk} {
-	set g [.tf.histframe.pwclist sashpos 0]
+        set g [.tf.histframe.pwclist sashpos 0]
     } else {
-	set g [.tf.histframe.pwclist sash coord 0]
+        set g [.tf.histframe.pwclist sash coord 0]
     }
     return [lindex $g 0]
 }
@@ -6548,7 +6566,7 @@
 proc totalwidth {l font extra} {
     set tot 0
     foreach str $l {
-	set tot [expr {$tot + [font measure $font $str] + $extra}]
+        set tot [expr {$tot + [font measure $font $str] + $extra}]
     }
     return $tot
 }
@@ -6572,29 +6590,29 @@
     set extra [expr {$delta + $lthickness + $linespc}]
 
     if {[info exists idtags($id)]} {
-	set marks $idtags($id)
-	set ntags [llength $marks]
-	if {$ntags > $maxtags ||
-	    [totalwidth $marks mainfont $extra] > $maxwidth} {
-	    # show just a single "n tags..." tag
-	    set singletag 1
-	    if {$ntags == 1} {
-		set marks [list "tag..."]
-	    } else {
-		set marks [list [format "%d tags..." $ntags]]
-	    }
-	    set ntags 1
-	}
+        set marks $idtags($id)
+        set ntags [llength $marks]
+        if {$ntags > $maxtags ||
+            [totalwidth $marks mainfont $extra] > $maxwidth} {
+            # show just a single "n tags..." tag
+            set singletag 1
+            if {$ntags == 1} {
+                set marks [list "tag..."]
+            } else {
+                set marks [list [format "%d tags..." $ntags]]
+            }
+            set ntags 1
+        }
     }
     if {[info exists idheads($id)]} {
-	set marks [concat $marks $idheads($id)]
-	set nheads [llength $idheads($id)]
+        set marks [concat $marks $idheads($id)]
+        set nheads [llength $idheads($id)]
     }
     if {[info exists idotherrefs($id)]} {
-	set marks [concat $marks $idotherrefs($id)]
+        set marks [concat $marks $idotherrefs($id)]
     }
     if {$marks eq {}} {
-	return $xt
+        return $xt
     }
 
     set yt [expr {$y1 - 0.5 * $linespc}]
@@ -6603,66 +6621,66 @@
     set wvals {}
     set i -1
     foreach tag $marks {
-	incr i
-	if {$i >= $ntags && $i < $ntags + $nheads && $tag eq $mainhead} {
-	    set wid [font measure mainfontbold $tag]
-	} else {
-	    set wid [font measure mainfont $tag]
-	}
-	lappend xvals $xt
-	lappend wvals $wid
-	set xt [expr {$xt + $wid + $extra}]
+        incr i
+        if {$i >= $ntags && $i < $ntags + $nheads && $tag eq $mainhead} {
+            set wid [font measure mainfontbold $tag]
+        } else {
+            set wid [font measure mainfont $tag]
+        }
+        lappend xvals $xt
+        lappend wvals $wid
+        set xt [expr {$xt + $wid + $extra}]
     }
     set t [$canv create line $x $y1 [lindex $xvals end] $y1 \
-	       -width $lthickness -fill $reflinecolor -tags tag.$id]
+               -width $lthickness -fill $reflinecolor -tags tag.$id]
     $canv lower $t
     foreach tag $marks x $xvals wid $wvals {
-	set tag_quoted [string map {% %%} $tag]
-	set xl [expr {$x + $delta}]
-	set xr [expr {$x + $delta + $wid + $lthickness}]
-	set font mainfont
-	if {[incr ntags -1] >= 0} {
-	    # draw a tag
-	    set t [$canv create polygon $x [expr {$yt + $delta}] $xl $yt \
-		       $xr $yt $xr $yb $xl $yb $x [expr {$yb - $delta}] \
-		       -width 1 -outline $tagoutlinecolor -fill $tagbgcolor \
-		       -tags tag.$id]
-	    if {$singletag} {
-		set tagclick [list showtags $id 1]
-	    } else {
-		set tagclick [list showtag $tag_quoted 1]
-	    }
-	    $canv bind $t <1> $tagclick
-	    set rowtextx([rowofcommit $id]) [expr {$xr + $linespc}]
-	} else {
-	    # draw a head or other ref
-	    if {[incr nheads -1] >= 0} {
-		set col $headbgcolor
-		if {$tag eq $mainhead} {
-		    set font mainfontbold
-		}
-	    } else {
-		set col "#ddddff"
-	    }
-	    set xl [expr {$xl - $delta/2}]
-	    $canv create polygon $x $yt $xr $yt $xr $yb $x $yb \
-		-width 1 -outline black -fill $col -tags tag.$id
-	    if {[regexp {^(remotes/.*/|remotes/)} $tag match remoteprefix]} {
-	        set rwid [font measure mainfont $remoteprefix]
-		set xi [expr {$x + 1}]
-		set yti [expr {$yt + 1}]
-		set xri [expr {$x + $rwid}]
-		$canv create polygon $xi $yti $xri $yti $xri $yb $xi $yb \
-			-width 0 -fill $remotebgcolor -tags tag.$id
-	    }
-	}
-	set t [$canv create text $xl $y1 -anchor w -text $tag -fill $headfgcolor \
-		   -font $font -tags [list tag.$id text]]
-	if {$ntags >= 0} {
-	    $canv bind $t <1> $tagclick
-	} elseif {$nheads >= 0} {
-	    $canv bind $t $ctxbut [list headmenu %X %Y $id $tag_quoted]
-	}
+        set tag_quoted [string map {% %%} $tag]
+        set xl [expr {$x + $delta}]
+        set xr [expr {$x + $delta + $wid + $lthickness}]
+        set font mainfont
+        if {[incr ntags -1] >= 0} {
+            # draw a tag
+            set t [$canv create polygon $x [expr {$yt + $delta}] $xl $yt \
+                       $xr $yt $xr $yb $xl $yb $x [expr {$yb - $delta}] \
+                       -width 1 -outline $tagoutlinecolor -fill $tagbgcolor \
+                       -tags tag.$id]
+            if {$singletag} {
+                set tagclick [list showtags $id 1]
+            } else {
+                set tagclick [list showtag $tag_quoted 1]
+            }
+            $canv bind $t <1> $tagclick
+            set rowtextx([rowofcommit $id]) [expr {$xr + $linespc}]
+        } else {
+            # draw a head or other ref
+            if {[incr nheads -1] >= 0} {
+                set col $headbgcolor
+                if {$tag eq $mainhead} {
+                    set font mainfontbold
+                }
+            } else {
+                set col "#ddddff"
+            }
+            set xl [expr {$xl - $delta/2}]
+            $canv create polygon $x $yt $xr $yt $xr $yb $x $yb \
+                -width 1 -outline black -fill $col -tags tag.$id
+            if {[regexp {^(remotes/.*/|remotes/)} $tag match remoteprefix]} {
+                set rwid [font measure mainfont $remoteprefix]
+                set xi [expr {$x + 1}]
+                set yti [expr {$yt + 1}]
+                set xri [expr {$x + $rwid}]
+                $canv create polygon $xi $yti $xri $yti $xri $yb $xi $yb \
+                        -width 0 -fill $remotebgcolor -tags tag.$id
+            }
+        }
+        set t [$canv create text $xl $y1 -anchor w -text $tag -fill $headfgcolor \
+                   -font $font -tags [list tag.$id text]]
+        if {$ntags >= 0} {
+            $canv bind $t <1> $tagclick
+        } elseif {$nheads >= 0} {
+            $canv bind $t $ctxbut [list headmenu %X %Y $id $tag_quoted]
+        }
     }
     return $xt
 }
@@ -6672,8 +6690,8 @@
 
     set orad [expr {$linespc / 3}]
     set t [$canv create rectangle [expr {$xt - $orad}] [expr {$y - $orad}] \
-	       [expr {$xt + $orad - 1}] [expr {$y + $orad - 1}] \
-	       -fill yellow -outline $fgcolor -width 1 -tags circle]
+               [expr {$xt + $orad - 1}] [expr {$y + $orad - 1}] \
+               -fill yellow -outline $fgcolor -width 1 -tags circle]
     set xt [expr {$xt + $orad * 3}]
     return $xt
 }
@@ -6683,9 +6701,9 @@
 
     set x [expr {$canvx0 + $i * $xspc1($ln)}]
     if {$i > 0 && $i == $level} {
-	set x [expr {$x + 0.5 * ($xspc2 - $xspc1($ln))}]
+        set x [expr {$x + 0.5 * ($xspc2 - $xspc1($ln))}]
     } elseif {$i > $level} {
-	set x [expr {$x + $xspc2 - $xspc1($ln)}]
+        set x [expr {$x + $xspc2 - $xspc1($ln)}]
     }
     return $x
 }
@@ -6696,7 +6714,7 @@
     clear_display
     set_window_title
     $canv create text 3 3 -anchor nw -text $msg -font mainfont \
-	-tags text -fill $fgcolor
+        -tags text -fill $fgcolor
 }
 
 # Don't change the text pane cursor if it is currently the hand cursor,
@@ -6705,7 +6723,7 @@
     global ctext curtextcursor
 
     if {[$ctext cget -cursor] == $curtextcursor} {
-	$ctext config -cursor $c
+        $ctext config -cursor $c
     }
     set curtextcursor $c
 }
@@ -6714,13 +6732,13 @@
     global isbusy busyname statusw
 
     if {[array names isbusy] eq {}} {
-	. config -cursor watch
-	settextcursor watch
+        . config -cursor watch
+        settextcursor watch
     }
     set isbusy($what) 1
     set busyname($what) $name
     if {$name ne {}} {
-	$statusw conf -text $name
+        $statusw conf -text $name
     }
 }
 
@@ -6728,35 +6746,35 @@
     global isbusy maincursor textcursor busyname statusw
 
     catch {
-	unset isbusy($what)
-	if {$busyname($what) ne {} &&
-	    [$statusw cget -text] eq $busyname($what)} {
-	    $statusw conf -text {}
-	}
+        unset isbusy($what)
+        if {$busyname($what) ne {} &&
+            [$statusw cget -text] eq $busyname($what)} {
+            $statusw conf -text {}
+        }
     }
     if {[array names isbusy] eq {}} {
-	. config -cursor $maincursor
-	settextcursor $textcursor
+        . config -cursor $maincursor
+        settextcursor $textcursor
     }
 }
 
 proc findmatches {f} {
     global findtype findstring
     if {$findtype == [mc "Regexp"]} {
-	set matches [regexp -indices -all -inline $findstring $f]
+        set matches [regexp -indices -all -inline $findstring $f]
     } else {
-	set fs $findstring
-	if {$findtype == [mc "IgnCase"]} {
-	    set f [string tolower $f]
-	    set fs [string tolower $fs]
-	}
-	set matches {}
-	set i 0
-	set l [string length $fs]
-	while {[set j [string first $fs $f $i]] >= 0} {
-	    lappend matches [list $j [expr {$j+$l-1}]]
-	    set i [expr {$j + $l}]
-	}
+        set fs $findstring
+        if {$findtype == [mc "IgnCase"]} {
+            set f [string tolower $f]
+            set fs [string tolower $fs]
+        }
+        set matches {}
+        set i 0
+        set l [string length $fs]
+        while {[set j [string first $fs $f $i]] >= 0} {
+            lappend matches [list $j [expr {$j+$l-1}]]
+            set i [expr {$j + $l}]
+        }
     }
     return $matches
 }
@@ -6766,21 +6784,21 @@
     global gdttype filehighlight fh_serial find_dirn findallowwrap
 
     if {[info exists find_dirn]} {
-	if {$find_dirn == $dirn} return
-	stopfinding
+        if {$find_dirn == $dirn} return
+        stopfinding
     }
     focus .
     if {$findstring eq {} || $numcommits == 0} return
     if {$selectedline eq {}} {
-	set findstartline [lindex [visiblerows] [expr {$dirn < 0}]]
+        set findstartline [lindex [visiblerows] [expr {$dirn < 0}]]
     } else {
-	set findstartline $selectedline
+        set findstartline $selectedline
     }
     set findcurline $findstartline
     nowbusy finding [mc "Searching"]
     if {$gdttype ne [mc "containing:"] && ![info exists filehighlight]} {
-	after cancel do_file_hl $fh_serial
-	do_file_hl $fh_serial
+        after cancel do_file_hl $fh_serial
+        do_file_hl $fh_serial
     }
     set find_dirn $dirn
     set findallowwrap $wrap
@@ -6791,11 +6809,11 @@
     global find_dirn findcurline fprogcoord
 
     if {[info exists find_dirn]} {
-	unset find_dirn
-	unset findcurline
-	notbusy finding
-	set fprogcoord 0
-	adjustprogress
+        unset find_dirn
+        unset findcurline
+        notbusy finding
+        set fprogcoord 0
+        adjustprogress
     }
     stopblaming
 }
@@ -6807,41 +6825,41 @@
     global curview varcorder vrownum varccommits vrowmod
 
     if {![info exists find_dirn]} {
-	return 0
+        return 0
     }
     set fldtypes [list [mc "Headline"] [mc "Author"] "" [mc "Committer"] "" [mc "Comments"]]
     set l $findcurline
     set moretodo 0
     if {$find_dirn > 0} {
-	incr l
-	if {$l >= $numcommits} {
-	    set l 0
-	}
-	if {$l <= $findstartline} {
-	    set lim [expr {$findstartline + 1}]
-	} else {
-	    set lim $numcommits
-	    set moretodo $findallowwrap
-	}
+        incr l
+        if {$l >= $numcommits} {
+            set l 0
+        }
+        if {$l <= $findstartline} {
+            set lim [expr {$findstartline + 1}]
+        } else {
+            set lim $numcommits
+            set moretodo $findallowwrap
+        }
     } else {
-	if {$l == 0} {
-	    set l $numcommits
-	}
-	incr l -1
-	if {$l >= $findstartline} {
-	    set lim [expr {$findstartline - 1}]
-	} else {
-	    set lim -1
-	    set moretodo $findallowwrap
-	}
+        if {$l == 0} {
+            set l $numcommits
+        }
+        incr l -1
+        if {$l >= $findstartline} {
+            set lim [expr {$findstartline - 1}]
+        } else {
+            set lim -1
+            set moretodo $findallowwrap
+        }
     }
     set n [expr {($lim - $l) * $find_dirn}]
     if {$n > 500} {
-	set n 500
-	set moretodo 1
+        set n 500
+        set moretodo 1
     }
     if {$l + ($find_dirn > 0? $n: 1) > $vrowmod($curview)} {
-	update_arcrows $curview
+        update_arcrows $curview
     }
     set found 0
     set domore 1
@@ -6851,81 +6869,81 @@
     set ids [lindex $varccommits($curview,$a)]
     set arowend [expr {$arow + [llength $ids]}]
     if {$gdttype eq [mc "containing:"]} {
-	for {} {$n > 0} {incr n -1; incr l $find_dirn} {
-	    if {$l < $arow || $l >= $arowend} {
-		incr ai $find_dirn
-		set a [lindex $varcorder($curview) $ai]
-		set arow [lindex $vrownum($curview) $ai]
-		set ids [lindex $varccommits($curview,$a)]
-		set arowend [expr {$arow + [llength $ids]}]
-	    }
-	    set id [lindex $ids [expr {$l - $arow}]]
-	    # shouldn't happen unless git log doesn't give all the commits...
-	    if {![info exists commitdata($id)] ||
-		![doesmatch $commitdata($id)]} {
-		continue
-	    }
-	    if {![info exists commitinfo($id)]} {
-		getcommit $id
-	    }
-	    set info $commitinfo($id)
-	    foreach f $info ty $fldtypes {
-		if {$ty eq ""} continue
-		if {($findloc eq [mc "All fields"] || $findloc eq $ty) &&
-		    [doesmatch $f]} {
-		    set found 1
-		    break
-		}
-	    }
-	    if {$found} break
-	}
+        for {} {$n > 0} {incr n -1; incr l $find_dirn} {
+            if {$l < $arow || $l >= $arowend} {
+                incr ai $find_dirn
+                set a [lindex $varcorder($curview) $ai]
+                set arow [lindex $vrownum($curview) $ai]
+                set ids [lindex $varccommits($curview,$a)]
+                set arowend [expr {$arow + [llength $ids]}]
+            }
+            set id [lindex $ids [expr {$l - $arow}]]
+            # shouldn't happen unless git log doesn't give all the commits...
+            if {![info exists commitdata($id)] ||
+                ![doesmatch $commitdata($id)]} {
+                continue
+            }
+            if {![info exists commitinfo($id)]} {
+                getcommit $id
+            }
+            set info $commitinfo($id)
+            foreach f $info ty $fldtypes {
+                if {$ty eq ""} continue
+                if {($findloc eq [mc "All fields"] || $findloc eq $ty) &&
+                    [doesmatch $f]} {
+                    set found 1
+                    break
+                }
+            }
+            if {$found} break
+        }
     } else {
-	for {} {$n > 0} {incr n -1; incr l $find_dirn} {
-	    if {$l < $arow || $l >= $arowend} {
-		incr ai $find_dirn
-		set a [lindex $varcorder($curview) $ai]
-		set arow [lindex $vrownum($curview) $ai]
-		set ids [lindex $varccommits($curview,$a)]
-		set arowend [expr {$arow + [llength $ids]}]
-	    }
-	    set id [lindex $ids [expr {$l - $arow}]]
-	    if {![info exists fhighlights($id)]} {
-		# this sets fhighlights($id) to -1
-		askfilehighlight $l $id
-	    }
-	    if {$fhighlights($id) > 0} {
-		set found $domore
-		break
-	    }
-	    if {$fhighlights($id) < 0} {
-		if {$domore} {
-		    set domore 0
-		    set findcurline [expr {$l - $find_dirn}]
-		}
-	    }
-	}
+        for {} {$n > 0} {incr n -1; incr l $find_dirn} {
+            if {$l < $arow || $l >= $arowend} {
+                incr ai $find_dirn
+                set a [lindex $varcorder($curview) $ai]
+                set arow [lindex $vrownum($curview) $ai]
+                set ids [lindex $varccommits($curview,$a)]
+                set arowend [expr {$arow + [llength $ids]}]
+            }
+            set id [lindex $ids [expr {$l - $arow}]]
+            if {![info exists fhighlights($id)]} {
+                # this sets fhighlights($id) to -1
+                askfilehighlight $l $id
+            }
+            if {$fhighlights($id) > 0} {
+                set found $domore
+                break
+            }
+            if {$fhighlights($id) < 0} {
+                if {$domore} {
+                    set domore 0
+                    set findcurline [expr {$l - $find_dirn}]
+                }
+            }
+        }
     }
     if {$found || ($domore && !$moretodo)} {
-	unset findcurline
-	unset find_dirn
-	notbusy finding
-	set fprogcoord 0
-	adjustprogress
-	if {$found} {
-	    findselectline $l
-	} else {
-	    bell
-	}
-	return 0
+        unset findcurline
+        unset find_dirn
+        notbusy finding
+        set fprogcoord 0
+        adjustprogress
+        if {$found} {
+            findselectline $l
+        } else {
+            bell
+        }
+        return 0
     }
     if {!$domore} {
-	flushhighlights
+        flushhighlights
     } else {
-	set findcurline [expr {$l - $find_dirn}]
+        set findcurline [expr {$l - $find_dirn}]
     }
     set n [expr {($findcurline - $findstartline) * $find_dirn - 1}]
     if {$n < 0} {
-	incr n $numcommits
+        incr n $numcommits
     }
     set fprogcoord [expr {$n * 1.0 / $numcommits}]
     adjustprogress
@@ -6939,15 +6957,15 @@
     set findcurline $l
     selectline $l 1
     if {$markingmatches &&
-	($findloc eq [mc "All fields"] || $findloc eq [mc "Comments"])} {
-	# highlight the matches in the comments
-	set f [$ctext get 1.0 $commentend]
-	set matches [findmatches $f]
-	foreach match $matches {
-	    set start [lindex $match 0]
-	    set end [expr {[lindex $match 1] + 1}]
-	    $ctext tag add found "1.0 + $start c" "1.0 + $end c"
-	}
+        ($findloc eq [mc "All fields"] || $findloc eq [mc "Comments"])} {
+        # highlight the matches in the comments
+        set f [$ctext get 1.0 $commentend]
+        set matches [findmatches $f]
+        foreach match $matches {
+            set start [lindex $match 0]
+            set end [expr {[lindex $match 1] + 1}]
+            $ctext tag add found "1.0 + $start c" "1.0 + $end c"
+        }
     }
     drawvisible
 }
@@ -6961,18 +6979,18 @@
     set y0 [lindex $bbox 1]
     set y1 [lindex $bbox 3]
     foreach match $matches {
-	set start [lindex $match 0]
-	set end [lindex $match 1]
-	if {$start > $end} continue
-	set xoff [font measure $font [string range $str 0 [expr {$start-1}]]]
-	set xlen [font measure $font [string range $str 0 [expr {$end}]]]
-	set t [$canv create rect [expr {$x0+$xoff}] $y0 \
-		   [expr {$x0+$xlen+2}] $y1 \
-		   -outline {} -tags [list match$l matches] -fill yellow]
-	$canv lower $t
-	if {$row == $selectedline} {
-	    $canv raise $t secsel
-	}
+        set start [lindex $match 0]
+        set end [lindex $match 1]
+        if {$start > $end} continue
+        set xoff [font measure $font [string range $str 0 [expr {$start-1}]]]
+        set xlen [font measure $font [string range $str 0 [expr {$end}]]]
+        set t [$canv create rect [expr {$x0+$xoff}] $y0 \
+                   [expr {$x0+$xlen+2}] $y1 \
+                   -outline {} -tags [list match$l matches] -fill yellow]
+        $canv lower $t
+        if {$row == $selectedline} {
+            $canv raise $t secsel
+        }
     }
 }
 
@@ -6993,12 +7011,12 @@
     set y [expr {$y + $yfrac * $ymax}]
     set l [expr {int(($y - $canvy0) / $linespc + 0.5)}]
     if {$l < 0} {
-	set l 0
+        set l 0
     }
     if {$w eq $canv} {
-	set xmax [lindex [$canv cget -scrollregion] 2]
-	set xleft [expr {[lindex [$canv xview] 0] * $xmax}]
-	if {![info exists rowtextx($l)] || $xleft + $x < $rowtextx($l)} return
+        set xmax [lindex [$canv cget -scrollregion] 2]
+        set xleft [expr {[lindex [$canv xview] 0] * $xmax}]
+        if {![info exists rowtextx($l)] || $xleft + $x < $rowtextx($l)} return
     }
     unmarkmatches
     selectline $l 1
@@ -7007,11 +7025,11 @@
 proc commit_descriptor {p} {
     global commitinfo
     if {![info exists commitinfo($p)]} {
-	getcommit $p
+        getcommit $p
     }
     set l "..."
     if {[llength $commitinfo($p)] > 1} {
-	set l [lindex $commitinfo($p) 0]
+        set l [lindex $commitinfo($p) 0]
     }
     return "$p ($l)\n"
 }
@@ -7026,26 +7044,26 @@
     $ctext insert end $text $tags
     set links [regexp -indices -all -inline {(?:\m|-g)[0-9a-f]{6,40}\M} $text]
     foreach l $links {
-	set s [lindex $l 0]
-	set e [lindex $l 1]
-	set linkid [string range $text $s $e]
-	incr e
-	$ctext tag delete link$linknum
-	$ctext tag add link$linknum "$start + $s c" "$start + $e c"
-	setlink $linkid link$linknum
-	incr linknum
+        set s [lindex $l 0]
+        set e [lindex $l 1]
+        set linkid [string range $text $s $e]
+        incr e
+        $ctext tag delete link$linknum
+        $ctext tag add link$linknum "$start + $s c" "$start + $e c"
+        setlink $linkid link$linknum
+        incr linknum
     }
     set wlinks [regexp -indices -all -inline -line \
-		    {https?://[^[:space:]]+} $text]
+                    {https?://[^[:space:]]+} $text]
     foreach l $wlinks {
-	set s2 [lindex $l 0]
-	set e2 [lindex $l 1]
-	set url [string range $text $s2 $e2]
-	incr e2
-	$ctext tag delete link$linknum
-	$ctext tag add link$linknum "$start + $s2 c" "$start + $e2 c"
-	setwlink $url link$linknum
-	incr linknum
+        set s2 [lindex $l 0]
+        set e2 [lindex $l 1]
+        set url [string range $text $s2 $e2]
+        incr e2
+        $ctext tag delete link$linknum
+        $ctext tag add link$linknum "$start + $s2 c" "$start + $e2 c"
+        setwlink $url link$linknum
+        incr linknum
     }
 }
 
@@ -7059,23 +7077,23 @@
 
     set known 0
     if {[string length $id] < 40} {
-	set matches [longid $id]
-	if {[llength $matches] > 0} {
-	    if {[llength $matches] > 1} return
-	    set known 1
-	    set id [lindex $matches 0]
-	}
+        set matches [longid $id]
+        if {[llength $matches] > 0} {
+            if {[llength $matches] > 1} return
+            set known 1
+            set id [lindex $matches 0]
+        }
     } else {
-	set known [commitinview $id $curview]
+        set known [commitinview $id $curview]
     }
     if {$known} {
-	$ctext tag conf $lk -foreground $linkfgcolor -underline 1
-	$ctext tag bind $lk <1> [list selbyid $id]
-	$ctext tag bind $lk <Enter> {linkcursor %W 1}
-	$ctext tag bind $lk <Leave> {linkcursor %W -1}
+        $ctext tag conf $lk -foreground $linkfgcolor -underline 1
+        $ctext tag bind $lk <1> [list selbyid $id]
+        $ctext tag bind $lk <Enter> {linkcursor %W 1}
+        $ctext tag bind $lk <Leave> {linkcursor %W -1}
     } else {
-	lappend pendinglinks($id) $lk
-	interestedin $id {makelink %P}
+        lappend pendinglinks($id) $lk
+        interestedin $id {makelink %P}
     }
 }
 
@@ -7107,7 +7125,7 @@
 
     if {![info exists pendinglinks($id)]} return
     foreach lk $pendinglinks($id) {
-	setlink $id $lk
+        setlink $id $lk
     }
     unset pendinglinks($id)
 }
@@ -7116,12 +7134,12 @@
     global linkentercount curtextcursor
 
     if {[incr linkentercount $inc] > 0} {
-	$w configure -cursor hand2
+        $w configure -cursor hand2
     } else {
-	$w configure -cursor $curtextcursor
-	if {$linkentercount < 0} {
-	    set linkentercount 0
-	}
+        $w configure -cursor $curtextcursor
+        if {$linkentercount < 0} {
+            set linkentercount 0
+        }
     }
 }
 
@@ -7131,7 +7149,7 @@
     if {$web_browser eq {}} return
     # Use eval here in case $web_browser is a command plus some arguments
     if {[catch {eval exec $web_browser [list $url] &} err]} {
-	error_popup "[mc "Error starting web browser:"] $err"
+        error_popup "[mc "Error starting web browser:"] $err"
     }
 }
 
@@ -7144,9 +7162,9 @@
     set wtop [expr {[lindex $wnow 0] * $ymax}]
     set newtop [expr {$wtop + $dir * $linespc}]
     if {$newtop < 0} {
-	set newtop 0
+        set newtop 0
     } elseif {$newtop > $ymax} {
-	set newtop $ymax
+        set newtop $ymax
     }
     allcanvs yview moveto [expr {$newtop * 1.0 / $ymax}]
 }
@@ -7157,15 +7175,15 @@
     global ctext linknum curview $var maxrefs visiblerefs mainheadid
 
     if {[catch {$ctext index $pos}]} {
-	return 0
+        return 0
     }
     $ctext conf -state normal
     $ctext delete $pos "$pos lineend"
     set tags {}
     foreach id $ids {
-	foreach tag [set $var\($id\)] {
-	    lappend tags [list $tag $id]
-	}
+        foreach tag [set $var\($id\)] {
+            lappend tags [list $tag $id]
+        }
     }
 
     set sep {}
@@ -7173,44 +7191,44 @@
     set nutags 0
 
     if {[llength $tags] > $maxrefs} {
-	# If we are displaying heads, and there are too many,
-	# see if there are some important heads to display.
-	# Currently that are the current head and heads listed in $visiblerefs option
-	set itags {}
-	if {$var eq "idheads"} {
-	    set utags {}
-	    foreach ti $tags {
-		set hname [lindex $ti 0]
-		set id [lindex $ti 1]
-		if {([lsearch -exact $visiblerefs $hname] != -1 || $id eq $mainheadid) &&
-		    [llength $itags] < $maxrefs} {
-		    lappend itags $ti
-		} else {
-		    lappend utags $ti
-		}
-	    }
-	    set tags $utags
-	}
-	if {$itags ne {}} {
-	    set str [mc "and many more"]
-	    set sep " "
-	} else {
-	    set str [mc "many"]
-	}
-	$ctext insert $pos "$str ([llength $tags])"
-	set nutags [llength $tags]
-	set tags $itags
+        # If we are displaying heads, and there are too many,
+        # see if there are some important heads to display.
+        # Currently that are the current head and heads listed in $visiblerefs option
+        set itags {}
+        if {$var eq "idheads"} {
+            set utags {}
+            foreach ti $tags {
+                set hname [lindex $ti 0]
+                set id [lindex $ti 1]
+                if {([lsearch -exact $visiblerefs $hname] != -1 || $id eq $mainheadid) &&
+                    [llength $itags] < $maxrefs} {
+                    lappend itags $ti
+                } else {
+                    lappend utags $ti
+                }
+            }
+            set tags $utags
+        }
+        if {$itags ne {}} {
+            set str [mc "and many more"]
+            set sep " "
+        } else {
+            set str [mc "many"]
+        }
+        $ctext insert $pos "$str ([llength $tags])"
+        set nutags [llength $tags]
+        set tags $itags
     }
 
     foreach ti $tags {
-	set id [lindex $ti 1]
-	set lk link$linknum
-	incr linknum
-	$ctext tag delete $lk
-	$ctext insert $pos $sep
-	$ctext insert $pos [lindex $ti 0] $lk
-	setlink $id $lk
-	set sep ", "
+        set id [lindex $ti 1]
+        set lk link$linknum
+        incr linknum
+        $ctext tag delete $lk
+        $ctext insert $pos $sep
+        $ctext insert $pos [lindex $ti 0] $lk
+        setlink $id $lk
+        set sep ", "
     }
     $ctext tag add wwrap "$pos linestart" "$pos lineend"
     $ctext conf -state disabled
@@ -7224,11 +7242,11 @@
     if {$selectedline eq {} || !$showneartags} return
     after cancel dispnexttag
     if {$delay} {
-	after 200 dispnexttag
-	set tagphase -1
+        after 200 dispnexttag
+        set tagphase -1
     } else {
-	after idle dispnexttag
-	set tagphase 0
+        after idle dispnexttag
+        set tagphase 0
     }
 }
 
@@ -7237,33 +7255,33 @@
 
     if {$selectedline eq {} || !$showneartags} return
     switch -- $tagphase {
-	0 {
-	    set dtags [desctags $currentid]
-	    if {$dtags ne {}} {
-		appendrefs precedes $dtags idtags
-	    }
-	}
-	1 {
-	    set atags [anctags $currentid]
-	    if {$atags ne {}} {
-		appendrefs follows $atags idtags
-	    }
-	}
-	2 {
-	    set dheads [descheads $currentid]
-	    if {$dheads ne {}} {
-		if {[appendrefs branch $dheads idheads] > 1
-		    && [$ctext get "branch -3c"] eq "h"} {
-		    # turn "Branch" into "Branches"
-		    $ctext conf -state normal
-		    $ctext insert "branch -2c" "es"
-		    $ctext conf -state disabled
-		}
-	    }
-	}
+        0 {
+            set dtags [desctags $currentid]
+            if {$dtags ne {}} {
+                appendrefs precedes $dtags idtags
+            }
+        }
+        1 {
+            set atags [anctags $currentid]
+            if {$atags ne {}} {
+                appendrefs follows $atags idtags
+            }
+        }
+        2 {
+            set dheads [descheads $currentid]
+            if {$dheads ne {}} {
+                if {[appendrefs branch $dheads idheads] > 1
+                    && [$ctext get "branch -3c"] eq "h"} {
+                    # turn "Branch" into "Branches"
+                    $ctext conf -state normal
+                    $ctext insert "branch -2c" "es"
+                    $ctext conf -state disabled
+                }
+            }
+        }
     }
     if {[incr tagphase] <= 2} {
-	after idle dispnexttag
+        after idle dispnexttag
     }
 }
 
@@ -7273,15 +7291,15 @@
     if {![info exists linehtag($id)]} return
     $canv delete secsel
     set t [eval $canv create rect [$canv bbox $linehtag($id)] -outline {{}} \
-	       -tags secsel -fill [$canv cget -selectbackground]]
+               -tags secsel -fill [$canv cget -selectbackground]]
     $canv lower $t
     $canv2 delete secsel
     set t [eval $canv2 create rect [$canv2 bbox $linentag($id)] -outline {{}} \
-	       -tags secsel -fill [$canv2 cget -selectbackground]]
+               -tags secsel -fill [$canv2 cget -selectbackground]]
     $canv2 lower $t
     $canv3 delete secsel
     set t [eval $canv3 create rect [$canv3 bbox $linedtag($id)] -outline {{}} \
-	       -tags secsel -fill [$canv3 cget -selectbackground]]
+               -tags secsel -fill [$canv3 cget -selectbackground]]
     $canv3 lower $t
 }
 
@@ -7291,7 +7309,7 @@
     if {![info exists linehtag($id)]} return
     $canv delete markid
     set t [eval $canv create rect [$canv bbox $linehtag($id)] \
-	       -tags markid -outline $fgcolor]
+               -tags markid -outline $fgcolor]
     $canv raise $t
 }
 
@@ -7318,7 +7336,7 @@
     set selectedline $l
     set currentid $id
     if {$lastscrollrows < $numcommits} {
-	setcanvscroll
+        setcanvscroll
     }
 
     if {$cmitmode ne "patch" && $switch_to_patch} {
@@ -7335,42 +7353,42 @@
     set wh [expr {$wbot - $wtop}]
     set newtop $wtop
     if {$ytop < $wtop} {
-	if {$ybot < $wtop} {
-	    set newtop [expr {$y - $wh / 2.0}]
-	} else {
-	    set newtop $ytop
-	    if {$newtop > $wtop - $linespc} {
-		set newtop [expr {$wtop - $linespc}]
-	    }
-	}
+        if {$ybot < $wtop} {
+            set newtop [expr {$y - $wh / 2.0}]
+        } else {
+            set newtop $ytop
+            if {$newtop > $wtop - $linespc} {
+                set newtop [expr {$wtop - $linespc}]
+            }
+        }
     } elseif {$ybot > $wbot} {
-	if {$ytop > $wbot} {
-	    set newtop [expr {$y - $wh / 2.0}]
-	} else {
-	    set newtop [expr {$ybot - $wh}]
-	    if {$newtop < $wtop + $linespc} {
-		set newtop [expr {$wtop + $linespc}]
-	    }
-	}
+        if {$ytop > $wbot} {
+            set newtop [expr {$y - $wh / 2.0}]
+        } else {
+            set newtop [expr {$ybot - $wh}]
+            if {$newtop < $wtop + $linespc} {
+                set newtop [expr {$wtop + $linespc}]
+            }
+        }
     }
     if {$newtop != $wtop} {
-	if {$newtop < 0} {
-	    set newtop 0
-	}
-	allcanvs yview moveto [expr {$newtop * 1.0 / $ymax}]
-	drawvisible
+        if {$newtop < 0} {
+            set newtop 0
+        }
+        allcanvs yview moveto [expr {$newtop * 1.0 / $ymax}]
+        drawvisible
     }
 
     make_secsel $id
 
     if {$isnew} {
-	addtohistory [list selbyid $id 0] savecmitpos
+        addtohistory [list selbyid $id 0] savecmitpos
     }
 
     $sha1entry delete 0 end
     $sha1entry insert 0 $id
     if {$autoselect} {
-	$sha1entry selection range 0 $autosellen
+        $sha1entry selection range 0 $autosellen
     }
     rhighlight_sel $id
 
@@ -7378,7 +7396,7 @@
     clear_ctext
     set linknum 0
     if {![info exists commitinfo($id)]} {
-	getcommit $id
+        getcommit $id
     }
     set info $commitinfo($id)
     set date [formatdate [lindex $info 2]]
@@ -7386,59 +7404,59 @@
     set date [formatdate [lindex $info 4]]
     $ctext insert end "[mc "Committer"]: [lindex $info 3]  $date\n"
     if {[info exists idtags($id)]} {
-	$ctext insert end [mc "Tags:"]
-	foreach tag $idtags($id) {
-	    $ctext insert end " $tag"
-	}
-	$ctext insert end "\n"
+        $ctext insert end [mc "Tags:"]
+        foreach tag $idtags($id) {
+            $ctext insert end " $tag"
+        }
+        $ctext insert end "\n"
     }
 
     set headers {}
     set olds $parents($curview,$id)
     if {[llength $olds] > 1} {
-	set np 0
-	foreach p $olds {
-	    if {$np >= $mergemax} {
-		set tag mmax
-	    } else {
-		set tag m$np
-	    }
-	    $ctext insert end "[mc "Parent"]: " $tag
-	    appendwithlinks [commit_descriptor $p] {}
-	    incr np
-	}
+        set np 0
+        foreach p $olds {
+            if {$np >= $mergemax} {
+                set tag mmax
+            } else {
+                set tag m$np
+            }
+            $ctext insert end "[mc "Parent"]: " $tag
+            appendwithlinks [commit_descriptor $p] {}
+            incr np
+        }
     } else {
-	foreach p $olds {
-	    append headers "[mc "Parent"]: [commit_descriptor $p]"
-	}
+        foreach p $olds {
+            append headers "[mc "Parent"]: [commit_descriptor $p]"
+        }
     }
 
     foreach c $children($curview,$id) {
-	append headers "[mc "Child"]:  [commit_descriptor $c]"
+        append headers "[mc "Child"]:  [commit_descriptor $c]"
     }
 
     # make anything that looks like a SHA1 ID be a clickable link
     appendwithlinks $headers {}
     if {$showneartags} {
-	if {![info exists allcommits]} {
-	    getallcommits
-	}
-	$ctext insert end "[mc "Branch"]: "
-	$ctext mark set branch "end -1c"
-	$ctext mark gravity branch left
-	$ctext insert end "\n[mc "Follows"]: "
-	$ctext mark set follows "end -1c"
-	$ctext mark gravity follows left
-	$ctext insert end "\n[mc "Precedes"]: "
-	$ctext mark set precedes "end -1c"
-	$ctext mark gravity precedes left
-	$ctext insert end "\n"
-	dispneartags 1
+        if {![info exists allcommits]} {
+            getallcommits
+        }
+        $ctext insert end "[mc "Branch"]: "
+        $ctext mark set branch "end -1c"
+        $ctext mark gravity branch left
+        $ctext insert end "\n[mc "Follows"]: "
+        $ctext mark set follows "end -1c"
+        $ctext mark gravity follows left
+        $ctext insert end "\n[mc "Precedes"]: "
+        $ctext mark set precedes "end -1c"
+        $ctext mark gravity precedes left
+        $ctext insert end "\n"
+        dispneartags 1
     }
     $ctext insert end "\n"
     set comment [lindex $info 5]
     if {[string first "\r" $comment] >= 0} {
-	set comment [string map {"\r" "\n    "} $comment]
+        set comment [string map {"\r" "\n    "} $comment]
     }
     appendwithlinks $comment {comment}
 
@@ -7449,13 +7467,13 @@
     set jump_to_here $desired_loc
     init_flist [mc "Comments"]
     if {$cmitmode eq "tree"} {
-	gettree $id
+        gettree $id
     } elseif {$vinlinediff($curview) == 1} {
-	showinlinediff $id
+        showinlinediff $id
     } elseif {[llength $olds] <= 1} {
-	startdiff $id
+        startdiff $id
     } else {
-	mergediff $id
+        mergediff $id
     }
 }
 
@@ -7485,14 +7503,14 @@
 
     set lpp [expr {([winfo height $canv] - 2) / $linespc}]
     if {$lpp < 1} {
-	set lpp 1
+        set lpp 1
     }
     allcanvs yview scroll [expr {$dir * $lpp}] units
     drawvisible
     if {$selectedline eq {}} return
     set l [expr {$selectedline + $dir * $lpp}]
     if {$l < 0} {
-	set l 0
+        set l 0
     } elseif {$l >= $numcommits} {
         set l [expr $numcommits - 1]
     }
@@ -7513,7 +7531,7 @@
     global selectedline
 
     if {$selectedline ne {}} {
-	selectline $selectedline 0
+        selectline $selectedline 0
     }
 }
 
@@ -7524,20 +7542,20 @@
     save_position
     set elt [list $curview $cmd $saveproc {}]
     if {$historyindex > 0
-	&& [lindex $history [expr {$historyindex - 1}]] == $elt} {
-	return
+        && [lindex $history [expr {$historyindex - 1}]] == $elt} {
+        return
     }
 
     if {$historyindex < [llength $history]} {
-	set history [lreplace $history $historyindex end $elt]
+        set history [lreplace $history $historyindex end $elt]
     } else {
-	lappend history $elt
+        lappend history $elt
     }
     incr historyindex
     if {$historyindex > 1} {
-	.tf.bar.leftbut conf -state normal
+        .tf.bar.leftbut conf -state normal
     } else {
-	.tf.bar.leftbut conf -state disabled
+        .tf.bar.leftbut conf -state disabled
     }
     .tf.bar.rightbut conf -state disabled
 }
@@ -7550,7 +7568,7 @@
     set hi [expr {$historyindex - 1}]
     set fn [lindex $history $hi 2]
     if {$fn ne {}} {
-	lset history $hi 3 [eval $fn]
+        lset history $hi 3 [eval $fn]
     }
 }
 
@@ -7558,11 +7576,11 @@
     global last_posvars
 
     if {[info exists last_posvars]} {
-	foreach {var val} $last_posvars {
-	    global $var
-	    unset -nocomplain $var
-	}
-	unset last_posvars
+        foreach {var val} $last_posvars {
+            global $var
+            unset -nocomplain $var
+        }
+        unset last_posvars
     }
 }
 
@@ -7573,12 +7591,12 @@
     set cmd [lindex $elt 1]
     set pv [lindex $elt 3]
     if {$curview != $view} {
-	showview $view
+        showview $view
     }
     unset_posvars
     foreach {var val} $pv {
-	global $var
-	set $var $val
+        global $var
+        set $var $val
     }
     set last_posvars $pv
     eval $cmd
@@ -7589,13 +7607,13 @@
     focus .
 
     if {$historyindex > 1} {
-	save_position
-	incr historyindex -1
-	godo [lindex $history [expr {$historyindex - 1}]]
-	.tf.bar.rightbut conf -state normal
+        save_position
+        incr historyindex -1
+        godo [lindex $history [expr {$historyindex - 1}]]
+        .tf.bar.rightbut conf -state normal
     }
     if {$historyindex <= 1} {
-	.tf.bar.leftbut conf -state disabled
+        .tf.bar.leftbut conf -state disabled
     }
 }
 
@@ -7604,14 +7622,14 @@
     focus .
 
     if {$historyindex < [llength $history]} {
-	save_position
-	set cmd [lindex $history $historyindex]
-	incr historyindex
-	godo $cmd
-	.tf.bar.leftbut conf -state normal
+        save_position
+        set cmd [lindex $history $historyindex]
+        incr historyindex
+        godo $cmd
+        .tf.bar.leftbut conf -state normal
     }
     if {$historyindex >= [llength $history]} {
-	.tf.bar.rightbut conf -state disabled
+        .tf.bar.rightbut conf -state disabled
     }
 }
 
@@ -7619,7 +7637,7 @@
     global parents curview targetid
     set ps $parents($curview,$targetid)
     if {[llength $ps] >= $i} {
-	selbyid [lindex $ps [expr $i - 1]]
+        selbyid [lindex $ps [expr $i - 1]]
     }
 }
 
@@ -7630,25 +7648,25 @@
     set diffids $id
     unset -nocomplain diffmergeid
     if {![info exists treefilelist($id)]} {
-	if {![info exists treepending]} {
-	    if {$id eq $nullid} {
-		set cmd [list | git ls-files]
-	    } elseif {$id eq $nullid2} {
-		set cmd [list | git ls-files --stage -t]
-	    } else {
-		set cmd [list | git ls-tree -r $id]
-	    }
-	    if {[catch {set gtf [open $cmd r]}]} {
-		return
-	    }
-	    set treepending $id
-	    set treefilelist($id) {}
-	    set treeidlist($id) {}
-	    fconfigure $gtf -blocking 0 -encoding binary
-	    filerun $gtf [list gettreeline $gtf $id]
-	}
+        if {![info exists treepending]} {
+            if {$id eq $nullid} {
+                set cmd [list | git ls-files]
+            } elseif {$id eq $nullid2} {
+                set cmd [list | git ls-files --stage -t]
+            } else {
+                set cmd [list | git ls-tree -r $id]
+            }
+            if {[catch {set gtf [open $cmd r]}]} {
+                return
+            }
+            set treepending $id
+            set treefilelist($id) {}
+            set treeidlist($id) {}
+            fconfigure $gtf -blocking 0 -encoding binary
+            filerun $gtf [list gettreeline $gtf $id]
+        }
     } else {
-	setfilelist $id
+        setfilelist $id
     }
 }
 
@@ -7657,36 +7675,36 @@
 
     set nl 0
     while {[incr nl] <= 1000 && [gets $gtf line] >= 0} {
-	if {$diffids eq $nullid} {
-	    set fname $line
-	} else {
-	    set i [string first "\t" $line]
-	    if {$i < 0} continue
-	    set fname [string range $line [expr {$i+1}] end]
-	    set line [string range $line 0 [expr {$i-1}]]
-	    if {$diffids ne $nullid2 && [lindex $line 1] ne "blob"} continue
-	    set sha1 [lindex $line 2]
-	    lappend treeidlist($id) $sha1
-	}
-	if {[string index $fname 0] eq "\""} {
-	    set fname [lindex $fname 0]
-	}
-	set fname [encoding convertfrom $fname]
-	lappend treefilelist($id) $fname
+        if {$diffids eq $nullid} {
+            set fname $line
+        } else {
+            set i [string first "\t" $line]
+            if {$i < 0} continue
+            set fname [string range $line [expr {$i+1}] end]
+            set line [string range $line 0 [expr {$i-1}]]
+            if {$diffids ne $nullid2 && [lindex $line 1] ne "blob"} continue
+            set sha1 [lindex $line 2]
+            lappend treeidlist($id) $sha1
+        }
+        if {[string index $fname 0] eq "\""} {
+            set fname [lindex $fname 0]
+        }
+        set fname [encoding convertfrom $fname]
+        lappend treefilelist($id) $fname
     }
     if {![eof $gtf]} {
-	return [expr {$nl >= 1000? 2: 1}]
+        return [expr {$nl >= 1000? 2: 1}]
     }
     close $gtf
     unset treepending
     if {$cmitmode ne "tree"} {
-	if {![info exists diffmergeid]} {
-	    gettreediffs $diffids
-	}
+        if {![info exists diffmergeid]} {
+            gettreediffs $diffids
+        }
     } elseif {$id ne $diffids} {
-	gettree $diffids
+        gettree $diffids
     } else {
-	setfilelist $id
+        setfilelist $id
     }
     return 0
 }
@@ -7698,20 +7716,20 @@
 
     set i [lsearch -exact $treefilelist($diffids) $f]
     if {$i < 0} {
-	puts "oops, $f not in list for id $diffids"
-	return
+        puts "oops, $f not in list for id $diffids"
+        return
     }
     if {$diffids eq $nullid} {
-	if {[catch {set bf [open $f r]} err]} {
-	    puts "oops, can't read $f: $err"
-	    return
-	}
+        if {[catch {set bf [open $f r]} err]} {
+            puts "oops, can't read $f: $err"
+            return
+        }
     } else {
-	set blob [lindex $treeidlist($diffids) $i]
-	if {[catch {set bf [open [concat | git cat-file blob $blob] r]} err]} {
-	    puts "oops, error reading blob $blob: $err"
-	    return
-	}
+        set blob [lindex $treeidlist($diffids) $i]
+        if {[catch {set bf [open [concat | git cat-file blob $blob] r]} err]} {
+            puts "oops, error reading blob $blob: $err"
+            return
+        }
     }
     fconfigure $bf -blocking 0 -encoding [get_path_encoding $f]
     filerun $bf [list getblobline $bf $diffids]
@@ -7730,28 +7748,28 @@
     global diffids cmitmode ctext
 
     if {$id ne $diffids || $cmitmode ne "tree"} {
-	catch {close $bf}
-	return 0
+        catch {close $bf}
+        return 0
     }
     $ctext config -state normal
     set nl 0
     while {[incr nl] <= 1000 && [gets $bf line] >= 0} {
-	$ctext insert end "$line\n"
+        $ctext insert end "$line\n"
     }
     if {[eof $bf]} {
-	global jump_to_here ctext_file_names commentend
+        global jump_to_here ctext_file_names commentend
 
-	# delete last newline
-	$ctext delete "end - 2c" "end - 1c"
-	close $bf
-	if {$jump_to_here ne {} &&
-	    [lindex $jump_to_here 0] eq [lindex $ctext_file_names 0]} {
-	    set lnum [expr {[lindex $jump_to_here 1] +
-			    [lindex [split $commentend .] 0]}]
-	    mark_ctext_line $lnum
-	}
-	$ctext config -state disabled
-	return 0
+        # delete last newline
+        $ctext delete "end - 2c" "end - 1c"
+        close $bf
+        if {$jump_to_here ne {} &&
+            [lindex $jump_to_here 0] eq [lindex $ctext_file_names 0]} {
+            set lnum [expr {[lindex $jump_to_here 1] +
+                            [lindex [split $commentend .] 0]}]
+            mark_ctext_line $lnum
+        }
+        $ctext config -state disabled
+        return 0
     }
     $ctext config -state disabled
     return [expr {$nl >= 1000? 2: 1}]
@@ -7786,13 +7804,13 @@
     set diffids $ids
     unset -nocomplain diffmergeid
     if {![info exists treediffs($ids)] ||
-	[lsearch -exact $ids $nullid] >= 0 ||
-	[lsearch -exact $ids $nullid2] >= 0} {
-	if {![info exists treepending]} {
-	    gettreediffs $ids
-	}
+        [lsearch -exact $ids $nullid] >= 0 ||
+        [lsearch -exact $ids $nullid2] >= 0} {
+        if {![info exists treepending]} {
+            gettreediffs $ids
+        }
     } else {
-	addtocflist $ids
+        addtocflist $ids
     }
 }
 
@@ -7809,13 +7827,13 @@
 
     set inhdr 0
     foreach line $difflines {
-	if {![string compare -length 5 "diff " $line]} {
-	    set inhdr 1
-	} elseif {$inhdr && ![string compare -length 4 "+++ " $line]} {
-	    # offset also accounts for the b/ prefix
-	    lappend treediff [string range $line 6 end]
-	    set inhdr 0
-	}
+        if {![string compare -length 5 "diff " $line]} {
+            set inhdr 1
+        } elseif {$inhdr && ![string compare -length 4 "+++ " $line]} {
+            # offset also accounts for the b/ prefix
+            lappend treediff [string range $line 6 end]
+            set inhdr 0
+        }
     }
 
     set treediffs($ids) $treediff
@@ -7823,7 +7841,7 @@
 
     $ctext conf -state normal
     foreach line $difflines {
-	parseblobdiffline $ids $line
+        parseblobdiffline $ids $line
     }
     maybe_scroll_ctext 1
     $ctext conf -state disabled
@@ -7834,11 +7852,11 @@
 proc path_filter {filter name} {
     set worktree [gitworktree]
     foreach p $filter {
-	set fq_p [file normalize $p]
-	set fq_n [file normalize [file join $worktree $name]]
-	if {[string match [file normalize $fq_p]* $fq_n]} {
-	    return 1
-	}
+        set fq_p [file normalize $p]
+        set fq_n [file normalize [file join $worktree $name]]
+        if {[string match [file normalize $fq_p]* $fq_n]} {
+            return 1
+        }
     }
     return 0
 }
@@ -7856,42 +7874,42 @@
     set i [lsearch -exact $ids $nullid]
     set j [lsearch -exact $ids $nullid2]
     if {$i >= 0} {
-	if {[llength $ids] > 1 && $j < 0} {
-	    # comparing working directory with some specific revision
-	    set cmd [concat | git diff-index $flags]
-	    if {$i == 0} {
-		lappend cmd -R [lindex $ids 1]
-	    } else {
-		lappend cmd [lindex $ids 0]
-	    }
-	} else {
-	    # comparing working directory with index
-	    set cmd [concat | git diff-files $flags]
-	    if {$j == 1} {
-		lappend cmd -R
-	    }
-	}
+        if {[llength $ids] > 1 && $j < 0} {
+            # comparing working directory with some specific revision
+            set cmd [concat | git diff-index $flags]
+            if {$i == 0} {
+                lappend cmd -R [lindex $ids 1]
+            } else {
+                lappend cmd [lindex $ids 0]
+            }
+        } else {
+            # comparing working directory with index
+            set cmd [concat | git diff-files $flags]
+            if {$j == 1} {
+                lappend cmd -R
+            }
+        }
     } elseif {$j >= 0} {
-	if {[package vcompare $git_version "1.7.2"] >= 0} {
-	    set flags "$flags --ignore-submodules=dirty"
-	}
-	set cmd [concat | git diff-index --cached $flags]
-	if {[llength $ids] > 1} {
-	    # comparing index with specific revision
-	    if {$j == 0} {
-		lappend cmd -R [lindex $ids 1]
-	    } else {
-		lappend cmd [lindex $ids 0]
-	    }
-	} else {
-	    # comparing index with HEAD
-	    lappend cmd HEAD
-	}
+        if {[package vcompare $git_version "1.7.2"] >= 0} {
+            set flags "$flags --ignore-submodules=dirty"
+        }
+        set cmd [concat | git diff-index --cached $flags]
+        if {[llength $ids] > 1} {
+            # comparing index with specific revision
+            if {$j == 0} {
+                lappend cmd -R [lindex $ids 1]
+            } else {
+                lappend cmd [lindex $ids 0]
+            }
+        } else {
+            # comparing index with HEAD
+            lappend cmd HEAD
+        }
     } else {
-	if {$log_showroot} {
-	    lappend flags --root
-	}
-	set cmd [concat | git diff-tree -r $flags $ids]
+        if {$log_showroot} {
+            lappend flags --root
+        }
+        set cmd [concat | git diff-tree -r $flags $ids]
     }
     return $cmd
 }
@@ -7901,7 +7919,7 @@
 
     set cmd [diffcmd $ids {--no-commit-id}]
     if {$limitdiffs && $vfilelimit($curview) ne {}} {
-	    set cmd [concat $cmd -- $vfilelimit($curview)]
+            set cmd [concat $cmd -- $vfilelimit($curview)]
     }
     if {[catch {set gdtf [open $cmd r]}]} return
 
@@ -7919,44 +7937,44 @@
     set sublist {}
     set max 1000
     if {$perfile_attrs} {
-	# cache_gitattr is slow, and even slower on win32 where we
-	# have to invoke it for only about 30 paths at a time
-	set max 500
-	if {[tk windowingsystem] == "win32"} {
-	    set max 120
-	}
+        # cache_gitattr is slow, and even slower on win32 where we
+        # have to invoke it for only about 30 paths at a time
+        set max 500
+        if {[tk windowingsystem] == "win32"} {
+            set max 120
+        }
     }
     while {[incr nr] <= $max && [gets $gdtf line] >= 0} {
-	set i [string first "\t" $line]
-	if {$i >= 0} {
-	    set file [string range $line [expr {$i+1}] end]
-	    if {[string index $file 0] eq "\""} {
-		set file [lindex $file 0]
-	    }
-	    set file [encoding convertfrom $file]
-	    if {$file ne [lindex $treediff end]} {
-		lappend treediff $file
-		lappend sublist $file
-	    }
-	}
+        set i [string first "\t" $line]
+        if {$i >= 0} {
+            set file [string range $line [expr {$i+1}] end]
+            if {[string index $file 0] eq "\""} {
+                set file [lindex $file 0]
+            }
+            set file [encoding convertfrom $file]
+            if {$file ne [lindex $treediff end]} {
+                lappend treediff $file
+                lappend sublist $file
+            }
+        }
     }
     if {$perfile_attrs} {
-	cache_gitattr encoding $sublist
+        cache_gitattr encoding $sublist
     }
     if {![eof $gdtf]} {
-	return [expr {$nr >= $max? 2: 1}]
+        return [expr {$nr >= $max? 2: 1}]
     }
     close $gdtf
     set treediffs($ids) $treediff
     unset treepending
     if {$cmitmode eq "tree" && [llength $diffids] == 1} {
-	gettree $diffids
+        gettree $diffids
     } elseif {$ids != $diffids} {
-	if {![info exists diffmergeid]} {
-	    gettreediffs $diffids
-	}
+        if {![info exists diffmergeid]} {
+            gettreediffs $diffids
+        }
     } else {
-	addtocflist $ids
+        addtocflist $ids
     }
     return 0
 }
@@ -7970,10 +7988,10 @@
     global diffcontextstring diffcontext
 
     if {[string is integer -strict $diffcontextstring]} {
-	if {$diffcontextstring >= 0} {
-	    set diffcontext $diffcontextstring
-	    reselectline
-	}
+        if {$diffcontextstring >= 0} {
+            set diffcontext $diffcontextstring
+            reselectline
+        }
     }
 }
 
@@ -8007,25 +8025,25 @@
 
     set textconv {}
     if {[package vcompare $git_version "1.6.1"] >= 0} {
-	set textconv "--textconv"
+        set textconv "--textconv"
     }
     set submodule {}
     if {[package vcompare $git_version "1.6.6"] >= 0} {
-	set submodule "--submodule"
+        set submodule "--submodule"
     }
     set cmd [diffcmd $ids "-p $textconv $submodule  -C --cc --no-commit-id -U$diffcontext"]
     if {$ignorespace} {
-	append cmd " -w"
+        append cmd " -w"
     }
     if {$worddiff ne [mc "Line diff"]} {
-	append cmd " --word-diff=porcelain"
+        append cmd " --word-diff=porcelain"
     }
     if {$limitdiffs && $vfilelimit($curview) ne {}} {
-	set cmd [concat $cmd -- $vfilelimit($curview)]
+        set cmd [concat $cmd -- $vfilelimit($curview)]
     }
     if {[catch {set bdf [open $cmd r]} err]} {
-	error_popup [mc "Error getting diffs: %s" $err]
-	return
+        error_popup [mc "Error getting diffs: %s" $err]
+        return
     }
     fconfigure $bdf -blocking 0 -encoding binary -eofchar {}
     set blobdifffd($ids) $bdf
@@ -8037,7 +8055,7 @@
     global ctext cmitmode
 
     if {$cmitmode eq "tree"} {
-	return {}
+        return {}
     }
     return [list target_scrollpos [$ctext index @0,0]]
 }
@@ -8053,9 +8071,9 @@
 
     if {![info exists target_scrollpos]} return
     if {!$ateof} {
-	set nlines [expr {[winfo height $ctext]
-			  / [font metrics textfont -linespace]}]
-	if {[$ctext compare "$target_scrollpos + $nlines lines" <= end]} return
+        set nlines [expr {[winfo height $ctext]
+                          / [font metrics textfont -linespace]}]
+        if {[$ctext compare "$target_scrollpos + $nlines lines" <= end]} return
     }
     $ctext yview $target_scrollpos
     unset target_scrollpos
@@ -8065,12 +8083,12 @@
     global $var
 
     while {[llength [set $var]] < $i} {
-	lappend $var {}
+        lappend $var {}
     }
     if {[llength [set $var]] == $i} {
-	lappend $var $val
+        lappend $var $val
     } else {
-	lset $var $i $val
+        lset $var $i $val
     }
 }
 
@@ -8082,7 +8100,7 @@
     set diffencoding [get_path_encoding $fname]
     set i [lsearch -exact $treediffs($ids) $fname]
     if {$i >= 0} {
-	setinlist difffilestart $i $curdiffstart
+        setinlist difffilestart $i $curdiffstart
     }
     lset ctext_file_names end $fname
     set l [expr {(78 - [string length $fname]) / 2}]
@@ -8090,7 +8108,7 @@
     $ctext insert $curdiffstart "$pad $fname $pad" filesep
     set targetline {}
     if {$jump_to_here ne {} && [lindex $jump_to_here 0] eq $fname} {
-	set targetline [lindex $jump_to_here 1]
+        set targetline [lindex $jump_to_here 1]
     }
     set diffline 0
 }
@@ -8098,7 +8116,7 @@
 proc blobdiffmaybeseehere {ateof} {
     global diffseehere
     if {$diffseehere >= 0} {
-	mark_ctext_line [lindex [split $diffseehere .] 0]
+        mark_ctext_line [lindex [split $diffseehere .] 0]
     }
     maybe_scroll_ctext $ateof
 }
@@ -8110,22 +8128,22 @@
     set nr 0
     $ctext conf -state normal
     while {[incr nr] <= 1000 && [gets $bdf line] >= 0} {
-	if {$ids != $diffids || $bdf != $blobdifffd($ids)} {
-	    # Older diff read. Abort it.
-	    catch {close $bdf}
-	    if {$ids != $diffids} {
-		array unset blobdifffd $ids
-	    }
-	    return 0
-	}
-	parseblobdiffline $ids $line
+        if {$ids != $diffids || $bdf != $blobdifffd($ids)} {
+            # Older diff read. Abort it.
+            catch {close $bdf}
+            if {$ids != $diffids} {
+                array unset blobdifffd $ids
+            }
+            return 0
+        }
+        parseblobdiffline $ids $line
     }
     $ctext conf -state disabled
     blobdiffmaybeseehere [eof $bdf]
     if {[eof $bdf]} {
-	catch {close $bdf}
-	array unset blobdifffd $ids
-	return 0
+        catch {close $bdf}
+        array unset blobdifffd $ids
+        return 0
     }
     return [expr {$nr >= 1000? 2: 1}]
 }
@@ -8139,199 +8157,199 @@
     global worddiff diffseehere
 
     if {![string compare -length 5 "diff " $line]} {
-	if {![regexp {^diff (--cc|--git) } $line m type]} {
-	    set line [encoding convertfrom $line]
-	    $ctext insert end "$line\n" hunksep
-	    continue
-	}
-	# start of a new file
-	set diffinhdr 1
-	$ctext insert end "\n"
-	set curdiffstart [$ctext index "end - 1c"]
-	lappend ctext_file_names ""
-	lappend ctext_file_lines [lindex [split $curdiffstart "."] 0]
-	$ctext insert end "\n" filesep
+        if {![regexp {^diff (--cc|--git) } $line m type]} {
+            set line [encoding convertfrom $line]
+            $ctext insert end "$line\n" hunksep
+            continue
+        }
+        # start of a new file
+        set diffinhdr 1
+        set currdiffsubmod ""
 
-	if {$type eq "--cc"} {
-	    # start of a new file in a merge diff
-	    set fname [string range $line 10 end]
-	    if {[lsearch -exact $treediffs($ids) $fname] < 0} {
-		lappend treediffs($ids) $fname
-		add_flist [list $fname]
-	    }
+        $ctext insert end "\n"
+        set curdiffstart [$ctext index "end - 1c"]
+        lappend ctext_file_names ""
+        lappend ctext_file_lines [lindex [split $curdiffstart "."] 0]
+        $ctext insert end "\n" filesep
 
-	} else {
-	    set line [string range $line 11 end]
-	    # If the name hasn't changed the length will be odd,
-	    # the middle char will be a space, and the two bits either
-	    # side will be a/name and b/name, or "a/name" and "b/name".
-	    # If the name has changed we'll get "rename from" and
-	    # "rename to" or "copy from" and "copy to" lines following
-	    # this, and we'll use them to get the filenames.
-	    # This complexity is necessary because spaces in the
-	    # filename(s) don't get escaped.
-	    set l [string length $line]
-	    set i [expr {$l / 2}]
-	    if {!(($l & 1) && [string index $line $i] eq " " &&
-		  [string range $line 2 [expr {$i - 1}]] eq \
-		      [string range $line [expr {$i + 3}] end])} {
-		return
-	    }
-	    # unescape if quoted and chop off the a/ from the front
-	    if {[string index $line 0] eq "\""} {
-		set fname [string range [lindex $line 0] 2 end]
-	    } else {
-		set fname [string range $line 2 [expr {$i - 1}]]
-	    }
-	}
-	makediffhdr $fname $ids
+        if {$type eq "--cc"} {
+            # start of a new file in a merge diff
+            set fname [string range $line 10 end]
+            if {[lsearch -exact $treediffs($ids) $fname] < 0} {
+                lappend treediffs($ids) $fname
+                add_flist [list $fname]
+            }
+
+        } else {
+            set line [string range $line 11 end]
+            # If the name hasn't changed the length will be odd,
+            # the middle char will be a space, and the two bits either
+            # side will be a/name and b/name, or "a/name" and "b/name".
+            # If the name has changed we'll get "rename from" and
+            # "rename to" or "copy from" and "copy to" lines following
+            # this, and we'll use them to get the filenames.
+            # This complexity is necessary because spaces in the
+            # filename(s) don't get escaped.
+            set l [string length $line]
+            set i [expr {$l / 2}]
+            if {!(($l & 1) && [string index $line $i] eq " " &&
+                  [string range $line 2 [expr {$i - 1}]] eq \
+                      [string range $line [expr {$i + 3}] end])} {
+                return
+            }
+            # unescape if quoted and chop off the a/ from the front
+            if {[string index $line 0] eq "\""} {
+                set fname [string range [lindex $line 0] 2 end]
+            } else {
+                set fname [string range $line 2 [expr {$i - 1}]]
+            }
+        }
+        makediffhdr $fname $ids
 
     } elseif {![string compare -length 16 "* Unmerged path " $line]} {
-	set fname [encoding convertfrom [string range $line 16 end]]
-	$ctext insert end "\n"
-	set curdiffstart [$ctext index "end - 1c"]
-	lappend ctext_file_names $fname
-	lappend ctext_file_lines [lindex [split $curdiffstart "."] 0]
-	$ctext insert end "$line\n" filesep
-	set i [lsearch -exact $treediffs($ids) $fname]
-	if {$i >= 0} {
-	    setinlist difffilestart $i $curdiffstart
-	}
+        set fname [encoding convertfrom [string range $line 16 end]]
+        $ctext insert end "\n"
+        set curdiffstart [$ctext index "end - 1c"]
+        lappend ctext_file_names $fname
+        lappend ctext_file_lines [lindex [split $curdiffstart "."] 0]
+        $ctext insert end "$line\n" filesep
+        set i [lsearch -exact $treediffs($ids) $fname]
+        if {$i >= 0} {
+            setinlist difffilestart $i $curdiffstart
+        }
 
     } elseif {![string compare -length 2 "@@" $line]} {
-	regexp {^@@+} $line ats
-	set line [encoding convertfrom $diffencoding $line]
-	$ctext insert end "$line\n" hunksep
-	if {[regexp { \+(\d+),\d+ @@} $line m nl]} {
-	    set diffline $nl
-	}
-	set diffnparents [expr {[string length $ats] - 1}]
-	set diffinhdr 0
+        regexp {^@@+} $line ats
+        set line [encoding convertfrom $diffencoding $line]
+        $ctext insert end "$line\n" hunksep
+        if {[regexp { \+(\d+),\d+ @@} $line m nl]} {
+            set diffline $nl
+        }
+        set diffnparents [expr {[string length $ats] - 1}]
+        set diffinhdr 0
 
     } elseif {![string compare -length 10 "Submodule " $line]} {
-	# start of a new submodule
-	if {[regexp -indices "\[0-9a-f\]+\\.\\." $line nameend]} {
-	    set fname [string range $line 10 [expr [lindex $nameend 0] - 2]]
-	} else {
-	    set fname [string range $line 10 [expr [string first "contains " $line] - 2]]
-	}
-	if {$currdiffsubmod != $fname} {
-	    $ctext insert end "\n";     # Add newline after commit message
-	}
-	set curdiffstart [$ctext index "end - 1c"]
-	lappend ctext_file_names ""
-	if {$currdiffsubmod != $fname} {
-	    lappend ctext_file_lines $fname
-	    makediffhdr $fname $ids
-	    set currdiffsubmod $fname
-	    $ctext insert end "\n$line\n" filesep
-	} else {
-	    $ctext insert end "$line\n" filesep
-	}
+        # start of a new submodule
+        if {[regexp -indices "\[0-9a-f\]+\\.\\." $line nameend]} {
+            set fname [string range $line 10 [expr [lindex $nameend 0] - 2]]
+        } else {
+            set fname [string range $line 10 [expr [string first "contains " $line] - 2]]
+        }
+        if {$currdiffsubmod != $fname} {
+            $ctext insert end "\n";     # Add newline after commit message
+        }
+        if {$currdiffsubmod != $fname} {
+            set curdiffstart [$ctext index "end - 1c"]
+            lappend ctext_file_names ""
+            lappend ctext_file_lines [lindex [split $curdiffstart "."] 0]
+            makediffhdr $fname $ids
+            set currdiffsubmod $fname
+            $ctext insert end "\n$line\n" filesep
+        } else {
+            $ctext insert end "$line\n" filesep
+        }
     } elseif {$currdiffsubmod != "" && ![string compare -length 3 "  >" $line]} {
-	set $currdiffsubmod ""
-	set line [encoding convertfrom $diffencoding $line]
-	$ctext insert end "$line\n" dresult
+        set line [encoding convertfrom $diffencoding $line]
+        $ctext insert end "$line\n" dresult
     } elseif {$currdiffsubmod != "" && ![string compare -length 3 "  <" $line]} {
-	set $currdiffsubmod ""
-	set line [encoding convertfrom $diffencoding $line]
-	$ctext insert end "$line\n" d0
+        set line [encoding convertfrom $diffencoding $line]
+        $ctext insert end "$line\n" d0
     } elseif {$diffinhdr} {
-	if {![string compare -length 12 "rename from " $line]} {
-	    set fname [string range $line [expr 6 + [string first " from " $line] ] end]
-	    if {[string index $fname 0] eq "\""} {
-		set fname [lindex $fname 0]
-	    }
-	    set fname [encoding convertfrom $fname]
-	    set i [lsearch -exact $treediffs($ids) $fname]
-	    if {$i >= 0} {
-		setinlist difffilestart $i $curdiffstart
-	    }
-	} elseif {![string compare -length 10 $line "rename to "] ||
-		  ![string compare -length 8 $line "copy to "]} {
-	    set fname [string range $line [expr 4 + [string first " to " $line] ] end]
-	    if {[string index $fname 0] eq "\""} {
-		set fname [lindex $fname 0]
-	    }
-	    makediffhdr $fname $ids
-	} elseif {[string compare -length 3 $line "---"] == 0} {
-	    # do nothing
-	    return
-	} elseif {[string compare -length 3 $line "+++"] == 0} {
-	    set diffinhdr 0
-	    return
-	}
-	$ctext insert end "$line\n" filesep
+        if {![string compare -length 12 "rename from " $line]} {
+            set fname [string range $line [expr 6 + [string first " from " $line] ] end]
+            if {[string index $fname 0] eq "\""} {
+                set fname [lindex $fname 0]
+            }
+            set fname [encoding convertfrom $fname]
+            set i [lsearch -exact $treediffs($ids) $fname]
+            if {$i >= 0} {
+                setinlist difffilestart $i $curdiffstart
+            }
+        } elseif {![string compare -length 10 $line "rename to "] ||
+                  ![string compare -length 8 $line "copy to "]} {
+            set fname [string range $line [expr 4 + [string first " to " $line] ] end]
+            if {[string index $fname 0] eq "\""} {
+                set fname [lindex $fname 0]
+            }
+            makediffhdr $fname $ids
+        } elseif {[string compare -length 3 $line "---"] == 0} {
+            # do nothing
+            return
+        } elseif {[string compare -length 3 $line "+++"] == 0} {
+            set diffinhdr 0
+            return
+        }
+        $ctext insert end "$line\n" filesep
 
     } else {
-	set line [string map {\x1A ^Z} \
-		      [encoding convertfrom $diffencoding $line]]
-	# parse the prefix - one ' ', '-' or '+' for each parent
-	set prefix [string range $line 0 [expr {$diffnparents - 1}]]
-	set tag [expr {$diffnparents > 1? "m": "d"}]
-	set dowords [expr {$worddiff ne [mc "Line diff"] && $diffnparents == 1}]
-	set words_pre_markup ""
-	set words_post_markup ""
-	if {[string trim $prefix " -+"] eq {}} {
-	    # prefix only has " ", "-" and "+" in it: normal diff line
-	    set num [string first "-" $prefix]
-	    if {$dowords} {
-		set line [string range $line 1 end]
-	    }
-	    if {$num >= 0} {
-		# removed line, first parent with line is $num
-		if {$num >= $mergemax} {
-		    set num "max"
-		}
-		if {$dowords && $worddiff eq [mc "Markup words"]} {
-		    $ctext insert end "\[-$line-\]" $tag$num
-		} else {
-		    $ctext insert end "$line" $tag$num
-		}
-		if {!$dowords} {
-		    $ctext insert end "\n" $tag$num
-		}
-	    } else {
-		set tags {}
-		if {[string first "+" $prefix] >= 0} {
-		    # added line
-		    lappend tags ${tag}result
-		    if {$diffnparents > 1} {
-			set num [string first " " $prefix]
-			if {$num >= 0} {
-			    if {$num >= $mergemax} {
-				set num "max"
-			    }
-			    lappend tags m$num
-			}
-		    }
-		    set words_pre_markup "{+"
-		    set words_post_markup "+}"
-		}
-		if {$targetline ne {}} {
-		    if {$diffline == $targetline} {
-			set diffseehere [$ctext index "end - 1 chars"]
-			set targetline {}
-		    } else {
-			incr diffline
-		    }
-		}
-		if {$dowords && $worddiff eq [mc "Markup words"]} {
-		    $ctext insert end "$words_pre_markup$line$words_post_markup" $tags
-		} else {
-		    $ctext insert end "$line" $tags
-		}
-		if {!$dowords} {
-		    $ctext insert end "\n" $tags
-		}
-	    }
-	} elseif {$dowords && $prefix eq "~"} {
-	    $ctext insert end "\n" {}
-	} else {
-	    # "\ No newline at end of file",
-	    # or something else we don't recognize
-	    $ctext insert end "$line\n" hunksep
-	}
+        set line [string map {\x1A ^Z} \
+                      [encoding convertfrom $diffencoding $line]]
+        # parse the prefix - one ' ', '-' or '+' for each parent
+        set prefix [string range $line 0 [expr {$diffnparents - 1}]]
+        set tag [expr {$diffnparents > 1? "m": "d"}]
+        set dowords [expr {$worddiff ne [mc "Line diff"] && $diffnparents == 1}]
+        set words_pre_markup ""
+        set words_post_markup ""
+        if {[string trim $prefix " -+"] eq {}} {
+            # prefix only has " ", "-" and "+" in it: normal diff line
+            set num [string first "-" $prefix]
+            if {$dowords} {
+                set line [string range $line 1 end]
+            }
+            if {$num >= 0} {
+                # removed line, first parent with line is $num
+                if {$num >= $mergemax} {
+                    set num "max"
+                }
+                if {$dowords && $worddiff eq [mc "Markup words"]} {
+                    $ctext insert end "\[-$line-\]" $tag$num
+                } else {
+                    $ctext insert end "$line" $tag$num
+                }
+                if {!$dowords} {
+                    $ctext insert end "\n" $tag$num
+                }
+            } else {
+                set tags {}
+                if {[string first "+" $prefix] >= 0} {
+                    # added line
+                    lappend tags ${tag}result
+                    if {$diffnparents > 1} {
+                        set num [string first " " $prefix]
+                        if {$num >= 0} {
+                            if {$num >= $mergemax} {
+                                set num "max"
+                            }
+                            lappend tags m$num
+                        }
+                    }
+                    set words_pre_markup "{+"
+                    set words_post_markup "+}"
+                }
+                if {$targetline ne {}} {
+                    if {$diffline == $targetline} {
+                        set diffseehere [$ctext index "end - 1 chars"]
+                        set targetline {}
+                    } else {
+                        incr diffline
+                    }
+                }
+                if {$dowords && $worddiff eq [mc "Markup words"]} {
+                    $ctext insert end "$words_pre_markup$line$words_post_markup" $tags
+                } else {
+                    $ctext insert end "$line" $tags
+                }
+                if {!$dowords} {
+                    $ctext insert end "\n" $tags
+                }
+            }
+        } elseif {$dowords && $prefix eq "~"} {
+            $ctext insert end "\n" {}
+        } else {
+            # "\ No newline at end of file",
+            # or something else we don't recognize
+            $ctext insert end "$line\n" hunksep
+        }
     }
 }
 
@@ -8361,9 +8379,9 @@
 
     set top [lindex [split $topidx .] 0]
     if {$difffilestart eq {} || $top < [lindex $difffilestart 0]} {
-	highlightfile 0
+        highlightfile 0
     } else {
-	highlightfile [expr {[bsearch $difffilestart $top] + 2}]
+        highlightfile [expr {[bsearch $difffilestart $top] + 2}]
     }
 }
 
@@ -8374,11 +8392,11 @@
     set prev 0.0
     set here [$ctext index @0,0]
     foreach loc $difffilestart {
-	if {[$ctext compare $loc >= $here]} {
-	    $ctext yview $prev
-	    return
-	}
-	set prev $loc
+        if {[$ctext compare $loc >= $here]} {
+            $ctext yview $prev
+            return
+        }
+        set prev $loc
     }
     $ctext yview $prev
 }
@@ -8389,10 +8407,10 @@
     if {$cmitmode eq "tree"} return
     set here [$ctext index @0,0]
     foreach loc $difffilestart {
-	if {[$ctext compare $loc > $here]} {
-	    $ctext yview $loc
-	    return
-	}
+        if {[$ctext compare $loc > $here]} {
+            $ctext yview $loc
+            return
+        }
     }
 }
 
@@ -8403,14 +8421,14 @@
 
     set l [lindex [split $first .] 0]
     if {![info exists smarktop] || [$ctext compare $first < $smarktop.0]} {
-	set smarktop $l
+        set smarktop $l
     }
     if {![info exists smarkbot] || [$ctext compare $first < $smarkbot.0]} {
-	set smarkbot $l
+        set smarkbot $l
     }
     $ctext delete $first end
     if {$first eq "1.0"} {
-	unset -nocomplain pendinglinks
+        unset -nocomplain pendinglinks
     }
     set ctext_file_names {}
     set ctext_file_lines {}
@@ -8420,16 +8438,16 @@
     global firsttabstop tabstop ctext have_tk85
 
     if {$firstab ne {} && $have_tk85} {
-	set firsttabstop $firstab
+        set firsttabstop $firstab
     }
     set w [font measure textfont "0"]
     if {$firsttabstop != 0} {
-	$ctext conf -tabs [list [expr {($firsttabstop + $tabstop) * $w}] \
-			       [expr {($firsttabstop + 2 * $tabstop) * $w}]]
+        $ctext conf -tabs [list [expr {($firsttabstop + $tabstop) * $w}] \
+                               [expr {($firsttabstop + 2 * $tabstop) * $w}]]
     } elseif {$have_tk85 || $tabstop != 8} {
-	$ctext conf -tabs [expr {$tabstop * $w}]
+        $ctext conf -tabs [expr {$tabstop * $w}]
     } else {
-	$ctext conf -tabs {}
+        $ctext conf -tabs {}
     }
 }
 
@@ -8437,26 +8455,26 @@
     global ctext searchstring searchdirn
 
     if {[catch {$ctext index anchor}]} {
-	# no anchor set, use start of selection, or of visible area
-	set sel [$ctext tag ranges sel]
-	if {$sel ne {}} {
-	    $ctext mark set anchor [lindex $sel 0]
-	} elseif {$searchdirn eq "-forwards"} {
-	    $ctext mark set anchor @0,0
-	} else {
-	    $ctext mark set anchor @0,[winfo height $ctext]
-	}
+        # no anchor set, use start of selection, or of visible area
+        set sel [$ctext tag ranges sel]
+        if {$sel ne {}} {
+            $ctext mark set anchor [lindex $sel 0]
+        } elseif {$searchdirn eq "-forwards"} {
+            $ctext mark set anchor @0,0
+        } else {
+            $ctext mark set anchor @0,[winfo height $ctext]
+        }
     }
     if {$searchstring ne {}} {
-	set here [$ctext search -count mlen $searchdirn -- $searchstring anchor]
-	if {$here ne {}} {
-	    $ctext see $here
-	    set mend "$here + $mlen c"
-	    $ctext tag remove sel 1.0 end
-	    $ctext tag add sel $here $mend
-	    suppress_highlighting_file_for_current_scrollpos
-	    highlightfile_for_scrollpos $here
-	}
+        set here [$ctext search -count mlen $searchdirn -- $searchstring anchor]
+        if {$here ne {}} {
+            $ctext see $here
+            set mend "$here + $mlen c"
+            $ctext tag remove sel 1.0 end
+            $ctext tag add sel $here $mend
+            suppress_highlighting_file_for_current_scrollpos
+            highlightfile_for_scrollpos $here
+        }
     }
     rehighlight_search_results
 }
@@ -8468,25 +8486,25 @@
     $sstring icursor end
     set searchdirn -forwards
     if {$searchstring ne {}} {
-	set sel [$ctext tag ranges sel]
-	if {$sel ne {}} {
-	    set start "[lindex $sel 0] + 1c"
-	} elseif {[catch {set start [$ctext index anchor]}]} {
-	    set start "@0,0"
-	}
-	set match [$ctext search -count mlen -- $searchstring $start]
-	$ctext tag remove sel 1.0 end
-	if {$match eq {}} {
-	    bell
-	    return
-	}
-	$ctext see $match
-	suppress_highlighting_file_for_current_scrollpos
-	highlightfile_for_scrollpos $match
-	set mend "$match + $mlen c"
-	$ctext tag add sel $match $mend
-	$ctext mark unset anchor
-	rehighlight_search_results
+        set sel [$ctext tag ranges sel]
+        if {$sel ne {}} {
+            set start "[lindex $sel 0] + 1c"
+        } elseif {[catch {set start [$ctext index anchor]}]} {
+            set start "@0,0"
+        }
+        set match [$ctext search -count mlen -- $searchstring $start]
+        $ctext tag remove sel 1.0 end
+        if {$match eq {}} {
+            bell
+            return
+        }
+        $ctext see $match
+        suppress_highlighting_file_for_current_scrollpos
+        highlightfile_for_scrollpos $match
+        set mend "$match + $mlen c"
+        $ctext tag add sel $match $mend
+        $ctext mark unset anchor
+        rehighlight_search_results
     }
 }
 
@@ -8497,25 +8515,25 @@
     $sstring icursor end
     set searchdirn -backwards
     if {$searchstring ne {}} {
-	set sel [$ctext tag ranges sel]
-	if {$sel ne {}} {
-	    set start [lindex $sel 0]
-	} elseif {[catch {set start [$ctext index anchor]}]} {
-	    set start @0,[winfo height $ctext]
-	}
-	set match [$ctext search -backwards -count ml -- $searchstring $start]
-	$ctext tag remove sel 1.0 end
-	if {$match eq {}} {
-	    bell
-	    return
-	}
-	$ctext see $match
-	suppress_highlighting_file_for_current_scrollpos
-	highlightfile_for_scrollpos $match
-	set mend "$match + $ml c"
-	$ctext tag add sel $match $mend
-	$ctext mark unset anchor
-	rehighlight_search_results
+        set sel [$ctext tag ranges sel]
+        if {$sel ne {}} {
+            set start [lindex $sel 0]
+        } elseif {[catch {set start [$ctext index anchor]}]} {
+            set start @0,[winfo height $ctext]
+        }
+        set match [$ctext search -backwards -count ml -- $searchstring $start]
+        $ctext tag remove sel 1.0 end
+        if {$match eq {}} {
+            bell
+            return
+        }
+        $ctext see $match
+        suppress_highlighting_file_for_current_scrollpos
+        highlightfile_for_scrollpos $match
+        set mend "$match + $ml c"
+        $ctext tag add sel $match $mend
+        $ctext mark unset anchor
+        rehighlight_search_results
     }
 }
 
@@ -8526,7 +8544,7 @@
     $ctext tag remove currentsearchhit 1.0 end
 
     if {$searchstring ne {}} {
-	searchmarkvisible 1
+        searchmarkvisible 1
     }
 }
 
@@ -8537,14 +8555,14 @@
 
     set mend $first.0
     while {1} {
-	set match [$ctext search -count mlen -- $searchstring $mend $last.end]
-	if {$match eq {}} break
-	set mend "$match + $mlen c"
-	if {$sel ne {} && [$ctext compare $match == [lindex $sel 0]]} {
-	    $ctext tag add currentsearchhit $match $mend
-	} else {
-	    $ctext tag add found $match $mend
-	}
+        set match [$ctext search -count mlen -- $searchstring $mend $last.end]
+        if {$match eq {}} break
+        set mend "$match + $mlen c"
+        if {$sel ne {} && [$ctext compare $match == [lindex $sel 0]]} {
+            $ctext tag add currentsearchhit $match $mend
+        } else {
+            $ctext tag add found $match $mend
+        }
     }
 }
 
@@ -8554,19 +8572,19 @@
     set topline [lindex [split [$ctext index @0,0] .] 0]
     set botline [lindex [split [$ctext index @0,[winfo height $ctext]] .] 0]
     if {$doall || $botline < $smarktop || $topline > $smarkbot} {
-	# no overlap with previous
-	searchmark $topline $botline
-	set smarktop $topline
-	set smarkbot $botline
+        # no overlap with previous
+        searchmark $topline $botline
+        set smarktop $topline
+        set smarkbot $botline
     } else {
-	if {$topline < $smarktop} {
-	    searchmark $topline [expr {$smarktop-1}]
-	    set smarktop $topline
-	}
-	if {$botline > $smarkbot} {
-	    searchmark [expr {$smarkbot+1}] $botline
-	    set smarkbot $botline
-	}
+        if {$topline < $smarktop} {
+            searchmark $topline [expr {$smarktop-1}]
+            set smarktop $topline
+        }
+        if {$botline > $smarkbot} {
+            searchmark [expr {$smarkbot+1}] $botline
+            set smarkbot $botline
+        }
     }
 }
 
@@ -8582,15 +8600,15 @@
 
     set topidx [$ctext index @0,0]
     if {![info exists suppress_highlighting_file_for_this_scrollpos]
-	|| $topidx ne $suppress_highlighting_file_for_this_scrollpos} {
-	highlightfile_for_scrollpos $topidx
+        || $topidx ne $suppress_highlighting_file_for_this_scrollpos} {
+        highlightfile_for_scrollpos $topidx
     }
 
     unset -nocomplain suppress_highlighting_file_for_this_scrollpos
 
     .bleft.bottom.sb set $f0 $f1
     if {$searchstring ne {}} {
-	searchmarkvisible 0
+        searchmarkvisible 0
     }
 }
 
@@ -8619,8 +8637,8 @@
     allcanvs yview moveto [lindex $span 0]
     drawvisible
     if {$selectedline ne {}} {
-	selectline $selectedline 0
-	allcanvs yview moveto [lindex $span 0]
+        selectline $selectedline 0
+        allcanvs yview moveto [lindex $span 0]
     }
 }
 
@@ -8630,20 +8648,20 @@
     set fontattr($f,family) [lindex $n 0]
     set s [lindex $n 1]
     if {$s eq {} || $s == 0} {
-	set s 10
+        set s 10
     } elseif {$s < 0} {
-	set s [expr {int(-$s / [winfo fpixels . 1p] + 0.5)}]
+        set s [expr {int(-$s / [winfo fpixels . 1p] + 0.5)}]
     }
     set fontattr($f,size) $s
     set fontattr($f,weight) normal
     set fontattr($f,slant) roman
     foreach style [lrange $n 2 end] {
-	switch -- $style {
-	    "normal" -
-	    "bold"   {set fontattr($f,weight) $style}
-	    "roman" -
-	    "italic" {set fontattr($f,slant) $style}
-	}
+        switch -- $style {
+            "normal" -
+            "bold"   {set fontattr($f,weight) $style}
+            "roman" -
+            "italic" {set fontattr($f,slant) $style}
+        }
     }
 }
 
@@ -8651,8 +8669,8 @@
     global fontattr
 
     return [list -family $fontattr($f,family) -size $fontattr($f,size) \
-		-weight [expr {$isbold? "bold": $fontattr($f,weight)}] \
-		-slant $fontattr($f,slant)]
+                -weight [expr {$isbold? "bold": $fontattr($f,weight)}] \
+                -slant $fontattr($f,slant)]
 }
 
 proc fontname {f} {
@@ -8660,10 +8678,10 @@
 
     set n [list $fontattr($f,family) $fontattr($f,size)]
     if {$fontattr($f,weight) eq "bold"} {
-	lappend n "bold"
+        lappend n "bold"
     }
     if {$fontattr($f,slant) eq "italic"} {
-	lappend n "italic"
+        lappend n "italic"
     }
     return $n
 }
@@ -8676,7 +8694,7 @@
     set s $fontattr(mainfont,size)
     incr s $inc
     if {$s < 1} {
-	set s 1
+        set s 1
     }
     set fontattr(mainfont,size) $s
     font config mainfont -size $s
@@ -8685,7 +8703,7 @@
     set s $fontattr(textfont,size)
     incr s $inc
     if {$s < 1} {
-	set s 1
+        set s 1
     }
     set fontattr(textfont,size) $s
     font config textfont -size $s
@@ -8699,23 +8717,23 @@
 proc clearsha1 {} {
     global sha1entry sha1string
     if {[string length $sha1string] == 40} {
-	$sha1entry delete 0 end
+        $sha1entry delete 0 end
     }
 }
 
 proc sha1change {n1 n2 op} {
     global sha1string currentid sha1but
     if {$sha1string == {}
-	|| ([info exists currentid] && $sha1string == $currentid)} {
-	set state disabled
+        || ([info exists currentid] && $sha1string == $currentid)} {
+        set state disabled
     } else {
-	set state normal
+        set state normal
     }
     if {[$sha1but cget -state] == $state} return
     if {$state == "normal"} {
-	$sha1but conf -state normal -relief raised -text "[mc "Goto:"] "
+        $sha1but conf -state normal -relief raised -text "[mc "Goto:"] "
     } else {
-	$sha1but conf -state disabled -relief flat -text "[mc "SHA1 ID:"] "
+        $sha1but conf -state disabled -relief flat -text "[mc "SHA1 ID:"] "
     }
 }
 
@@ -8723,37 +8741,37 @@
     global sha1string tagids headids curview varcid
 
     if {$sha1string == {}
-	|| ([info exists currentid] && $sha1string == $currentid)} return
+        || ([info exists currentid] && $sha1string == $currentid)} return
     if {[info exists tagids($sha1string)]} {
-	set id $tagids($sha1string)
+        set id $tagids($sha1string)
     } elseif {[info exists headids($sha1string)]} {
-	set id $headids($sha1string)
+        set id $headids($sha1string)
     } else {
-	set id [string tolower $sha1string]
-	if {[regexp {^[0-9a-f]{4,39}$} $id]} {
-	    set matches [longid $id]
-	    if {$matches ne {}} {
-		if {[llength $matches] > 1} {
-		    error_popup [mc "Short SHA1 id %s is ambiguous" $id]
-		    return
-		}
-		set id [lindex $matches 0]
-	    }
-	} else {
-	    if {[catch {set id [exec git rev-parse --verify $sha1string]}]} {
-		error_popup [mc "Revision %s is not known" $sha1string]
-		return
-	    }
-	}
+        set id [string tolower $sha1string]
+        if {[regexp {^[0-9a-f]{4,39}$} $id]} {
+            set matches [longid $id]
+            if {$matches ne {}} {
+                if {[llength $matches] > 1} {
+                    error_popup [mc "Short SHA1 id %s is ambiguous" $id]
+                    return
+                }
+                set id [lindex $matches 0]
+            }
+        } else {
+            if {[catch {set id [exec git rev-parse --verify $sha1string]}]} {
+                error_popup [mc "Revision %s is not known" $sha1string]
+                return
+            }
+        }
     }
     if {[commitinview $id $curview]} {
-	selectline [rowofcommit $id] 1
-	return
+        selectline [rowofcommit $id] 1
+        return
     }
     if {[regexp {^[0-9a-fA-F]{4,}$} $sha1string]} {
-	set msg [mc "SHA1 id %s is not known" $sha1string]
+        set msg [mc "SHA1 id %s is not known" $sha1string]
     } else {
-	set msg [mc "Revision %s is not in the current view" $sha1string]
+        set msg [mc "Revision %s is not in the current view" $sha1string]
     }
     error_popup $msg
 }
@@ -8767,7 +8785,7 @@
     set hovery $y
     set hoverid $id
     if {[info exists hovertimer]} {
-	after cancel $hovertimer
+        after cancel $hovertimer
     }
     set hovertimer [after 500 linehover]
     $canv delete hover
@@ -8777,12 +8795,12 @@
     global hoverx hovery hoverid hovertimer
 
     if {[info exists hoverid] && $id == $hoverid} {
-	set hoverx $x
-	set hovery $y
-	if {[info exists hovertimer]} {
-	    after cancel $hovertimer
-	}
-	set hovertimer [after 500 linehover]
+        set hoverx $x
+        set hovery $y
+        if {[info exists hovertimer]} {
+            after cancel $hovertimer
+        }
+        set hovertimer [after 500 linehover]
     }
 }
 
@@ -8790,12 +8808,12 @@
     global hoverid hovertimer canv
 
     if {[info exists hoverid] && $id == $hoverid} {
-	$canv delete hover
-	if {[info exists hovertimer]} {
-	    after cancel $hovertimer
-	    unset hovertimer
-	}
-	unset hoverid
+        $canv delete hover
+        if {[info exists hovertimer]} {
+            after cancel $hovertimer
+            unset hovertimer
+        }
+        unset hoverid
     }
 }
 
@@ -8817,11 +8835,11 @@
     set x1 [expr {$x + [font measure mainfont $text] + 2 * $lthickness}]
     set y1 [expr {$y + $linespc + 2 * $lthickness}]
     set t [$canv create rectangle $x0 $y0 $x1 $y1 \
-	       -fill $linehoverbgcolor -outline $linehoveroutlinecolor \
-	       -width 1 -tags hover]
+               -fill $linehoverbgcolor -outline $linehoveroutlinecolor \
+               -width 1 -tags hover]
     $canv raise $t
     set t [$canv create text $x $y -anchor nw -text $text -tags hover \
-	       -font mainfont -fill $linehoverfgcolor]
+               -font mainfont -fill $linehoverfgcolor]
     $canv raise $t
 }
 
@@ -8832,10 +8850,10 @@
     set thresh [expr {2 * $lthickness + 6}]
     set n [expr {[llength $ranges] - 1}]
     for {set i 1} {$i < $n} {incr i} {
-	set row [lindex $ranges $i]
-	if {abs([yc $row] - $y) < $thresh} {
-	    return $i
-	}
+        set row [lindex $ranges $i]
+        if {abs([yc $row] - $y) < $thresh} {
+            return $i
+        }
     }
     return {}
 }
@@ -8853,7 +8871,7 @@
     set yspan [expr {[lindex $view 1] - [lindex $view 0]}]
     set yfrac [expr {$yt / $ymax - $yspan / 2}]
     if {$yfrac < 0} {
-	set yfrac 0
+        set yfrac 0
     }
     allcanvs yview moveto $yfrac
 }
@@ -8870,19 +8888,19 @@
     set thickerline $id
     drawlines $id
     if {$isnew} {
-	set ymax [lindex [$canv cget -scrollregion] 3]
-	if {$ymax eq {}} return
-	set yfrac [lindex [$canv yview] 0]
-	set y [expr {$y + $yfrac * $ymax}]
+        set ymax [lindex [$canv cget -scrollregion] 3]
+        if {$ymax eq {}} return
+        set yfrac [lindex [$canv yview] 0]
+        set y [expr {$y + $yfrac * $ymax}]
     }
     set dirn [clickisonarrow $id $y]
     if {$dirn ne {}} {
-	arrowjump $id $dirn $y
-	return
+        arrowjump $id $dirn $y
+        return
     }
 
     if {$isnew} {
-	addtohistory [list lineclick $x $y $id 0] savectextpos
+        addtohistory [list lineclick $x $y $id 0] savectextpos
     }
     # fill the details pane with info about this line
     $ctext conf -state normal
@@ -8898,20 +8916,20 @@
     $ctext insert end "\t[mc "Date"]:\t$date\n"
     set kids $children($curview,$id)
     if {$kids ne {}} {
-	$ctext insert end "\n[mc "Children"]:"
-	set i 0
-	foreach child $kids {
-	    incr i
-	    if {![info exists commitinfo($child)] && ![getcommit $child]} continue
-	    set info $commitinfo($child)
-	    $ctext insert end "\n\t"
-	    $ctext insert end $child link$i
-	    setlink $child link$i
-	    $ctext insert end "\n\t[lindex $info 0]"
-	    $ctext insert end "\n\t[mc "Author"]:\t[lindex $info 1]"
-	    set date [formatdate [lindex $info 2]]
-	    $ctext insert end "\n\t[mc "Date"]:\t$date\n"
-	}
+        $ctext insert end "\n[mc "Children"]:"
+        set i 0
+        foreach child $kids {
+            incr i
+            if {![info exists commitinfo($child)] && ![getcommit $child]} continue
+            set info $commitinfo($child)
+            $ctext insert end "\n\t"
+            $ctext insert end $child link$i
+            setlink $child link$i
+            $ctext insert end "\n\t[lindex $info 0]"
+            $ctext insert end "\n\t[mc "Author"]:\t[lindex $info 1]"
+            set date [formatdate [lindex $info 2]]
+            $ctext insert end "\n\t[mc "Date"]:\t$date\n"
+        }
     }
     maybe_scroll_ctext 1
     $ctext conf -state disabled
@@ -8921,23 +8939,23 @@
 proc normalline {} {
     global thickerline
     if {[info exists thickerline]} {
-	set id $thickerline
-	unset thickerline
-	drawlines $id
+        set id $thickerline
+        unset thickerline
+        drawlines $id
     }
 }
 
 proc selbyid {id {isnew 1}} {
     global curview
     if {[commitinview $id $curview]} {
-	selectline [rowofcommit $id] $isnew
+        selectline [rowofcommit $id] $isnew
     }
 }
 
 proc mstime {} {
     global startmstime
     if {![info exists startmstime]} {
-	set startmstime [clock clicks -milliseconds]
+        set startmstime [clock clicks -milliseconds]
     }
     return [format "%.3f" [expr {([clock click -milliseconds] - $startmstime) / 1000.0}]]
 }
@@ -8949,27 +8967,27 @@
     stopfinding
     set rowmenuid $id
     if {$selectedline eq {} || [rowofcommit $id] eq $selectedline} {
-	set state disabled
+        set state disabled
     } else {
-	set state normal
+        set state normal
     }
     if {[info exists markedid] && $markedid ne $id} {
-	set mstate normal
+        set mstate normal
     } else {
-	set mstate disabled
+        set mstate disabled
     }
     if {$id ne $nullid && $id ne $nullid2} {
-	set menu $rowctxmenu
-	if {$mainhead ne {}} {
-	    $menu entryconfigure 8 -label [mc "Reset %s branch to here" $mainhead] -state normal
-	} else {
-	    $menu entryconfigure 8 -label [mc "Detached head: can't reset" $mainhead] -state disabled
-	}
-	$menu entryconfigure 10 -state $mstate
-	$menu entryconfigure 11 -state $mstate
-	$menu entryconfigure 12 -state $mstate
+        set menu $rowctxmenu
+        if {$mainhead ne {}} {
+            $menu entryconfigure 8 -label [mc "Reset %s branch to here" $mainhead] -state normal
+        } else {
+            $menu entryconfigure 8 -label [mc "Detached head: can't reset" $mainhead] -state disabled
+        }
+        $menu entryconfigure 10 -state $mstate
+        $menu entryconfigure 11 -state $mstate
+        $menu entryconfigure 12 -state $mstate
     } else {
-	set menu $fakerowmenu
+        set menu $fakerowmenu
     }
     $menu entryconfigure [mca "Diff this -> selected"] -state $state
     $menu entryconfigure [mca "Diff selected -> this"] -state $state
@@ -8990,7 +9008,7 @@
     global markedid
 
     if {[info exists markedid]} {
-	selbyid $markedid
+        selbyid $markedid
     }
 }
 
@@ -9000,7 +9018,7 @@
     set id [commitonrow $r]
     set l [lreplace $l 0 0]
     foreach kid $children($curview,$id) {
-	lappend l [rowofcommit $kid]
+        lappend l [rowofcommit $kid]
     }
     return [lsort -integer -decreasing -unique $l]
 }
@@ -9010,23 +9028,23 @@
 
     if {![info exists markedid]} return
     if {![commitinview $markedid $curview] ||
-	![commitinview $rowmenuid $curview]} return
+        ![commitinview $rowmenuid $curview]} return
     #set t1 [clock clicks -milliseconds]
     set l1 [list [rowofcommit $markedid]]
     set l2 [list [rowofcommit $rowmenuid]]
     while 1 {
-	set r1 [lindex $l1 0]
-	set r2 [lindex $l2 0]
-	if {$r1 eq {} || $r2 eq {}} break
-	if {$r1 == $r2} {
-	    selectline $r1 1
-	    break
-	}
-	if {$r1 > $r2} {
-	    set l1 [replace_by_kids $l1 $r1]
-	} else {
-	    set l2 [replace_by_kids $l2 $r2]
-	}
+        set r1 [lindex $l1 0]
+        set r2 [lindex $l2 0]
+        if {$r1 eq {} || $r2 eq {}} break
+        if {$r1 == $r2} {
+            selectline $r1 1
+            break
+        }
+        if {$r1 > $r2} {
+            set l1 [replace_by_kids $l1 $r1]
+        } else {
+            set l2 [replace_by_kids $l2 $r2]
+        }
     }
     #set t2 [clock clicks -milliseconds]
     #puts "took [expr {$t2-$t1}]ms"
@@ -9045,15 +9063,15 @@
     global patchids
 
     if {![info exists patchids($id)]} {
-	set cmd [diffcmd [list $id] {-p --root}]
-	# trim off the initial "|"
-	set cmd [lrange $cmd 1 end]
-	if {[catch {
-	    set x [eval exec $cmd | git patch-id]
-	    set patchids($id) [lindex $x 0]
-	}]} {
-	    set patchids($id) "error"
-	}
+        set cmd [diffcmd [list $id] {-p --root}]
+        # trim off the initial "|"
+        set cmd [lrange $cmd 1 end]
+        if {[catch {
+            set x [eval exec $cmd | git patch-id]
+            set patchids($id) [lindex $x 0]
+        }]} {
+            set patchids($id) "error"
+        }
     }
     return $patchids($id)
 }
@@ -9065,75 +9083,75 @@
     clear_ctext
     init_flist {}
     for {set i 0} {$i < 100} {incr i} {
-	set skipa 0
-	set skipb 0
-	if {[llength $parents($curview,$a)] > 1} {
-	    appendshortlink $a [mc "Skipping merge commit "] "\n"
-	    set skipa 1
-	} else {
-	    set patcha [getpatchid $a]
-	}
-	if {[llength $parents($curview,$b)] > 1} {
-	    appendshortlink $b [mc "Skipping merge commit "] "\n"
-	    set skipb 1
-	} else {
-	    set patchb [getpatchid $b]
-	}
-	if {!$skipa && !$skipb} {
-	    set heada [lindex $commitinfo($a) 0]
-	    set headb [lindex $commitinfo($b) 0]
-	    if {$patcha eq "error"} {
-		appendshortlink $a [mc "Error getting patch ID for "] \
-		    [mc " - stopping\n"]
-		break
-	    }
-	    if {$patchb eq "error"} {
-		appendshortlink $b [mc "Error getting patch ID for "] \
-		    [mc " - stopping\n"]
-		break
-	    }
-	    if {$patcha eq $patchb} {
-		if {$heada eq $headb} {
-		    appendshortlink $a [mc "Commit "]
-		    appendshortlink $b " == " "  $heada\n"
-		} else {
-		    appendshortlink $a [mc "Commit "] "  $heada\n"
-		    appendshortlink $b [mc " is the same patch as\n       "] \
-			"  $headb\n"
-		}
-		set skipa 1
-		set skipb 1
-	    } else {
-		$ctext insert end "\n"
-		appendshortlink $a [mc "Commit "] "  $heada\n"
-		appendshortlink $b [mc " differs from\n       "] \
-		    "  $headb\n"
-		$ctext insert end [mc "Diff of commits:\n\n"]
-		$ctext conf -state disabled
-		update
-		diffcommits $a $b
-		return
-	    }
-	}
-	if {$skipa} {
-	    set kids [real_children $curview,$a]
-	    if {[llength $kids] != 1} {
-		$ctext insert end "\n"
-		appendshortlink $a [mc "Commit "] \
-		    [mc " has %s children - stopping\n" [llength $kids]]
-		break
-	    }
-	    set a [lindex $kids 0]
-	}
-	if {$skipb} {
-	    set kids [real_children $curview,$b]
-	    if {[llength $kids] != 1} {
-		appendshortlink $b [mc "Commit "] \
-		    [mc " has %s children - stopping\n" [llength $kids]]
-		break
-	    }
-	    set b [lindex $kids 0]
-	}
+        set skipa 0
+        set skipb 0
+        if {[llength $parents($curview,$a)] > 1} {
+            appendshortlink $a [mc "Skipping merge commit "] "\n"
+            set skipa 1
+        } else {
+            set patcha [getpatchid $a]
+        }
+        if {[llength $parents($curview,$b)] > 1} {
+            appendshortlink $b [mc "Skipping merge commit "] "\n"
+            set skipb 1
+        } else {
+            set patchb [getpatchid $b]
+        }
+        if {!$skipa && !$skipb} {
+            set heada [lindex $commitinfo($a) 0]
+            set headb [lindex $commitinfo($b) 0]
+            if {$patcha eq "error"} {
+                appendshortlink $a [mc "Error getting patch ID for "] \
+                    [mc " - stopping\n"]
+                break
+            }
+            if {$patchb eq "error"} {
+                appendshortlink $b [mc "Error getting patch ID for "] \
+                    [mc " - stopping\n"]
+                break
+            }
+            if {$patcha eq $patchb} {
+                if {$heada eq $headb} {
+                    appendshortlink $a [mc "Commit "]
+                    appendshortlink $b " == " "  $heada\n"
+                } else {
+                    appendshortlink $a [mc "Commit "] "  $heada\n"
+                    appendshortlink $b [mc " is the same patch as\n       "] \
+                        "  $headb\n"
+                }
+                set skipa 1
+                set skipb 1
+            } else {
+                $ctext insert end "\n"
+                appendshortlink $a [mc "Commit "] "  $heada\n"
+                appendshortlink $b [mc " differs from\n       "] \
+                    "  $headb\n"
+                $ctext insert end [mc "Diff of commits:\n\n"]
+                $ctext conf -state disabled
+                update
+                diffcommits $a $b
+                return
+            }
+        }
+        if {$skipa} {
+            set kids [real_children $curview,$a]
+            if {[llength $kids] != 1} {
+                $ctext insert end "\n"
+                appendshortlink $a [mc "Commit "] \
+                    [mc " has %s children - stopping\n" [llength $kids]]
+                break
+            }
+            set a [lindex $kids 0]
+        }
+        if {$skipb} {
+            set kids [real_children $curview,$b]
+            if {[llength $kids] != 1} {
+                appendshortlink $b [mc "Commit "] \
+                    [mc " has %s children - stopping\n" [llength $kids]]
+                break
+            }
+            set b [lindex $kids 0]
+        }
     }
     $ctext conf -state disabled
 }
@@ -9145,17 +9163,17 @@
     set fna [file join $tmpdir "commit-[string range $a 0 7]"]
     set fnb [file join $tmpdir "commit-[string range $b 0 7]"]
     if {[catch {
-	exec git diff-tree -p --pretty $a >$fna
-	exec git diff-tree -p --pretty $b >$fnb
+        exec git diff-tree -p --pretty $a >$fna
+        exec git diff-tree -p --pretty $b >$fnb
     } err]} {
-	error_popup [mc "Error writing commit to file: %s" $err]
-	return
+        error_popup [mc "Error writing commit to file: %s" $err]
+        return
     }
     if {[catch {
-	set fd [open "| diff -U$diffcontext $fna $fnb" r]
+        set fd [open "| diff -U$diffcontext $fna $fnb" r]
     } err]} {
-	error_popup [mc "Error diffing commits: %s" $err]
-	return
+        error_popup [mc "Error diffing commits: %s" $err]
+        return
     }
     set diffids [list commits $a $b]
     set blobdifffd($diffids) $fd
@@ -9169,11 +9187,11 @@
 
     if {$selectedline eq {}} return
     if {$dirn} {
-	set oldid [commitonrow $selectedline]
-	set newid $rowmenuid
+        set oldid [commitonrow $selectedline]
+        set newid $rowmenuid
     } else {
-	set oldid $rowmenuid
-	set newid [commitonrow $selectedline]
+        set oldid $rowmenuid
+        set newid [commitonrow $selectedline]
     }
     addtohistory [list doseldiff $oldid $newid] savectextpos
     doseldiff $oldid $newid
@@ -9184,11 +9202,11 @@
 
     if {![info exists markedid]} return
     if {$dirn} {
-	set oldid $markedid
-	set newid $rowmenuid
+        set oldid $markedid
+        set newid $rowmenuid
     } else {
-	set oldid $rowmenuid
-	set newid $markedid
+        set oldid $rowmenuid
+        set newid $markedid
     }
     addtohistory [list doseldiff $oldid $newid] savectextpos
     doseldiff $oldid $newid
@@ -9277,11 +9295,11 @@
     set newid [$patchtop.tosha1 get]
     set newhead [$patchtop.tohead get]
     foreach e [list fromsha1 fromhead tosha1 tohead] \
-	    v [list $newid $newhead $oldid $oldhead] {
-	$patchtop.$e conf -state normal
-	$patchtop.$e delete 0 end
-	$patchtop.$e insert 0 $v
-	$patchtop.$e conf -state readonly
+            v [list $newid $newhead $oldid $oldhead] {
+        $patchtop.$e conf -state normal
+        $patchtop.$e delete 0 end
+        $patchtop.$e insert 0 $v
+        $patchtop.$e conf -state readonly
     }
 }
 
@@ -9296,7 +9314,7 @@
     set cmd [lrange $cmd 1 end]
     lappend cmd >$fname &
     if {[catch {eval exec $cmd} err]} {
-	error_popup "[mc "Error creating patch:"] $err" $patchtop
+        error_popup "[mc "Error creating patch:"] $err" $patchtop
     }
     catch {destroy $patchtop}
     unset patchtop
@@ -9355,22 +9373,22 @@
     set tag [$mktagtop.tag get]
     set msg [$mktagtop.msg get]
     if {$tag == {}} {
-	error_popup [mc "No tag name specified"] $mktagtop
-	return 0
+        error_popup [mc "No tag name specified"] $mktagtop
+        return 0
     }
     if {[info exists tagids($tag)]} {
-	error_popup [mc "Tag \"%s\" already exists" $tag] $mktagtop
-	return 0
+        error_popup [mc "Tag \"%s\" already exists" $tag] $mktagtop
+        return 0
     }
     if {[catch {
-	if {$msg != {}} {
-	    exec git tag -a -m $msg $tag $id
-	} else {
-	    exec git tag $tag $id
-	}
+        if {$msg != {}} {
+            exec git tag -a -m $msg $tag $id
+        } else {
+            exec git tag $tag $id
+        }
     } err]} {
-	error_popup "[mc "Error creating tag:"] $err" $mktagtop
-	return 0
+        error_popup "[mc "Error creating tag:"] $err" $mktagtop
+        return 0
     }
 
     set tagids($tag) $id
@@ -9391,9 +9409,9 @@
     if {![info exists iddrawn($id)]} return
     set row [rowofcommit $id]
     if {$id eq $mainheadid} {
-	set ofill $mainheadcirclecolor
+        set ofill $mainheadcirclecolor
     } else {
-	set ofill [lindex $circlecolors $cmitlisted($curview,$id)]
+        set ofill [lindex $circlecolors $cmitlisted($curview,$id)]
     }
     $canv itemconf $circleitem($row) -fill $ofill
     $canv delete tag.$id
@@ -9403,14 +9421,14 @@
     set font [$canv itemcget $linehtag($id) -font]
     set xr [expr {$xt + [font measure $font $text]}]
     if {$xr > $canvxmax} {
-	set canvxmax $xr
-	setcanvscroll
+        set canvxmax $xr
+        setcanvscroll
     }
     if {[info exists currentid] && $currentid == $id} {
-	make_secsel $id
+        make_secsel $id
     }
     if {[info exists markedid] && $markedid eq $id} {
-	make_idmark $id
+        make_idmark $id
     }
 }
 
@@ -9426,7 +9444,7 @@
     mktagcan
 }
 
-proc copysummary {} {
+proc copyreference {} {
     global rowmenuid autosellen
 
     set format "%h (\"%s\", %ad)"
@@ -9434,10 +9452,10 @@
     if {$autosellen < 40} {
         lappend cmd --abbrev=$autosellen
     }
-    set summary [eval exec $cmd $rowmenuid]
+    set reference [eval exec $cmd $rowmenuid]
 
     clipboard clear
-    clipboard append $summary
+    clipboard append $reference
 }
 
 proc writecommit {} {
@@ -9485,7 +9503,7 @@
     set cmd "echo $id | [$wrcomtop.cmd get]"
     set fname [$wrcomtop.fname get]
     if {[catch {exec sh -c $cmd >$fname &} err]} {
-	error_popup "[mc "Error writing commit:"] $err" $wrcomtop
+        error_popup "[mc "Error writing commit:"] $err" $wrcomtop
     }
     catch {destroy $wrcomtop}
     unset wrcomtop
@@ -9572,41 +9590,41 @@
     set cmdargs {}
     set old_id {}
     if {$name eq {}} {
-	error_popup [mc "Please specify a name for the new branch"] $top
-	return
+        error_popup [mc "Please specify a name for the new branch"] $top
+        return
     }
     if {[info exists headids($name)]} {
-	if {![confirm_popup [mc \
-		"Branch '%s' already exists. Overwrite?" $name] $top]} {
-	    return
-	}
-	set old_id $headids($name)
-	lappend cmdargs -f
+        if {![confirm_popup [mc \
+                "Branch '%s' already exists. Overwrite?" $name] $top]} {
+            return
+        }
+        set old_id $headids($name)
+        lappend cmdargs -f
     }
     catch {destroy $top}
     lappend cmdargs $name $id
     nowbusy newbranch
     update
     if {[catch {
-	eval exec git branch $cmdargs
+        eval exec git branch $cmdargs
     } err]} {
-	notbusy newbranch
-	error_popup $err
+        notbusy newbranch
+        error_popup $err
     } else {
-	notbusy newbranch
-	if {$old_id ne {}} {
-	    movehead $id $name
-	    movedhead $id $name
-	    redrawtags $old_id
-	    redrawtags $id
-	} else {
-	    set headids($name) $id
-	    lappend idheads($id) $name
-	    addedhead $id $name
-	    redrawtags $id
-	}
-	dispneartags 0
-	run refill_reflist
+        notbusy newbranch
+        if {$old_id ne {}} {
+            movehead $id $name
+            movedhead $id $name
+            redrawtags $old_id
+            redrawtags $id
+        } else {
+            set headids($name) $id
+            lappend idheads($id) $name
+            addedhead $id $name
+            redrawtags $id
+        }
+        dispneartags 0
+        run refill_reflist
     }
 }
 
@@ -9617,36 +9635,36 @@
     set id [$top.sha1 get]
     set cmdargs {}
     if {$name eq $prevname} {
-	catch {destroy $top}
-	return
+        catch {destroy $top}
+        return
     }
     if {$name eq {}} {
-	error_popup [mc "Please specify a new name for the branch"] $top
-	return
+        error_popup [mc "Please specify a new name for the branch"] $top
+        return
     }
     catch {destroy $top}
     lappend cmdargs -m $prevname $name
     nowbusy renamebranch
     update
     if {[catch {
-	eval exec git branch $cmdargs
+        eval exec git branch $cmdargs
     } err]} {
-	notbusy renamebranch
-	error_popup $err
+        notbusy renamebranch
+        error_popup $err
     } else {
-	notbusy renamebranch
-	removehead $id $prevname
-	removedhead $id $prevname
-	set headids($name) $id
-	lappend idheads($id) $name
-	addedhead $id $name
-	if {$prevname eq $mainhead} {
-	    set mainhead $name
-	    set mainheadid $id
-	}
-	redrawtags $id
-	dispneartags 0
-	run refill_reflist
+        notbusy renamebranch
+        removehead $id $prevname
+        removedhead $id $prevname
+        set headids($name) $id
+        lappend idheads($id) $name
+        addedhead $id $name
+        if {$prevname eq $mainhead} {
+            set mainhead $name
+            set mainheadid $id
+        }
+        redrawtags $id
+        dispneartags 0
+        run refill_reflist
     }
 }
 
@@ -9656,18 +9674,18 @@
     set save_env [array get env GIT_AUTHOR_*]
 
     if {$baseid ne {}} {
-	if {![info exists commitinfo($baseid)]} {
-	    getcommit $baseid
-	}
-	set author [lindex $commitinfo($baseid) 1]
-	set date [lindex $commitinfo($baseid) 2]
-	if {[regexp {^\s*(\S.*\S|\S)\s*<(.*)>\s*$} \
-	            $author author name email]
-	    && $date ne {}} {
-	    set env(GIT_AUTHOR_NAME) $name
-	    set env(GIT_AUTHOR_EMAIL) $email
-	    set env(GIT_AUTHOR_DATE) $date
-	}
+        if {![info exists commitinfo($baseid)]} {
+            getcommit $baseid
+        }
+        set author [lindex $commitinfo($baseid) 1]
+        set date [lindex $commitinfo($baseid) 2]
+        if {[regexp {^\s*(\S.*\S|\S)\s*<(.*)>\s*$} \
+                    $author author name email]
+            && $date ne {}} {
+            set env(GIT_AUTHOR_NAME) $name
+            set env(GIT_AUTHOR_EMAIL) $email
+            set env(GIT_AUTHOR_DATE) $date
+        }
     }
 
     eval exec git citool $tool_args &
@@ -9684,57 +9702,57 @@
     set oldhead [exec git rev-parse HEAD]
     set dheads [descheads $rowmenuid]
     if {$dheads ne {} && [lsearch -exact $dheads $oldhead] >= 0} {
-	set ok [confirm_popup [mc "Commit %s is already\
-		included in branch %s -- really re-apply it?" \
-				   [string range $rowmenuid 0 7] $mainhead]]
-	if {!$ok} return
+        set ok [confirm_popup [mc "Commit %s is already\
+                included in branch %s -- really re-apply it?" \
+                                   [string range $rowmenuid 0 7] $mainhead]]
+        if {!$ok} return
     }
     nowbusy cherrypick [mc "Cherry-picking"]
     update
     # Unfortunately git-cherry-pick writes stuff to stderr even when
     # no error occurs, and exec takes that as an indication of error...
     if {[catch {exec sh -c "git cherry-pick -r $rowmenuid 2>&1"} err]} {
-	notbusy cherrypick
-	if {[regexp -line \
-		 {Entry '(.*)' (would be overwritten by merge|not uptodate)} \
-		 $err msg fname]} {
-	    error_popup [mc "Cherry-pick failed because of local changes\
-			to file '%s'.\nPlease commit, reset or stash\
-			your changes and try again." $fname]
-	} elseif {[regexp -line \
-		       {^(CONFLICT \(.*\):|Automatic cherry-pick failed|error: could not apply)} \
-		       $err]} {
-	    if {[confirm_popup [mc "Cherry-pick failed because of merge\
-			conflict.\nDo you wish to run git citool to\
-			resolve it?"]]} {
-		# Force citool to read MERGE_MSG
-		file delete [file join $gitdir "GITGUI_MSG"]
-		exec_citool {} $rowmenuid
-	    }
-	} else {
-	    error_popup $err
-	}
-	run updatecommits
-	return
+        notbusy cherrypick
+        if {[regexp -line \
+                 {Entry '(.*)' (would be overwritten by merge|not uptodate)} \
+                 $err msg fname]} {
+            error_popup [mc "Cherry-pick failed because of local changes\
+                        to file '%s'.\nPlease commit, reset or stash\
+                        your changes and try again." $fname]
+        } elseif {[regexp -line \
+                       {^(CONFLICT \(.*\):|Automatic cherry-pick failed|error: could not apply)} \
+                       $err]} {
+            if {[confirm_popup [mc "Cherry-pick failed because of merge\
+                        conflict.\nDo you wish to run git citool to\
+                        resolve it?"]]} {
+                # Force citool to read MERGE_MSG
+                file delete [file join $gitdir "GITGUI_MSG"]
+                exec_citool {} $rowmenuid
+            }
+        } else {
+            error_popup $err
+        }
+        run updatecommits
+        return
     }
     set newhead [exec git rev-parse HEAD]
     if {$newhead eq $oldhead} {
-	notbusy cherrypick
-	error_popup [mc "No changes committed"]
-	return
+        notbusy cherrypick
+        error_popup [mc "No changes committed"]
+        return
     }
     addnewchild $newhead $oldhead
     if {[commitinview $oldhead $curview]} {
-	# XXX this isn't right if we have a path limit...
-	insertrow $newhead $oldhead $curview
-	if {$mainhead ne {}} {
-	    movehead $newhead $mainhead
-	    movedhead $newhead $mainhead
-	}
-	set mainheadid $newhead
-	redrawtags $oldhead
-	redrawtags $newhead
-	selbyid $newhead
+        # XXX this isn't right if we have a path limit...
+        insertrow $newhead $oldhead $curview
+        if {$mainhead ne {}} {
+            movehead $newhead $mainhead
+            movedhead $newhead $mainhead
+        }
+        set mainheadid $newhead
+        redrawtags $oldhead
+        redrawtags $newhead
+        selbyid $newhead
     }
     notbusy cherrypick
 }
@@ -9809,18 +9827,18 @@
     make_transient $w .
     wm title $w [mc "Confirm reset"]
     ${NS}::label $w.m -text \
-	[mc "Reset branch %s to %s?" $mainhead [string range $rowmenuid 0 7]]
+        [mc "Reset branch %s to %s?" $mainhead [string range $rowmenuid 0 7]]
     pack $w.m -side top -fill x -padx 20 -pady 20
     ${NS}::labelframe $w.f -text [mc "Reset type:"]
     set resettype mixed
     ${NS}::radiobutton $w.f.soft -value soft -variable resettype \
-	-text [mc "Soft: Leave working tree and index untouched"]
+        -text [mc "Soft: Leave working tree and index untouched"]
     grid $w.f.soft -sticky w
     ${NS}::radiobutton $w.f.mixed -value mixed -variable resettype \
-	-text [mc "Mixed: Leave working tree untouched, reset index"]
+        -text [mc "Mixed: Leave working tree untouched, reset index"]
     grid $w.f.mixed -sticky w
     ${NS}::radiobutton $w.f.hard -value hard -variable resettype \
-	-text [mc "Hard: Reset working tree and index\n(discard ALL local changes)"]
+        -text [mc "Hard: Reset working tree and index\n(discard ALL local changes)"]
     grid $w.f.hard -sticky w
     pack $w.f -side top -fill x -padx 4
     ${NS}::button $w.ok -text [mc OK] -command "set confirm_ok 1; destroy $w"
@@ -9832,13 +9850,13 @@
     tkwait window $w
     if {!$confirm_ok} return
     if {[catch {set fd [open \
-	    [list | git reset --$resettype $rowmenuid 2>@1] r]} err]} {
-	error_popup $err
+            [list | git reset --$resettype $rowmenuid 2>@1] r]} err]} {
+        error_popup $err
     } else {
-	dohidelocalchanges
-	filerun $fd [list readresetstat $fd]
-	nowbusy reset [mc "Resetting"]
-	selbyid $rowmenuid
+        dohidelocalchanges
+        filerun $fd [list readresetstat $fd]
+        nowbusy reset [mc "Resetting"]
+        selbyid $rowmenuid
     }
 }
 
@@ -9846,29 +9864,29 @@
     global mainhead mainheadid showlocalchanges rprogcoord
 
     if {[gets $fd line] >= 0} {
-	if {[regexp {([0-9]+)% \(([0-9]+)/([0-9]+)\)} $line match p m n]} {
-	    set rprogcoord [expr {1.0 * $m / $n}]
-	    adjustprogress
-	}
-	return 1
+        if {[regexp {([0-9]+)% \(([0-9]+)/([0-9]+)\)} $line match p m n]} {
+            set rprogcoord [expr {1.0 * $m / $n}]
+            adjustprogress
+        }
+        return 1
     }
     set rprogcoord 0
     adjustprogress
     notbusy reset
     if {[catch {close $fd} err]} {
-	error_popup $err
+        error_popup $err
     }
     set oldhead $mainheadid
     set newhead [exec git rev-parse HEAD]
     if {$newhead ne $oldhead} {
-	movehead $newhead $mainhead
-	movedhead $newhead $mainhead
-	set mainheadid $newhead
-	redrawtags $oldhead
-	redrawtags $newhead
+        movehead $newhead $mainhead
+        movedhead $newhead $mainhead
+        set mainheadid $newhead
+        redrawtags $oldhead
+        redrawtags $newhead
     }
     if {$showlocalchanges} {
-	doshowlocalchanges
+        doshowlocalchanges
     }
     return 0
 }
@@ -9882,17 +9900,17 @@
     set headmenuhead $head
     array set state {0 normal 1 normal 2 normal}
     if {[string match "remotes/*" $head]} {
-	set localhead [string range $head [expr [string last / $head] + 1] end]
-	if {[info exists headids($localhead)]} {
-	    set state(0) disabled
-	}
-	array set state {1 disabled 2 disabled}
+        set localhead [string range $head [expr [string last / $head] + 1] end]
+        if {[info exists headids($localhead)]} {
+            set state(0) disabled
+        }
+        array set state {1 disabled 2 disabled}
     }
     if {$head eq $mainhead} {
-	array set state {0 disabled 2 disabled}
+        array set state {0 disabled 2 disabled}
     }
     foreach i {0 1 2} {
-	$headctxmenu entryconfigure $i -state $state($i)
+        $headctxmenu entryconfigure $i -state $state($i)
     }
     tk_popup $headctxmenu $x $y
 }
@@ -9905,32 +9923,32 @@
     set newhead $headmenuhead
     set command [list | git checkout]
     if {[string match "remotes/*" $newhead]} {
-	set remote $newhead
-	set newhead [string range $newhead [expr [string last / $newhead] + 1] end]
-	# The following check is redundant - the menu option should
-	# be disabled to begin with...
-	if {[info exists headids($newhead)]} {
-	    error_popup [mc "A local branch named %s exists already" $newhead]
-	    return
-	}
-	lappend command -b $newhead --track $remote
+        set remote $newhead
+        set newhead [string range $newhead [expr [string last / $newhead] + 1] end]
+        # The following check is redundant - the menu option should
+        # be disabled to begin with...
+        if {[info exists headids($newhead)]} {
+            error_popup [mc "A local branch named %s exists already" $newhead]
+            return
+        }
+        lappend command -b $newhead --track $remote
     } else {
-	lappend command $newhead
+        lappend command $newhead
     }
     lappend command 2>@1
     nowbusy checkout [mc "Checking out"]
     update
     dohidelocalchanges
     if {[catch {
-	set fd [open $command r]
+        set fd [open $command r]
     } err]} {
-	notbusy checkout
-	error_popup $err
-	if {$showlocalchanges} {
-	    dodiffindex
-	}
+        notbusy checkout
+        error_popup $err
+        if {$showlocalchanges} {
+            dodiffindex
+        }
     } else {
-	filerun $fd [list readcheckoutstat $fd $newhead $headmenuid]
+        filerun $fd [list readcheckoutstat $fd $newhead $headmenuid]
     }
 }
 
@@ -9939,24 +9957,24 @@
     global viewmainheadid curview
 
     if {[gets $fd line] >= 0} {
-	if {[regexp {([0-9]+)% \(([0-9]+)/([0-9]+)\)} $line match p m n]} {
-	    set progresscoords [list 0 [expr {1.0 * $m / $n}]]
-	    adjustprogress
-	}
-	return 1
+        if {[regexp {([0-9]+)% \(([0-9]+)/([0-9]+)\)} $line match p m n]} {
+            set progresscoords [list 0 [expr {1.0 * $m / $n}]]
+            adjustprogress
+        }
+        return 1
     }
     set progresscoords {0 0}
     adjustprogress
     notbusy checkout
     if {[catch {close $fd} err]} {
-	error_popup $err
-	return
+        error_popup $err
+        return
     }
     set oldmainid $mainheadid
     if {! [info exists headids($newhead)]} {
-	set headids($newhead) $newheadid
-	lappend idheads($newheadid) $newhead
-	addedhead $newheadid $newhead
+        set headids($newhead) $newheadid
+        lappend idheads($newheadid) $newhead
+        addedhead $newheadid $newhead
     }
     set mainhead $newhead
     set mainheadid $newheadid
@@ -9965,7 +9983,7 @@
     redrawtags $newheadid
     selbyid $newheadid
     if {$showlocalchanges} {
-	dodiffindex
+        dodiffindex
     }
 }
 
@@ -9977,21 +9995,21 @@
     set id $headmenuid
     # this check shouldn't be needed any more...
     if {$head eq $mainhead} {
-	error_popup [mc "Cannot delete the currently checked-out branch"]
-	return
+        error_popup [mc "Cannot delete the currently checked-out branch"]
+        return
     }
     set dheads [descheads $id]
     if {[llength $dheads] == 1 && $idheads($dheads) eq $head} {
-	# the stuff on this branch isn't on any other branch
-	if {![confirm_popup [mc "The commits on branch %s aren't on any other\
-			branch.\nReally delete branch %s?" $head $head]]} return
+        # the stuff on this branch isn't on any other branch
+        if {![confirm_popup [mc "The commits on branch %s aren't on any other\
+                        branch.\nReally delete branch %s?" $head $head]]} return
     }
     nowbusy rmbranch
     update
     if {[catch {exec git branch -D $head} err]} {
-	notbusy rmbranch
-	error_popup $err
-	return
+        notbusy rmbranch
+        error_popup $err
+        return
     }
     removehead $id $head
     removedhead $id $head
@@ -10009,22 +10027,22 @@
     set top .showrefs
     set showrefstop $top
     if {[winfo exists $top]} {
-	raise $top
-	refill_reflist
-	return
+        raise $top
+        refill_reflist
+        return
     }
     ttk_toplevel $top
     wm title $top [mc "Tags and heads: %s" [file tail [pwd]]]
     make_transient $top .
     text $top.list -background $bgcolor -foreground $fgcolor \
-	-selectbackground $selectbgcolor -font mainfont \
-	-xscrollcommand "$top.xsb set" -yscrollcommand "$top.ysb set" \
-	-width 30 -height 20 -cursor $maincursor \
-	-spacing1 1 -spacing3 1 -state disabled
+        -selectbackground $selectbgcolor -font mainfont \
+        -xscrollcommand "$top.xsb set" -yscrollcommand "$top.ysb set" \
+        -width 30 -height 20 -cursor $maincursor \
+        -spacing1 1 -spacing3 1 -state disabled
     $top.list tag configure highlight -background $selectbgcolor
     if {![lsearch -exact $bglist $top.list]} {
-	lappend bglist $top.list
-	lappend fglist $top.list
+        lappend bglist $top.list
+        lappend fglist $top.list
     }
     ${NS}::scrollbar $top.ysb -command "$top.list yview" -orient vertical
     ${NS}::scrollbar $top.xsb -command "$top.list xview" -orient horizontal
@@ -10058,10 +10076,10 @@
     set ref [lindex $reflist [expr {$l-1}]]
     set n [lindex $ref 0]
     switch -- [lindex $ref 1] {
-	"H" {selbyid $headids($n)}
-	"R" {selbyid $headids($n)}
-	"T" {selbyid $tagids($n)}
-	"o" {selbyid $otherrefids($n)}
+        "H" {selbyid $headids($n)}
+        "R" {selbyid $headids($n)}
+        "T" {selbyid $tagids($n)}
+        "o" {selbyid $otherrefids($n)}
     }
     $showrefstop.list tag add highlight $l.0 "$l.0 lineend"
 }
@@ -10087,35 +10105,35 @@
     if {![info exists showrefstop] || ![winfo exists $showrefstop]} return
     set refs {}
     foreach n [array names headids] {
-	if {[string match $reflistfilter $n]} {
-	    if {[commitinview $headids($n) $curview]} {
-		if {[string match "remotes/*" $n]} {
-		    lappend refs [list $n R]
-		} else {
-		    lappend refs [list $n H]
-		}
-	    } else {
-		interestedin $headids($n) {run refill_reflist}
-	    }
-	}
+        if {[string match $reflistfilter $n]} {
+            if {[commitinview $headids($n) $curview]} {
+                if {[string match "remotes/*" $n]} {
+                    lappend refs [list $n R]
+                } else {
+                    lappend refs [list $n H]
+                }
+            } else {
+                interestedin $headids($n) {run refill_reflist}
+            }
+        }
     }
     foreach n [array names tagids] {
-	if {[string match $reflistfilter $n]} {
-	    if {[commitinview $tagids($n) $curview]} {
-		lappend refs [list $n T]
-	    } else {
-		interestedin $tagids($n) {run refill_reflist}
-	    }
-	}
+        if {[string match $reflistfilter $n]} {
+            if {[commitinview $tagids($n) $curview]} {
+                lappend refs [list $n T]
+            } else {
+                interestedin $tagids($n) {run refill_reflist}
+            }
+        }
     }
     foreach n [array names otherrefids] {
-	if {[string match $reflistfilter $n]} {
-	    if {[commitinview $otherrefids($n) $curview]} {
-		lappend refs [list $n o]
-	    } else {
-		interestedin $otherrefids($n) {run refill_reflist}
-	    }
-	}
+        if {[string match $reflistfilter $n]} {
+            if {[commitinview $otherrefids($n) $curview]} {
+                lappend refs [list $n o]
+            } else {
+                interestedin $otherrefids($n) {run refill_reflist}
+            }
+        }
     }
     set refs [lsort -index 0 $refs]
     if {$refs eq $reflist} return
@@ -10127,37 +10145,37 @@
     set i 0
     set j 0
     while {$i < [llength $reflist] || $j < [llength $refs]} {
-	if {$i < [llength $reflist]} {
-	    if {$j < [llength $refs]} {
-		set cmp [string compare [lindex $reflist $i 0] \
-			     [lindex $refs $j 0]]
-		if {$cmp == 0} {
-		    set cmp [string compare [lindex $reflist $i 1] \
-				 [lindex $refs $j 1]]
-		}
-	    } else {
-		set cmp -1
-	    }
-	} else {
-	    set cmp 1
-	}
-	switch -- $cmp {
-	    -1 {
-		$showrefstop.list delete "[expr {$j+1}].0" "[expr {$j+2}].0"
-		incr i
-	    }
-	    0 {
-		incr i
-		incr j
-	    }
-	    1 {
-		set l [expr {$j + 1}]
-		$showrefstop.list image create $l.0 -align baseline \
-		    -image reficon-[lindex $refs $j 1] -padx 2
-		$showrefstop.list insert $l.1 "[lindex $refs $j 0]\n"
-		incr j
-	    }
-	}
+        if {$i < [llength $reflist]} {
+            if {$j < [llength $refs]} {
+                set cmp [string compare [lindex $reflist $i 0] \
+                             [lindex $refs $j 0]]
+                if {$cmp == 0} {
+                    set cmp [string compare [lindex $reflist $i 1] \
+                                 [lindex $refs $j 1]]
+                }
+            } else {
+                set cmp -1
+            }
+        } else {
+            set cmp 1
+        }
+        switch -- $cmp {
+            -1 {
+                $showrefstop.list delete "[expr {$j+1}].0" "[expr {$j+2}].0"
+                incr i
+            }
+            0 {
+                incr i
+                incr j
+            }
+            1 {
+                set l [expr {$j + 1}]
+                $showrefstop.list image create $l.0 -align baseline \
+                    -image reficon-[lindex $refs $j 1] -padx 2
+                $showrefstop.list insert $l.1 "[lindex $refs $j 0]\n"
+                incr j
+            }
+        }
     }
     set reflist $refs
     # delete last newline
@@ -10172,54 +10190,54 @@
     global gitdir
 
     if {![info exists allcommits]} {
-	set nextarc 0
-	set allcommits 0
-	set seeds {}
-	set allcwait 0
-	set cachedarcs 0
-	set allccache [file join $gitdir "gitk.cache"]
-	if {![catch {
-	    set f [open $allccache r]
-	    set allcwait 1
-	    getcache $f
-	}]} return
+        set nextarc 0
+        set allcommits 0
+        set seeds {}
+        set allcwait 0
+        set cachedarcs 0
+        set allccache [file join $gitdir "gitk.cache"]
+        if {![catch {
+            set f [open $allccache r]
+            set allcwait 1
+            getcache $f
+        }]} return
     }
 
     if {$allcwait} {
-	return
+        return
     }
     set cmd [list | git rev-list --parents]
     set allcupdate [expr {$seeds ne {}}]
     if {!$allcupdate} {
-	set ids "--all"
+        set ids "--all"
     } else {
-	set refs [concat [array names idheads] [array names idtags] \
-		      [array names idotherrefs]]
-	set ids {}
-	set tagobjs {}
-	foreach name [array names tagobjid] {
-	    lappend tagobjs $tagobjid($name)
-	}
-	foreach id [lsort -unique $refs] {
-	    if {![info exists allparents($id)] &&
-		[lsearch -exact $tagobjs $id] < 0} {
-		lappend ids $id
-	    }
-	}
-	if {$ids ne {}} {
-	    foreach id $seeds {
-		lappend ids "^$id"
-	    }
-	}
+        set refs [concat [array names idheads] [array names idtags] \
+                      [array names idotherrefs]]
+        set ids {}
+        set tagobjs {}
+        foreach name [array names tagobjid] {
+            lappend tagobjs $tagobjid($name)
+        }
+        foreach id [lsort -unique $refs] {
+            if {![info exists allparents($id)] &&
+                [lsearch -exact $tagobjs $id] < 0} {
+                lappend ids $id
+            }
+        }
+        if {$ids ne {}} {
+            foreach id $seeds {
+                lappend ids "^$id"
+            }
+        }
     }
     if {$ids ne {}} {
-	set fd [open [concat $cmd $ids] r]
-	fconfigure $fd -blocking 0
-	incr allcommits
-	nowbusy allcommits
-	filerun $fd [list getallclines $fd]
+        set fd [open [concat $cmd $ids] r]
+        fconfigure $fd -blocking 0
+        incr allcommits
+        nowbusy allcommits
+        filerun $fd [list getallclines $fd]
     } else {
-	dispneartags 0
+        dispneartags 0
     }
 }
 
@@ -10245,103 +10263,103 @@
 
     set nid 0
     while {[incr nid] <= 1000 && [gets $fd line] >= 0} {
-	set id [lindex $line 0]
-	if {[info exists allparents($id)]} {
-	    # seen it already
-	    continue
-	}
-	set cachedarcs 0
-	set olds [lrange $line 1 end]
-	set allparents($id) $olds
-	if {![info exists allchildren($id)]} {
-	    set allchildren($id) {}
-	    set arcnos($id) {}
-	    lappend seeds $id
-	} else {
-	    set a $arcnos($id)
-	    if {[llength $olds] == 1 && [llength $a] == 1} {
-		lappend arcids($a) $id
-		if {[info exists idtags($id)]} {
-		    lappend arctags($a) $id
-		}
-		if {[info exists idheads($id)]} {
-		    lappend archeads($a) $id
-		}
-		if {[info exists allparents($olds)]} {
-		    # seen parent already
-		    if {![info exists arcout($olds)]} {
-			splitarc $olds
-		    }
-		    lappend arcids($a) $olds
-		    set arcend($a) $olds
-		    unset growing($a)
-		}
-		lappend allchildren($olds) $id
-		lappend arcnos($olds) $a
-		continue
-	    }
-	}
-	foreach a $arcnos($id) {
-	    lappend arcids($a) $id
-	    set arcend($a) $id
-	    unset growing($a)
-	}
+        set id [lindex $line 0]
+        if {[info exists allparents($id)]} {
+            # seen it already
+            continue
+        }
+        set cachedarcs 0
+        set olds [lrange $line 1 end]
+        set allparents($id) $olds
+        if {![info exists allchildren($id)]} {
+            set allchildren($id) {}
+            set arcnos($id) {}
+            lappend seeds $id
+        } else {
+            set a $arcnos($id)
+            if {[llength $olds] == 1 && [llength $a] == 1} {
+                lappend arcids($a) $id
+                if {[info exists idtags($id)]} {
+                    lappend arctags($a) $id
+                }
+                if {[info exists idheads($id)]} {
+                    lappend archeads($a) $id
+                }
+                if {[info exists allparents($olds)]} {
+                    # seen parent already
+                    if {![info exists arcout($olds)]} {
+                        splitarc $olds
+                    }
+                    lappend arcids($a) $olds
+                    set arcend($a) $olds
+                    unset growing($a)
+                }
+                lappend allchildren($olds) $id
+                lappend arcnos($olds) $a
+                continue
+            }
+        }
+        foreach a $arcnos($id) {
+            lappend arcids($a) $id
+            set arcend($a) $id
+            unset growing($a)
+        }
 
-	set ao {}
-	foreach p $olds {
-	    lappend allchildren($p) $id
-	    set a [incr nextarc]
-	    set arcstart($a) $id
-	    set archeads($a) {}
-	    set arctags($a) {}
-	    set archeads($a) {}
-	    set arcids($a) {}
-	    lappend ao $a
-	    set growing($a) 1
-	    if {[info exists allparents($p)]} {
-		# seen it already, may need to make a new branch
-		if {![info exists arcout($p)]} {
-		    splitarc $p
-		}
-		lappend arcids($a) $p
-		set arcend($a) $p
-		unset growing($a)
-	    }
-	    lappend arcnos($p) $a
-	}
-	set arcout($id) $ao
+        set ao {}
+        foreach p $olds {
+            lappend allchildren($p) $id
+            set a [incr nextarc]
+            set arcstart($a) $id
+            set archeads($a) {}
+            set arctags($a) {}
+            set archeads($a) {}
+            set arcids($a) {}
+            lappend ao $a
+            set growing($a) 1
+            if {[info exists allparents($p)]} {
+                # seen it already, may need to make a new branch
+                if {![info exists arcout($p)]} {
+                    splitarc $p
+                }
+                lappend arcids($a) $p
+                set arcend($a) $p
+                unset growing($a)
+            }
+            lappend arcnos($p) $a
+        }
+        set arcout($id) $ao
     }
     if {$nid > 0} {
-	global cached_dheads cached_dtags cached_atags
-	unset -nocomplain cached_dheads
-	unset -nocomplain cached_dtags
-	unset -nocomplain cached_atags
+        global cached_dheads cached_dtags cached_atags
+        unset -nocomplain cached_dheads
+        unset -nocomplain cached_dtags
+        unset -nocomplain cached_atags
     }
     if {![eof $fd]} {
-	return [expr {$nid >= 1000? 2: 1}]
+        return [expr {$nid >= 1000? 2: 1}]
     }
     set cacheok 1
     if {[catch {
-	fconfigure $fd -blocking 1
-	close $fd
+        fconfigure $fd -blocking 1
+        close $fd
     } err]} {
-	# got an error reading the list of commits
-	# if we were updating, try rereading the whole thing again
-	if {$allcupdate} {
-	    incr allcommits -1
-	    dropcache $err
-	    return
-	}
-	error_popup "[mc "Error reading commit topology information;\
-		branch and preceding/following tag information\
-	        will be incomplete."]\n($err)"
-	set cacheok 0
+        # got an error reading the list of commits
+        # if we were updating, try rereading the whole thing again
+        if {$allcupdate} {
+            incr allcommits -1
+            dropcache $err
+            return
+        }
+        error_popup "[mc "Error reading commit topology information;\
+                branch and preceding/following tag information\
+                will be incomplete."]\n($err)"
+        set cacheok 0
     }
     if {[incr allcommits -1] == 0} {
-	notbusy allcommits
-	if {$cacheok} {
-	    run savecache
-	}
+        notbusy allcommits
+        if {$cacheok} {
+            run savecache
+        }
     }
     dispneartags 0
     return 0
@@ -10353,12 +10371,12 @@
     set at {}
     set ah {}
     foreach id [lrange $arcids($a) 0 end-1] {
-	if {[info exists idtags($id)]} {
-	    lappend at $id
-	}
-	if {[info exists idheads($id)]} {
-	    lappend ah $id
-	}
+        if {[info exists idtags($id)]} {
+            lappend at $id
+        }
+        if {[info exists idheads($id)]} {
+            lappend ah $id
+        }
     }
     set arctags($a) $at
     set archeads($a) $ah
@@ -10370,22 +10388,22 @@
 
     set a $arcnos($p)
     if {[llength $a] != 1} {
-	puts "oops splitarc called but [llength $a] arcs already"
-	return
+        puts "oops splitarc called but [llength $a] arcs already"
+        return
     }
     set a [lindex $a 0]
     set i [lsearch -exact $arcids($a) $p]
     if {$i < 0} {
-	puts "oops splitarc $p not in arc $a"
-	return
+        puts "oops splitarc $p not in arc $a"
+        return
     }
     set na [incr nextarc]
     if {[info exists arcend($a)]} {
-	set arcend($na) $arcend($a)
+        set arcend($na) $arcend($a)
     } else {
-	set l [lindex $allparents([lindex $arcids($a) end]) 0]
-	set j [lsearch -exact $arcnos($l) $a]
-	set arcnos($l) [lreplace $arcnos($l) $j $j $na]
+        set l [lindex $allparents([lindex $arcids($a) end]) 0]
+        set j [lsearch -exact $arcnos($l) $a]
+        set arcnos($l) [lreplace $arcnos($l) $j $j $na]
     }
     set tail [lrange $arcids($a) [expr {$i+1}] end]
     set arcids($a) [lrange $arcids($a) 0 $i]
@@ -10394,26 +10412,26 @@
     set arcout($p) $na
     set arcids($na) $tail
     if {[info exists growing($a)]} {
-	set growing($na) 1
-	unset growing($a)
+        set growing($na) 1
+        unset growing($a)
     }
 
     foreach id $tail {
-	if {[llength $arcnos($id)] == 1} {
-	    set arcnos($id) $na
-	} else {
-	    set j [lsearch -exact $arcnos($id) $a]
-	    set arcnos($id) [lreplace $arcnos($id) $j $j $na]
-	}
+        if {[llength $arcnos($id)] == 1} {
+            set arcnos($id) $na
+        } else {
+            set j [lsearch -exact $arcnos($id) $a]
+            set arcnos($id) [lreplace $arcnos($id) $j $j $na]
+        }
     }
 
     # reconstruct tags and heads lists
     if {$arctags($a) ne {} || $archeads($a) ne {}} {
-	recalcarc $a
-	recalcarc $na
+        recalcarc $a
+        recalcarc $na
     } else {
-	set arctags($na) {}
-	set archeads($na) {}
+        set arctags($na) {}
+        set archeads($na) {}
     }
 }
 
@@ -10437,7 +10455,7 @@
     set arcids($a) [list $p]
     set arcend($a) $p
     if {![info exists arcout($p)]} {
-	splitarc $p
+        splitarc $p
     }
     lappend arcnos($p) $a
     set arcout($id) [list $a]
@@ -10454,78 +10472,78 @@
     set a $nextarc
     set lim $cachedarcs
     if {$lim - $a > 500} {
-	set lim [expr {$a + 500}]
+        set lim [expr {$a + 500}]
     }
     if {[catch {
-	if {$a == $lim} {
-	    # finish reading the cache and setting up arctags, etc.
-	    set line [gets $f]
-	    if {$line ne "1"} {error "bad final version"}
-	    close $f
-	    foreach id [array names idtags] {
-		if {[info exists arcnos($id)] && [llength $arcnos($id)] == 1 &&
-		    [llength $allparents($id)] == 1} {
-		    set a [lindex $arcnos($id) 0]
-		    if {$arctags($a) eq {}} {
-			recalcarc $a
-		    }
-		}
-	    }
-	    foreach id [array names idheads] {
-		if {[info exists arcnos($id)] && [llength $arcnos($id)] == 1 &&
-		    [llength $allparents($id)] == 1} {
-		    set a [lindex $arcnos($id) 0]
-		    if {$archeads($a) eq {}} {
-			recalcarc $a
-		    }
-		}
-	    }
-	    foreach id [lsort -unique $possible_seeds] {
-		if {$arcnos($id) eq {}} {
-		    lappend seeds $id
-		}
-	    }
-	    set allcwait 0
-	} else {
-	    while {[incr a] <= $lim} {
-		set line [gets $f]
-		if {[llength $line] != 3} {error "bad line"}
-		set s [lindex $line 0]
-		set arcstart($a) $s
-		lappend arcout($s) $a
-		if {![info exists arcnos($s)]} {
-		    lappend possible_seeds $s
-		    set arcnos($s) {}
-		}
-		set e [lindex $line 1]
-		if {$e eq {}} {
-		    set growing($a) 1
-		} else {
-		    set arcend($a) $e
-		    if {![info exists arcout($e)]} {
-			set arcout($e) {}
-		    }
-		}
-		set arcids($a) [lindex $line 2]
-		foreach id $arcids($a) {
-		    lappend allparents($s) $id
-		    set s $id
-		    lappend arcnos($id) $a
-		}
-		if {![info exists allparents($s)]} {
-		    set allparents($s) {}
-		}
-		set arctags($a) {}
-		set archeads($a) {}
-	    }
-	    set nextarc [expr {$a - 1}]
-	}
+        if {$a == $lim} {
+            # finish reading the cache and setting up arctags, etc.
+            set line [gets $f]
+            if {$line ne "1"} {error "bad final version"}
+            close $f
+            foreach id [array names idtags] {
+                if {[info exists arcnos($id)] && [llength $arcnos($id)] == 1 &&
+                    [llength $allparents($id)] == 1} {
+                    set a [lindex $arcnos($id) 0]
+                    if {$arctags($a) eq {}} {
+                        recalcarc $a
+                    }
+                }
+            }
+            foreach id [array names idheads] {
+                if {[info exists arcnos($id)] && [llength $arcnos($id)] == 1 &&
+                    [llength $allparents($id)] == 1} {
+                    set a [lindex $arcnos($id) 0]
+                    if {$archeads($a) eq {}} {
+                        recalcarc $a
+                    }
+                }
+            }
+            foreach id [lsort -unique $possible_seeds] {
+                if {$arcnos($id) eq {}} {
+                    lappend seeds $id
+                }
+            }
+            set allcwait 0
+        } else {
+            while {[incr a] <= $lim} {
+                set line [gets $f]
+                if {[llength $line] != 3} {error "bad line"}
+                set s [lindex $line 0]
+                set arcstart($a) $s
+                lappend arcout($s) $a
+                if {![info exists arcnos($s)]} {
+                    lappend possible_seeds $s
+                    set arcnos($s) {}
+                }
+                set e [lindex $line 1]
+                if {$e eq {}} {
+                    set growing($a) 1
+                } else {
+                    set arcend($a) $e
+                    if {![info exists arcout($e)]} {
+                        set arcout($e) {}
+                    }
+                }
+                set arcids($a) [lindex $line 2]
+                foreach id $arcids($a) {
+                    lappend allparents($s) $id
+                    set s $id
+                    lappend arcnos($id) $a
+                }
+                if {![info exists allparents($s)]} {
+                    set allparents($s) {}
+                }
+                set arctags($a) {}
+                set archeads($a) {}
+            }
+            set nextarc [expr {$a - 1}]
+        }
     } err]} {
-	dropcache $err
-	return 0
+        dropcache $err
+        return 0
     }
     if {!$allcwait} {
-	getallcommits
+        getallcommits
     }
     return $allcwait
 }
@@ -10534,16 +10552,16 @@
     global nextarc cachedarcs possible_seeds
 
     if {[catch {
-	set line [gets $f]
-	if {[llength $line] != 2 || [lindex $line 0] ne "1"} {error "bad version"}
-	# make sure it's an integer
-	set cachedarcs [expr {int([lindex $line 1])}]
-	if {$cachedarcs < 0} {error "bad number of arcs"}
-	set nextarc 0
-	set possible_seeds {}
-	run readcache $f
+        set line [gets $f]
+        if {[llength $line] != 2 || [lindex $line 0] ne "1"} {error "bad version"}
+        # make sure it's an integer
+        set cachedarcs [expr {int([lindex $line 1])}]
+        if {$cachedarcs < 0} {error "bad number of arcs"}
+        set nextarc 0
+        set possible_seeds {}
+        run readcache $f
     } err]} {
-	dropcache $err
+        dropcache $err
     }
     return 0
 }
@@ -10553,9 +10571,9 @@
 
     #puts "dropping cache ($err)"
     foreach v {arcnos arcout arcids arcstart arcend growing \
-		   arctags archeads allparents allchildren} {
-	global $v
-	unset -nocomplain $v
+                   arctags archeads allparents allchildren} {
+        global $v
+        unset -nocomplain $v
     }
     set allcwait 0
     set nextarc 0
@@ -10571,27 +10589,27 @@
     set a $cachearc
     set lim $cachedarcs
     if {$lim - $a > 1000} {
-	set lim [expr {$a + 1000}]
+        set lim [expr {$a + 1000}]
     }
     if {[catch {
-	while {[incr a] <= $lim} {
-	    if {[info exists arcend($a)]} {
-		puts $f [list $arcstart($a) $arcend($a) $arcids($a)]
-	    } else {
-		puts $f [list $arcstart($a) {} $arcids($a)]
-	    }
-	}
+        while {[incr a] <= $lim} {
+            if {[info exists arcend($a)]} {
+                puts $f [list $arcstart($a) $arcend($a) $arcids($a)]
+            } else {
+                puts $f [list $arcstart($a) {} $arcids($a)]
+            }
+        }
     } err]} {
-	catch {close $f}
-	catch {file delete $allccache}
-	#puts "writing cache failed ($err)"
-	return 0
+        catch {close $f}
+        catch {file delete $allccache}
+        #puts "writing cache failed ($err)"
+        return 0
     }
     set cachearc [expr {$a - 1}]
     if {$a > $cachedarcs} {
-	puts $f "1"
-	close $f
-	return 0
+        puts $f "1"
+        close $f
+        return 0
     }
     return 1
 }
@@ -10603,9 +10621,9 @@
     set cachearc 0
     set cachedarcs $nextarc
     catch {
-	set f [open $allccache w]
-	puts $f [list 1 $cachedarcs]
-	run writecache $f
+        set f [open $allccache w]
+        puts $f [list 1 $cachedarcs]
+        run writecache $f
     }
 }
 
@@ -10615,92 +10633,92 @@
     global arcout arcstart arcend arcnos cached_isanc
 
     if {$arcnos($a) eq $arcnos($b)} {
-	# Both are on the same arc(s); either both are the same BMP,
-	# or if one is not a BMP, the other is also not a BMP or is
-	# the BMP at end of the arc (and it only has 1 incoming arc).
-	# Or both can be BMPs with no incoming arcs.
-	if {$a eq $b || $arcnos($a) eq {}} {
-	    return 0
-	}
-	# assert {[llength $arcnos($a)] == 1}
-	set arc [lindex $arcnos($a) 0]
-	set i [lsearch -exact $arcids($arc) $a]
-	set j [lsearch -exact $arcids($arc) $b]
-	if {$i < 0 || $i > $j} {
-	    return 1
-	} else {
-	    return -1
-	}
+        # Both are on the same arc(s); either both are the same BMP,
+        # or if one is not a BMP, the other is also not a BMP or is
+        # the BMP at end of the arc (and it only has 1 incoming arc).
+        # Or both can be BMPs with no incoming arcs.
+        if {$a eq $b || $arcnos($a) eq {}} {
+            return 0
+        }
+        # assert {[llength $arcnos($a)] == 1}
+        set arc [lindex $arcnos($a) 0]
+        set i [lsearch -exact $arcids($arc) $a]
+        set j [lsearch -exact $arcids($arc) $b]
+        if {$i < 0 || $i > $j} {
+            return 1
+        } else {
+            return -1
+        }
     }
 
     if {![info exists arcout($a)]} {
-	set arc [lindex $arcnos($a) 0]
-	if {[info exists arcend($arc)]} {
-	    set aend $arcend($arc)
-	} else {
-	    set aend {}
-	}
-	set a $arcstart($arc)
+        set arc [lindex $arcnos($a) 0]
+        if {[info exists arcend($arc)]} {
+            set aend $arcend($arc)
+        } else {
+            set aend {}
+        }
+        set a $arcstart($arc)
     } else {
-	set aend $a
+        set aend $a
     }
     if {![info exists arcout($b)]} {
-	set arc [lindex $arcnos($b) 0]
-	if {[info exists arcend($arc)]} {
-	    set bend $arcend($arc)
-	} else {
-	    set bend {}
-	}
-	set b $arcstart($arc)
+        set arc [lindex $arcnos($b) 0]
+        if {[info exists arcend($arc)]} {
+            set bend $arcend($arc)
+        } else {
+            set bend {}
+        }
+        set b $arcstart($arc)
     } else {
-	set bend $b
+        set bend $b
     }
     if {$a eq $bend} {
-	return 1
+        return 1
     }
     if {$b eq $aend} {
-	return -1
+        return -1
     }
     if {[info exists cached_isanc($a,$bend)]} {
-	if {$cached_isanc($a,$bend)} {
-	    return 1
-	}
+        if {$cached_isanc($a,$bend)} {
+            return 1
+        }
     }
     if {[info exists cached_isanc($b,$aend)]} {
-	if {$cached_isanc($b,$aend)} {
-	    return -1
-	}
-	if {[info exists cached_isanc($a,$bend)]} {
-	    return 0
-	}
+        if {$cached_isanc($b,$aend)} {
+            return -1
+        }
+        if {[info exists cached_isanc($a,$bend)]} {
+            return 0
+        }
     }
 
     set todo [list $a $b]
     set anc($a) a
     set anc($b) b
     for {set i 0} {$i < [llength $todo]} {incr i} {
-	set x [lindex $todo $i]
-	if {$anc($x) eq {}} {
-	    continue
-	}
-	foreach arc $arcnos($x) {
-	    set xd $arcstart($arc)
-	    if {$xd eq $bend} {
-		set cached_isanc($a,$bend) 1
-		set cached_isanc($b,$aend) 0
-		return 1
-	    } elseif {$xd eq $aend} {
-		set cached_isanc($b,$aend) 1
-		set cached_isanc($a,$bend) 0
-		return -1
-	    }
-	    if {![info exists anc($xd)]} {
-		set anc($xd) $anc($x)
-		lappend todo $xd
-	    } elseif {$anc($xd) ne $anc($x)} {
-		set anc($xd) {}
-	    }
-	}
+        set x [lindex $todo $i]
+        if {$anc($x) eq {}} {
+            continue
+        }
+        foreach arc $arcnos($x) {
+            set xd $arcstart($arc)
+            if {$xd eq $bend} {
+                set cached_isanc($a,$bend) 1
+                set cached_isanc($b,$aend) 0
+                return 1
+            } elseif {$xd eq $aend} {
+                set cached_isanc($b,$aend) 1
+                set cached_isanc($a,$bend) 0
+                return -1
+            }
+            if {![info exists anc($xd)]} {
+                set anc($xd) $anc($x)
+                lappend todo $xd
+            } elseif {$anc($xd) ne $anc($x)} {
+                set anc($xd) {}
+            }
+        }
     }
     set cached_isanc($a,$bend) 0
     set cached_isanc($b,$aend) 0
@@ -10723,90 +10741,90 @@
 
     set certain {}
     if {[llength $arcnos($anc)] == 1} {
-	# tags on the same arc are certain
-	if {$arcnos($desc) eq $arcnos($anc)} {
-	    return 1
-	}
-	if {![info exists arcout($anc)]} {
-	    # if $anc is partway along an arc, use the start of the arc instead
-	    set a [lindex $arcnos($anc) 0]
-	    set anc $arcstart($a)
-	}
+        # tags on the same arc are certain
+        if {$arcnos($desc) eq $arcnos($anc)} {
+            return 1
+        }
+        if {![info exists arcout($anc)]} {
+            # if $anc is partway along an arc, use the start of the arc instead
+            set a [lindex $arcnos($anc) 0]
+            set anc $arcstart($a)
+        }
     }
     if {[llength $arcnos($desc)] > 1 || [info exists arcout($desc)]} {
-	set x $desc
+        set x $desc
     } else {
-	set a [lindex $arcnos($desc) 0]
-	set x $arcend($a)
+        set a [lindex $arcnos($desc) 0]
+        set x $arcend($a)
     }
     if {$x == $anc} {
-	return 1
+        return 1
     }
     set anclist [list $x]
     set dl($x) 1
     set nnh 1
     set ngrowanc 0
     for {set i 0} {$i < [llength $anclist] && ($nnh > 0 || $ngrowanc > 0)} {incr i} {
-	set x [lindex $anclist $i]
-	if {$dl($x)} {
-	    incr nnh -1
-	}
-	set done($x) 1
-	foreach a $arcout($x) {
-	    if {[info exists growing($a)]} {
-		if {![info exists growanc($x)] && $dl($x)} {
-		    set growanc($x) 1
-		    incr ngrowanc
-		}
-	    } else {
-		set y $arcend($a)
-		if {[info exists dl($y)]} {
-		    if {$dl($y)} {
-			if {!$dl($x)} {
-			    set dl($y) 0
-			    if {![info exists done($y)]} {
-				incr nnh -1
-			    }
-			    if {[info exists growanc($x)]} {
-				incr ngrowanc -1
-			    }
-			    set xl [list $y]
-			    for {set k 0} {$k < [llength $xl]} {incr k} {
-				set z [lindex $xl $k]
-				foreach c $arcout($z) {
-				    if {[info exists arcend($c)]} {
-					set v $arcend($c)
-					if {[info exists dl($v)] && $dl($v)} {
-					    set dl($v) 0
-					    if {![info exists done($v)]} {
-						incr nnh -1
-					    }
-					    if {[info exists growanc($v)]} {
-						incr ngrowanc -1
-					    }
-					    lappend xl $v
-					}
-				    }
-				}
-			    }
-			}
-		    }
-		} elseif {$y eq $anc || !$dl($x)} {
-		    set dl($y) 0
-		    lappend anclist $y
-		} else {
-		    set dl($y) 1
-		    lappend anclist $y
-		    incr nnh
-		}
-	    }
-	}
+        set x [lindex $anclist $i]
+        if {$dl($x)} {
+            incr nnh -1
+        }
+        set done($x) 1
+        foreach a $arcout($x) {
+            if {[info exists growing($a)]} {
+                if {![info exists growanc($x)] && $dl($x)} {
+                    set growanc($x) 1
+                    incr ngrowanc
+                }
+            } else {
+                set y $arcend($a)
+                if {[info exists dl($y)]} {
+                    if {$dl($y)} {
+                        if {!$dl($x)} {
+                            set dl($y) 0
+                            if {![info exists done($y)]} {
+                                incr nnh -1
+                            }
+                            if {[info exists growanc($x)]} {
+                                incr ngrowanc -1
+                            }
+                            set xl [list $y]
+                            for {set k 0} {$k < [llength $xl]} {incr k} {
+                                set z [lindex $xl $k]
+                                foreach c $arcout($z) {
+                                    if {[info exists arcend($c)]} {
+                                        set v $arcend($c)
+                                        if {[info exists dl($v)] && $dl($v)} {
+                                            set dl($v) 0
+                                            if {![info exists done($v)]} {
+                                                incr nnh -1
+                                            }
+                                            if {[info exists growanc($v)]} {
+                                                incr ngrowanc -1
+                                            }
+                                            lappend xl $v
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                } elseif {$y eq $anc || !$dl($x)} {
+                    set dl($y) 0
+                    lappend anclist $y
+                } else {
+                    set dl($y) 1
+                    lappend anclist $y
+                    incr nnh
+                }
+            }
+        }
     }
     foreach x [array names growanc] {
-	if {$dl($x)} {
-	    return 0
-	}
-	return 0
+        if {$dl($x)} {
+            return 0
+        }
+        return 0
     }
     return 1
 }
@@ -10817,11 +10835,11 @@
     set i -1
     set na $arctags($a)
     foreach id $arctags($a) {
-	incr i
-	if {![info exists idtags($id)]} {
-	    set na [lreplace $na $i $i]
-	    incr i -1
-	}
+        incr i
+        if {![info exists idtags($id)]} {
+            set na [lreplace $na $i $i]
+            incr i -1
+        }
     }
     set arctags($a) $na
 }
@@ -10832,11 +10850,11 @@
     set i -1
     set na $archeads($a)
     foreach id $archeads($a) {
-	incr i
-	if {![info exists idheads($id)]} {
-	    set na [lreplace $na $i $i]
-	    incr i -1
-	}
+        incr i
+        if {![info exists idheads($id)]} {
+            set na [lreplace $na $i $i]
+            incr i -1
+        }
     }
     set archeads($a) $na
 }
@@ -10848,33 +10866,33 @@
     global growing cached_dtags
 
     if {![info exists allparents($id)]} {
-	return {}
+        return {}
     }
     set t1 [clock clicks -milliseconds]
     set argid $id
     if {[llength $arcnos($id)] == 1 && [llength $allparents($id)] == 1} {
-	# part-way along an arc; check that arc first
-	set a [lindex $arcnos($id) 0]
-	if {$arctags($a) ne {}} {
-	    validate_arctags $a
-	    set i [lsearch -exact $arcids($a) $id]
-	    set tid {}
-	    foreach t $arctags($a) {
-		set j [lsearch -exact $arcids($a) $t]
-		if {$j >= $i} break
-		set tid $t
-	    }
-	    if {$tid ne {}} {
-		return $tid
-	    }
-	}
-	set id $arcstart($a)
-	if {[info exists idtags($id)]} {
-	    return $id
-	}
+        # part-way along an arc; check that arc first
+        set a [lindex $arcnos($id) 0]
+        if {$arctags($a) ne {}} {
+            validate_arctags $a
+            set i [lsearch -exact $arcids($a) $id]
+            set tid {}
+            foreach t $arctags($a) {
+                set j [lsearch -exact $arcids($a) $t]
+                if {$j >= $i} break
+                set tid $t
+            }
+            if {$tid ne {}} {
+                return $tid
+            }
+        }
+        set id $arcstart($a)
+        if {[info exists idtags($id)]} {
+            return $id
+        }
     }
     if {[info exists cached_dtags($id)]} {
-	return $cached_dtags($id)
+        return $cached_dtags($id)
     }
 
     set origid $id
@@ -10882,111 +10900,111 @@
     set queued($id) 1
     set nc 1
     for {set i 0} {$i < [llength $todo] && $nc > 0} {incr i} {
-	set id [lindex $todo $i]
-	set done($id) 1
-	set ta [info exists hastaggedancestor($id)]
-	if {!$ta} {
-	    incr nc -1
-	}
-	# ignore tags on starting node
-	if {!$ta && $i > 0} {
-	    if {[info exists idtags($id)]} {
-		set tagloc($id) $id
-		set ta 1
-	    } elseif {[info exists cached_dtags($id)]} {
-		set tagloc($id) $cached_dtags($id)
-		set ta 1
-	    }
-	}
-	foreach a $arcnos($id) {
-	    set d $arcstart($a)
-	    if {!$ta && $arctags($a) ne {}} {
-		validate_arctags $a
-		if {$arctags($a) ne {}} {
-		    lappend tagloc($id) [lindex $arctags($a) end]
-		}
-	    }
-	    if {$ta || $arctags($a) ne {}} {
-		set tomark [list $d]
-		for {set j 0} {$j < [llength $tomark]} {incr j} {
-		    set dd [lindex $tomark $j]
-		    if {![info exists hastaggedancestor($dd)]} {
-			if {[info exists done($dd)]} {
-			    foreach b $arcnos($dd) {
-				lappend tomark $arcstart($b)
-			    }
-			    if {[info exists tagloc($dd)]} {
-				unset tagloc($dd)
-			    }
-			} elseif {[info exists queued($dd)]} {
-			    incr nc -1
-			}
-			set hastaggedancestor($dd) 1
-		    }
-		}
-	    }
-	    if {![info exists queued($d)]} {
-		lappend todo $d
-		set queued($d) 1
-		if {![info exists hastaggedancestor($d)]} {
-		    incr nc
-		}
-	    }
-	}
+        set id [lindex $todo $i]
+        set done($id) 1
+        set ta [info exists hastaggedancestor($id)]
+        if {!$ta} {
+            incr nc -1
+        }
+        # ignore tags on starting node
+        if {!$ta && $i > 0} {
+            if {[info exists idtags($id)]} {
+                set tagloc($id) $id
+                set ta 1
+            } elseif {[info exists cached_dtags($id)]} {
+                set tagloc($id) $cached_dtags($id)
+                set ta 1
+            }
+        }
+        foreach a $arcnos($id) {
+            set d $arcstart($a)
+            if {!$ta && $arctags($a) ne {}} {
+                validate_arctags $a
+                if {$arctags($a) ne {}} {
+                    lappend tagloc($id) [lindex $arctags($a) end]
+                }
+            }
+            if {$ta || $arctags($a) ne {}} {
+                set tomark [list $d]
+                for {set j 0} {$j < [llength $tomark]} {incr j} {
+                    set dd [lindex $tomark $j]
+                    if {![info exists hastaggedancestor($dd)]} {
+                        if {[info exists done($dd)]} {
+                            foreach b $arcnos($dd) {
+                                lappend tomark $arcstart($b)
+                            }
+                            if {[info exists tagloc($dd)]} {
+                                unset tagloc($dd)
+                            }
+                        } elseif {[info exists queued($dd)]} {
+                            incr nc -1
+                        }
+                        set hastaggedancestor($dd) 1
+                    }
+                }
+            }
+            if {![info exists queued($d)]} {
+                lappend todo $d
+                set queued($d) 1
+                if {![info exists hastaggedancestor($d)]} {
+                    incr nc
+                }
+            }
+        }
     }
     set tags {}
     foreach id [array names tagloc] {
-	if {![info exists hastaggedancestor($id)]} {
-	    foreach t $tagloc($id) {
-		if {[lsearch -exact $tags $t] < 0} {
-		    lappend tags $t
-		}
-	    }
-	}
+        if {![info exists hastaggedancestor($id)]} {
+            foreach t $tagloc($id) {
+                if {[lsearch -exact $tags $t] < 0} {
+                    lappend tags $t
+                }
+            }
+        }
     }
     set t2 [clock clicks -milliseconds]
     set loopix $i
 
     # remove tags that are descendents of other tags
     for {set i 0} {$i < [llength $tags]} {incr i} {
-	set a [lindex $tags $i]
-	for {set j 0} {$j < $i} {incr j} {
-	    set b [lindex $tags $j]
-	    set r [anc_or_desc $a $b]
-	    if {$r == 1} {
-		set tags [lreplace $tags $j $j]
-		incr j -1
-		incr i -1
-	    } elseif {$r == -1} {
-		set tags [lreplace $tags $i $i]
-		incr i -1
-		break
-	    }
-	}
+        set a [lindex $tags $i]
+        for {set j 0} {$j < $i} {incr j} {
+            set b [lindex $tags $j]
+            set r [anc_or_desc $a $b]
+            if {$r == 1} {
+                set tags [lreplace $tags $j $j]
+                incr j -1
+                incr i -1
+            } elseif {$r == -1} {
+                set tags [lreplace $tags $i $i]
+                incr i -1
+                break
+            }
+        }
     }
 
     if {[array names growing] ne {}} {
-	# graph isn't finished, need to check if any tag could get
-	# eclipsed by another tag coming later.  Simply ignore any
-	# tags that could later get eclipsed.
-	set ctags {}
-	foreach t $tags {
-	    if {[is_certain $t $origid]} {
-		lappend ctags $t
-	    }
-	}
-	if {$tags eq $ctags} {
-	    set cached_dtags($origid) $tags
-	} else {
-	    set tags $ctags
-	}
+        # graph isn't finished, need to check if any tag could get
+        # eclipsed by another tag coming later.  Simply ignore any
+        # tags that could later get eclipsed.
+        set ctags {}
+        foreach t $tags {
+            if {[is_certain $t $origid]} {
+                lappend ctags $t
+            }
+        }
+        if {$tags eq $ctags} {
+            set cached_dtags($origid) $tags
+        } else {
+            set tags $ctags
+        }
     } else {
-	set cached_dtags($origid) $tags
+        set cached_dtags($origid) $tags
     }
     set t3 [clock clicks -milliseconds]
     if {0 && $t3 - $t1 >= 100} {
-	puts "iterating descendents ($loopix/[llength $todo] nodes) took\
-    	    [expr {$t2-$t1}]+[expr {$t3-$t2}]ms, $nc candidates left"
+        puts "iterating descendents ($loopix/[llength $todo] nodes) took\
+            [expr {$t2-$t1}]+[expr {$t3-$t2}]ms, $nc candidates left"
     }
     return $tags
 }
@@ -10996,33 +11014,33 @@
     global growing cached_atags
 
     if {![info exists allparents($id)]} {
-	return {}
+        return {}
     }
     set t1 [clock clicks -milliseconds]
     set argid $id
     if {[llength $arcnos($id)] == 1 && [llength $allparents($id)] == 1} {
-	# part-way along an arc; check that arc first
-	set a [lindex $arcnos($id) 0]
-	if {$arctags($a) ne {}} {
-	    validate_arctags $a
-	    set i [lsearch -exact $arcids($a) $id]
-	    foreach t $arctags($a) {
-		set j [lsearch -exact $arcids($a) $t]
-		if {$j > $i} {
-		    return $t
-		}
-	    }
-	}
-	if {![info exists arcend($a)]} {
-	    return {}
-	}
-	set id $arcend($a)
-	if {[info exists idtags($id)]} {
-	    return $id
-	}
+        # part-way along an arc; check that arc first
+        set a [lindex $arcnos($id) 0]
+        if {$arctags($a) ne {}} {
+            validate_arctags $a
+            set i [lsearch -exact $arcids($a) $id]
+            foreach t $arctags($a) {
+                set j [lsearch -exact $arcids($a) $t]
+                if {$j > $i} {
+                    return $t
+                }
+            }
+        }
+        if {![info exists arcend($a)]} {
+            return {}
+        }
+        set id $arcend($a)
+        if {[info exists idtags($id)]} {
+            return $id
+        }
     }
     if {[info exists cached_atags($id)]} {
-	return $cached_atags($id)
+        return $cached_atags($id)
     }
 
     set origid $id
@@ -11031,114 +11049,114 @@
     set taglist {}
     set nc 1
     for {set i 0} {$i < [llength $todo] && $nc > 0} {incr i} {
-	set id [lindex $todo $i]
-	set done($id) 1
-	set td [info exists hastaggeddescendent($id)]
-	if {!$td} {
-	    incr nc -1
-	}
-	# ignore tags on starting node
-	if {!$td && $i > 0} {
-	    if {[info exists idtags($id)]} {
-		set tagloc($id) $id
-		set td 1
-	    } elseif {[info exists cached_atags($id)]} {
-		set tagloc($id) $cached_atags($id)
-		set td 1
-	    }
-	}
-	foreach a $arcout($id) {
-	    if {!$td && $arctags($a) ne {}} {
-		validate_arctags $a
-		if {$arctags($a) ne {}} {
-		    lappend tagloc($id) [lindex $arctags($a) 0]
-		}
-	    }
-	    if {![info exists arcend($a)]} continue
-	    set d $arcend($a)
-	    if {$td || $arctags($a) ne {}} {
-		set tomark [list $d]
-		for {set j 0} {$j < [llength $tomark]} {incr j} {
-		    set dd [lindex $tomark $j]
-		    if {![info exists hastaggeddescendent($dd)]} {
-			if {[info exists done($dd)]} {
-			    foreach b $arcout($dd) {
-				if {[info exists arcend($b)]} {
-				    lappend tomark $arcend($b)
-				}
-			    }
-			    if {[info exists tagloc($dd)]} {
-				unset tagloc($dd)
-			    }
-			} elseif {[info exists queued($dd)]} {
-			    incr nc -1
-			}
-			set hastaggeddescendent($dd) 1
-		    }
-		}
-	    }
-	    if {![info exists queued($d)]} {
-		lappend todo $d
-		set queued($d) 1
-		if {![info exists hastaggeddescendent($d)]} {
-		    incr nc
-		}
-	    }
-	}
+        set id [lindex $todo $i]
+        set done($id) 1
+        set td [info exists hastaggeddescendent($id)]
+        if {!$td} {
+            incr nc -1
+        }
+        # ignore tags on starting node
+        if {!$td && $i > 0} {
+            if {[info exists idtags($id)]} {
+                set tagloc($id) $id
+                set td 1
+            } elseif {[info exists cached_atags($id)]} {
+                set tagloc($id) $cached_atags($id)
+                set td 1
+            }
+        }
+        foreach a $arcout($id) {
+            if {!$td && $arctags($a) ne {}} {
+                validate_arctags $a
+                if {$arctags($a) ne {}} {
+                    lappend tagloc($id) [lindex $arctags($a) 0]
+                }
+            }
+            if {![info exists arcend($a)]} continue
+            set d $arcend($a)
+            if {$td || $arctags($a) ne {}} {
+                set tomark [list $d]
+                for {set j 0} {$j < [llength $tomark]} {incr j} {
+                    set dd [lindex $tomark $j]
+                    if {![info exists hastaggeddescendent($dd)]} {
+                        if {[info exists done($dd)]} {
+                            foreach b $arcout($dd) {
+                                if {[info exists arcend($b)]} {
+                                    lappend tomark $arcend($b)
+                                }
+                            }
+                            if {[info exists tagloc($dd)]} {
+                                unset tagloc($dd)
+                            }
+                        } elseif {[info exists queued($dd)]} {
+                            incr nc -1
+                        }
+                        set hastaggeddescendent($dd) 1
+                    }
+                }
+            }
+            if {![info exists queued($d)]} {
+                lappend todo $d
+                set queued($d) 1
+                if {![info exists hastaggeddescendent($d)]} {
+                    incr nc
+                }
+            }
+        }
     }
     set t2 [clock clicks -milliseconds]
     set loopix $i
     set tags {}
     foreach id [array names tagloc] {
-	if {![info exists hastaggeddescendent($id)]} {
-	    foreach t $tagloc($id) {
-		if {[lsearch -exact $tags $t] < 0} {
-		    lappend tags $t
-		}
-	    }
-	}
+        if {![info exists hastaggeddescendent($id)]} {
+            foreach t $tagloc($id) {
+                if {[lsearch -exact $tags $t] < 0} {
+                    lappend tags $t
+                }
+            }
+        }
     }
 
     # remove tags that are ancestors of other tags
     for {set i 0} {$i < [llength $tags]} {incr i} {
-	set a [lindex $tags $i]
-	for {set j 0} {$j < $i} {incr j} {
-	    set b [lindex $tags $j]
-	    set r [anc_or_desc $a $b]
-	    if {$r == -1} {
-		set tags [lreplace $tags $j $j]
-		incr j -1
-		incr i -1
-	    } elseif {$r == 1} {
-		set tags [lreplace $tags $i $i]
-		incr i -1
-		break
-	    }
-	}
+        set a [lindex $tags $i]
+        for {set j 0} {$j < $i} {incr j} {
+            set b [lindex $tags $j]
+            set r [anc_or_desc $a $b]
+            if {$r == -1} {
+                set tags [lreplace $tags $j $j]
+                incr j -1
+                incr i -1
+            } elseif {$r == 1} {
+                set tags [lreplace $tags $i $i]
+                incr i -1
+                break
+            }
+        }
     }
 
     if {[array names growing] ne {}} {
-	# graph isn't finished, need to check if any tag could get
-	# eclipsed by another tag coming later.  Simply ignore any
-	# tags that could later get eclipsed.
-	set ctags {}
-	foreach t $tags {
-	    if {[is_certain $origid $t]} {
-		lappend ctags $t
-	    }
-	}
-	if {$tags eq $ctags} {
-	    set cached_atags($origid) $tags
-	} else {
-	    set tags $ctags
-	}
+        # graph isn't finished, need to check if any tag could get
+        # eclipsed by another tag coming later.  Simply ignore any
+        # tags that could later get eclipsed.
+        set ctags {}
+        foreach t $tags {
+            if {[is_certain $origid $t]} {
+                lappend ctags $t
+            }
+        }
+        if {$tags eq $ctags} {
+            set cached_atags($origid) $tags
+        } else {
+            set tags $ctags
+        }
     } else {
-	set cached_atags($origid) $tags
+        set cached_atags($origid) $tags
     }
     set t3 [clock clicks -milliseconds]
     if {0 && $t3 - $t1 >= 100} {
-	puts "iterating ancestors ($loopix/[llength $todo] nodes) took\
-    	    [expr {$t2-$t1}]+[expr {$t3-$t2}]ms, $nc candidates left"
+        puts "iterating ancestors ($loopix/[llength $todo] nodes) took\
+            [expr {$t2-$t1}]+[expr {$t3-$t2}]ms, $nc candidates left"
     }
     return $tags
 }
@@ -11150,49 +11168,49 @@
     global allparents arcout
 
     if {![info exists allparents($id)]} {
-	return {}
+        return {}
     }
     set aret {}
     if {![info exists arcout($id)]} {
-	# part-way along an arc; check it first
-	set a [lindex $arcnos($id) 0]
-	if {$archeads($a) ne {}} {
-	    validate_archeads $a
-	    set i [lsearch -exact $arcids($a) $id]
-	    foreach t $archeads($a) {
-		set j [lsearch -exact $arcids($a) $t]
-		if {$j > $i} break
-		lappend aret $t
-	    }
-	}
-	set id $arcstart($a)
+        # part-way along an arc; check it first
+        set a [lindex $arcnos($id) 0]
+        if {$archeads($a) ne {}} {
+            validate_archeads $a
+            set i [lsearch -exact $arcids($a) $id]
+            foreach t $archeads($a) {
+                set j [lsearch -exact $arcids($a) $t]
+                if {$j > $i} break
+                lappend aret $t
+            }
+        }
+        set id $arcstart($a)
     }
     set origid $id
     set todo [list $id]
     set seen($id) 1
     set ret {}
     for {set i 0} {$i < [llength $todo]} {incr i} {
-	set id [lindex $todo $i]
-	if {[info exists cached_dheads($id)]} {
-	    set ret [concat $ret $cached_dheads($id)]
-	} else {
-	    if {[info exists idheads($id)]} {
-		lappend ret $id
-	    }
-	    foreach a $arcnos($id) {
-		if {$archeads($a) ne {}} {
-		    validate_archeads $a
-		    if {$archeads($a) ne {}} {
-			set ret [concat $ret $archeads($a)]
-		    }
-		}
-		set d $arcstart($a)
-		if {![info exists seen($d)]} {
-		    lappend todo $d
-		    set seen($d) 1
-		}
-	    }
-	}
+        set id [lindex $todo $i]
+        if {[info exists cached_dheads($id)]} {
+            set ret [concat $ret $cached_dheads($id)]
+        } else {
+            if {[info exists idheads($id)]} {
+                lappend ret $id
+            }
+            foreach a $arcnos($id) {
+                if {$archeads($a) ne {}} {
+                    validate_archeads $a
+                    if {$archeads($a) ne {}} {
+                        set ret [concat $ret $archeads($a)]
+                    }
+                }
+                set d $arcstart($a)
+                if {![info exists seen($d)]} {
+                    lappend todo $d
+                    set seen($d) 1
+                }
+            }
+        }
     }
     set ret [lsort -unique $ret]
     set cached_dheads($origid) $ret
@@ -11204,7 +11222,7 @@
 
     if {![info exists arcnos($id)]} return
     if {![info exists arcout($id)]} {
-	recalcarc [lindex $arcnos($id) 0]
+        recalcarc [lindex $arcnos($id) 0]
     }
     unset -nocomplain cached_dtags
     unset -nocomplain cached_atags
@@ -11215,7 +11233,7 @@
 
     if {![info exists arcnos($hid)]} return
     if {![info exists arcout($hid)]} {
-	recalcarc [lindex $arcnos($hid) 0]
+        recalcarc [lindex $arcnos($hid) 0]
     }
     unset -nocomplain cached_dheads
 }
@@ -11231,7 +11249,7 @@
 
     if {![info exists arcnos($hid)]} return
     if {![info exists arcout($hid)]} {
-	recalcarc [lindex $arcnos($hid) 0]
+        recalcarc [lindex $arcnos($hid) 0]
     }
     unset -nocomplain cached_dheads
 }
@@ -11241,13 +11259,13 @@
     global arctags archeads arcnos arcout idheads idtags
 
     foreach id [concat [array names idheads] [array names idtags]] {
-	if {[info exists arcnos($id)] && ![info exists arcout($id)]} {
-	    set a [lindex $arcnos($id) 0]
-	    if {![info exists donearc($a)]} {
-		recalcarc $a
-		set donearc($a) 1
-	    }
-	}
+        if {[info exists arcnos($id)] && ![info exists arcout($id)]} {
+            set a [lindex $arcnos($id) 0]
+            if {![info exists donearc($a)]} {
+                recalcarc $a
+                set donearc($a) 1
+            }
+        }
     }
     unset -nocomplain cached_tagcontent
     unset -nocomplain cached_dtags
@@ -11259,26 +11277,26 @@
     global idtags idheads idotherrefs mainheadid
 
     set refids [concat [array names idtags] \
-		    [array names idheads] [array names idotherrefs]]
+                    [array names idheads] [array names idotherrefs]]
     foreach id $refids {
-	if {![info exists ref($id)]} {
-	    set ref($id) [listrefs $id]
-	}
+        if {![info exists ref($id)]} {
+            set ref($id) [listrefs $id]
+        }
     }
     set oldmainhead $mainheadid
     readrefs
     changedrefs
     set refids [lsort -unique [concat $refids [array names idtags] \
-			[array names idheads] [array names idotherrefs]]]
+                        [array names idheads] [array names idotherrefs]]]
     foreach id $refids {
-	set v [listrefs $id]
-	if {![info exists ref($id)] || $ref($id) != $v} {
-	    redrawtags $id
-	}
+        set v [listrefs $id]
+        if {![info exists ref($id)] || $ref($id) != $v} {
+            redrawtags $id
+        }
     }
     if {$oldmainhead ne $mainheadid} {
-	redrawtags $oldmainhead
-	redrawtags $mainheadid
+        redrawtags $oldmainhead
+        redrawtags $mainheadid
     }
     run refill_reflist
 }
@@ -11288,15 +11306,15 @@
 
     set x {}
     if {[info exists idtags($id)]} {
-	set x $idtags($id)
+        set x $idtags($id)
     }
     set y {}
     if {[info exists idheads($id)]} {
-	set y $idheads($id)
+        set y $idheads($id)
     }
     set z {}
     if {[info exists idotherrefs($id)]} {
-	set z $idotherrefs($id)
+        set z $idotherrefs($id)
     }
     return [list $x $y $z]
 }
@@ -11305,15 +11323,15 @@
     global ctext cached_tagcontent tagids
 
     if {![info exists cached_tagcontent($tag)]} {
-	catch {
-	    set cached_tagcontent($tag) [exec git cat-file -p $tag]
-	}
+        catch {
+            set cached_tagcontent($tag) [exec git cat-file -p $tag]
+        }
     }
     $ctext insert end "[mc "Tag"]: $tag\n" bold
     if {[info exists cached_tagcontent($tag)]} {
-	set text $cached_tagcontent($tag)
+        set text $cached_tagcontent($tag)
     } else {
-	set text "[mc "Id"]:  $tagids($tag)"
+        set text "[mc "Id"]:  $tagids($tag)"
     }
     appendwithlinks $text {}
 }
@@ -11322,7 +11340,7 @@
     global ctext cached_tagcontent tagids linknum tagobjid
 
     if {$isnew} {
-	addtohistory [list showtag $tag 0] savectextpos
+        addtohistory [list showtag $tag 0] savectextpos
     }
     $ctext conf -state normal
     clear_ctext
@@ -11338,7 +11356,7 @@
     global idtags ctext linknum
 
     if {$isnew} {
-	addtohistory [list showtags $id 0] savectextpos
+        addtohistory [list showtags $id 0] savectextpos
     }
     $ctext conf -state normal
     clear_ctext
@@ -11346,9 +11364,9 @@
     set linknum 0
     set sep {}
     foreach tag $idtags($id) {
-	$ctext insert end $sep
-	add_tag_ctext $tag
-	set sep "\n\n"
+        $ctext insert end $sep
+        add_tag_ctext $tag
+        set sep "\n\n"
     }
     maybe_scroll_ctext 1
     $ctext conf -state disabled
@@ -11364,7 +11382,7 @@
     destroy .
 
     if {[info exists gitktmpdir]} {
-	catch {file delete -force $gitktmpdir}
+        catch {file delete -force $gitktmpdir}
     }
 }
 
@@ -11373,9 +11391,9 @@
 
     set fontpref($font) [set $font]
     ${NS}::button $top.${font}but -text $which \
-	-command [list choosefont $font $which]
+        -command [list choosefont $font $which]
     ${NS}::label $top.$font -relief flat -font $font \
-	-text $fontattr($font,family) -justify left
+        -text $fontattr($font,family) -justify left
     grid x $top.${font}but $top.$font -sticky w
 }
 
@@ -11392,58 +11410,58 @@
     set top .gitkfont
     set fonttop $top
     if {![winfo exists $top]} {
-	font create sample
-	eval font config sample [font actual $font]
-	ttk_toplevel $top
-	make_transient $top $prefstop
-	wm title $top [mc "Gitk font chooser"]
-	${NS}::label $top.l -textvariable fontparam(which)
-	pack $top.l -side top
-	set fontlist [lsort [font families]]
-	${NS}::frame $top.f
-	listbox $top.f.fam -listvariable fontlist \
-	    -yscrollcommand [list $top.f.sb set]
-	bind $top.f.fam <<ListboxSelect>> selfontfam
-	${NS}::scrollbar $top.f.sb -command [list $top.f.fam yview]
-	pack $top.f.sb -side right -fill y
-	pack $top.f.fam -side left -fill both -expand 1
-	pack $top.f -side top -fill both -expand 1
-	${NS}::frame $top.g
-	spinbox $top.g.size -from 4 -to 40 -width 4 \
-	    -textvariable fontparam(size) \
-	    -validatecommand {string is integer -strict %s}
-	checkbutton $top.g.bold -padx 5 \
-	    -font {{Times New Roman} 12 bold} -text [mc "B"] -indicatoron 0 \
-	    -variable fontparam(weight) -onvalue bold -offvalue normal
-	checkbutton $top.g.ital -padx 5 \
-	    -font {{Times New Roman} 12 italic} -text [mc "I"] -indicatoron 0  \
-	    -variable fontparam(slant) -onvalue italic -offvalue roman
-	pack $top.g.size $top.g.bold $top.g.ital -side left
-	pack $top.g -side top
-	canvas $top.c -width 150 -height 50 -border 2 -relief sunk \
-	    -background white
-	$top.c create text 100 25 -anchor center -text $which -font sample \
-	    -fill black -tags text
-	bind $top.c <Configure> [list centertext $top.c]
-	pack $top.c -side top -fill x
-	${NS}::frame $top.buts
-	${NS}::button $top.buts.ok -text [mc "OK"] -command fontok -default active
-	${NS}::button $top.buts.can -text [mc "Cancel"] -command fontcan -default normal
-	bind $top <Key-Return> fontok
-	bind $top <Key-Escape> fontcan
-	grid $top.buts.ok $top.buts.can
-	grid columnconfigure $top.buts 0 -weight 1 -uniform a
-	grid columnconfigure $top.buts 1 -weight 1 -uniform a
-	pack $top.buts -side bottom -fill x
-	trace add variable fontparam write chg_fontparam
+        font create sample
+        eval font config sample [font actual $font]
+        ttk_toplevel $top
+        make_transient $top $prefstop
+        wm title $top [mc "Gitk font chooser"]
+        ${NS}::label $top.l -textvariable fontparam(which)
+        pack $top.l -side top
+        set fontlist [lsort [font families]]
+        ${NS}::frame $top.f
+        listbox $top.f.fam -listvariable fontlist \
+            -yscrollcommand [list $top.f.sb set]
+        bind $top.f.fam <<ListboxSelect>> selfontfam
+        ${NS}::scrollbar $top.f.sb -command [list $top.f.fam yview]
+        pack $top.f.sb -side right -fill y
+        pack $top.f.fam -side left -fill both -expand 1
+        pack $top.f -side top -fill both -expand 1
+        ${NS}::frame $top.g
+        spinbox $top.g.size -from 4 -to 40 -width 4 \
+            -textvariable fontparam(size) \
+            -validatecommand {string is integer -strict %s}
+        checkbutton $top.g.bold -padx 5 \
+            -font {{Times New Roman} 12 bold} -text [mc "B"] -indicatoron 0 \
+            -variable fontparam(weight) -onvalue bold -offvalue normal
+        checkbutton $top.g.ital -padx 5 \
+            -font {{Times New Roman} 12 italic} -text [mc "I"] -indicatoron 0  \
+            -variable fontparam(slant) -onvalue italic -offvalue roman
+        pack $top.g.size $top.g.bold $top.g.ital -side left
+        pack $top.g -side top
+        canvas $top.c -width 150 -height 50 -border 2 -relief sunk \
+            -background white
+        $top.c create text 100 25 -anchor center -text $which -font sample \
+            -fill black -tags text
+        bind $top.c <Configure> [list centertext $top.c]
+        pack $top.c -side top -fill x
+        ${NS}::frame $top.buts
+        ${NS}::button $top.buts.ok -text [mc "OK"] -command fontok -default active
+        ${NS}::button $top.buts.can -text [mc "Cancel"] -command fontcan -default normal
+        bind $top <Key-Return> fontok
+        bind $top <Key-Escape> fontcan
+        grid $top.buts.ok $top.buts.can
+        grid columnconfigure $top.buts 0 -weight 1 -uniform a
+        grid columnconfigure $top.buts 1 -weight 1 -uniform a
+        pack $top.buts -side bottom -fill x
+        trace add variable fontparam write chg_fontparam
     } else {
-	raise $top
-	$top.c itemconf text -text $which
+        raise $top
+        $top.c itemconf text -text $which
     }
     set i [lsearch -exact $fontlist $fontparam(family)]
     if {$i >= 0} {
-	$top.f.fam selection set $i
-	$top.f.fam see $i
+        $top.f.fam selection set $i
+        $top.f.fam see $i
     }
 }
 
@@ -11457,10 +11475,10 @@
     set f $fontparam(font)
     set fontpref($f) [list $fontparam(family) $fontparam(size)]
     if {$fontparam(weight) eq "bold"} {
-	lappend fontpref($f) "bold"
+        lappend fontpref($f) "bold"
     }
     if {$fontparam(slant) eq "italic"} {
-	lappend fontpref($f) "italic"
+        lappend fontpref($f) "italic"
     }
     set w $prefstop.notebook.fonts.$f
     $w conf -text $fontparam(family) -font $fontpref($f)
@@ -11472,10 +11490,10 @@
     global fonttop fontparam
 
     if {[info exists fonttop]} {
-	catch {destroy $fonttop}
-	catch {font delete sample}
-	unset fonttop
-	unset fontparam
+        catch {destroy $fonttop}
+        catch {font delete sample}
+        unset fonttop
+        unset fontparam
     }
 }
 
@@ -11483,21 +11501,21 @@
     # In Tk 8.6 we have a native font chooser dialog. Overwrite the above
     # function to make use of it.
     proc choosefont {font which} {
-	tk fontchooser configure -title $which -font $font \
-	    -command [list on_choosefont $font $which]
-	tk fontchooser show
+        tk fontchooser configure -title $which -font $font \
+            -command [list on_choosefont $font $which]
+        tk fontchooser show
     }
     proc on_choosefont {font which newfont} {
-	global fontparam
-	puts stderr "$font $newfont"
-	array set f [font actual $newfont]
-	set fontparam(which) $which
-	set fontparam(font) $font
-	set fontparam(family) $f(-family)
-	set fontparam(size) $f(-size)
-	set fontparam(weight) $f(-weight)
-	set fontparam(slant) $f(-slant)
-	fontok
+        global fontparam
+        puts stderr "$font $newfont"
+        array set f [font actual $newfont]
+        set fontparam(which) $which
+        set fontparam(font) $font
+        set fontparam(family) $f(-family)
+        set fontparam(size) $f(-size)
+        set fontparam(weight) $f(-weight)
+        set fontparam(slant) $f(-slant)
+        fontok
     }
 }
 
@@ -11506,7 +11524,7 @@
 
     set i [$fonttop.f.fam curselection]
     if {$i ne {}} {
-	set fontparam(family) [$fonttop.f.fam get $i]
+        set fontparam(family) [$fonttop.f.fam get $i]
     }
 }
 
@@ -11521,9 +11539,9 @@
     global NS
     set parent [join [lrange [split $w .] 0 end-1] .]
     if {[winfo class $parent] eq "TNotebook"} {
-	${NS}::frame $w
+        ${NS}::frame $w
     } else {
-	${NS}::labelframe $w
+        ${NS}::labelframe $w
     }
 }
 
@@ -11545,14 +11563,14 @@
     spinbox $page.maxpct -from 1 -to 100 -width 4 -textvariable maxgraphpct
     grid x $page.maxpctl $page.maxpct -sticky w
     ${NS}::checkbutton $page.showlocal -text [mc "Show local changes"] \
-	-variable showlocalchanges
+        -variable showlocalchanges
     grid x $page.showlocal -sticky w
     ${NS}::checkbutton $page.autoselect -text [mc "Auto-select SHA1 (length)"] \
-	-variable autoselect
+        -variable autoselect
     spinbox $page.autosellen -from 1 -to 40 -width 4 -textvariable autosellen
     grid x $page.autoselect $page.autosellen -sticky w
     ${NS}::checkbutton $page.hideremotes -text [mc "Hide remote refs"] \
-	-variable hideremotes
+        -variable hideremotes
     grid x $page.hideremotes -sticky w
 
     ${NS}::label $page.ddisp -text [mc "Diff display options"]
@@ -11561,16 +11579,16 @@
     spinbox $page.tabstop -from 1 -to 20 -width 4 -textvariable tabstop
     grid x $page.tabstopl $page.tabstop -sticky w
     ${NS}::checkbutton $page.ntag -text [mc "Display nearby tags/heads"] \
-	-variable showneartags
+        -variable showneartags
     grid x $page.ntag -sticky w
     ${NS}::label $page.maxrefsl -text [mc "Maximum # tags/heads to show"]
     spinbox $page.maxrefs -from 1 -to 1000 -width 4 -textvariable maxrefs
     grid x $page.maxrefsl $page.maxrefs -sticky w
     ${NS}::checkbutton $page.ldiff -text [mc "Limit diffs to listed paths"] \
-	-variable limitdiffs
+        -variable limitdiffs
     grid x $page.ldiff -sticky w
     ${NS}::checkbutton $page.lattr -text [mc "Support per-file encodings"] \
-	-variable perfile_attrs
+        -variable perfile_attrs
     grid x $page.lattr -sticky w
 
     ${NS}::entry $page.extdifft -textvariable extdifftool
@@ -11591,11 +11609,11 @@
     ${NS}::label $page.lgen -text [mc "General options"]
     grid $page.lgen - -sticky w -pady 10
     ${NS}::checkbutton $page.want_ttk -variable want_ttk \
-	-text [mc "Use themed widgets"]
+        -text [mc "Use themed widgets"]
     if {$have_ttk} {
-	${NS}::label $page.ttk_note -text [mc "(change requires restart)"]
+        ${NS}::label $page.ttk_note -text [mc "(change requires restart)"]
     } else {
-	${NS}::label $page.ttk_note -text [mc "(currently unavailable)"]
+        ${NS}::label $page.ttk_note -text [mc "(currently unavailable)"]
     }
     grid x $page.want_ttk $page.ttk_note -sticky w
     return $page
@@ -11603,6 +11621,7 @@
 
 proc prefspage_colors {notebook} {
     global NS uicolor bgcolor fgcolor ctext diffcolors selectbgcolor markbgcolor
+    global diffbgcolors
 
     set page [create_prefs_page $notebook.colors]
 
@@ -11614,37 +11633,49 @@
     grid x $page.uibut $page.ui -sticky w
     label $page.bg -padx 40 -relief sunk -background $bgcolor
     ${NS}::button $page.bgbut -text [mc "Background"] \
-	-command [list choosecolor bgcolor {} $page.bg [mc "background"] setbg]
+        -command [list choosecolor bgcolor {} $page.bg [mc "background"] setbg]
     grid x $page.bgbut $page.bg -sticky w
     label $page.fg -padx 40 -relief sunk -background $fgcolor
     ${NS}::button $page.fgbut -text [mc "Foreground"] \
-	-command [list choosecolor fgcolor {} $page.fg [mc "foreground"] setfg]
+        -command [list choosecolor fgcolor {} $page.fg [mc "foreground"] setfg]
     grid x $page.fgbut $page.fg -sticky w
     label $page.diffold -padx 40 -relief sunk -background [lindex $diffcolors 0]
     ${NS}::button $page.diffoldbut -text [mc "Diff: old lines"] \
-	-command [list choosecolor diffcolors 0 $page.diffold [mc "diff old lines"] \
-		      [list $ctext tag conf d0 -foreground]]
+        -command [list choosecolor diffcolors 0 $page.diffold [mc "diff old lines"] \
+                      [list $ctext tag conf d0 -foreground]]
     grid x $page.diffoldbut $page.diffold -sticky w
+    label $page.diffoldbg -padx 40 -relief sunk -background [lindex $diffbgcolors 0]
+    ${NS}::button $page.diffoldbgbut -text [mc "Diff: old lines bg"] \
+        -command [list choosecolor diffbgcolors 0 $page.diffoldbg \
+                      [mc "diff old lines bg"] \
+                      [list $ctext tag conf d0 -background]]
+    grid x $page.diffoldbgbut $page.diffoldbg -sticky w
     label $page.diffnew -padx 40 -relief sunk -background [lindex $diffcolors 1]
     ${NS}::button $page.diffnewbut -text [mc "Diff: new lines"] \
-	-command [list choosecolor diffcolors 1 $page.diffnew [mc "diff new lines"] \
-		      [list $ctext tag conf dresult -foreground]]
+        -command [list choosecolor diffcolors 1 $page.diffnew [mc "diff new lines"] \
+                      [list $ctext tag conf dresult -foreground]]
     grid x $page.diffnewbut $page.diffnew -sticky w
+    label $page.diffnewbg -padx 40 -relief sunk -background [lindex $diffbgcolors 1]
+    ${NS}::button $page.diffnewbgbut -text [mc "Diff: new lines bg"] \
+        -command [list choosecolor diffbgcolors 1 $page.diffnewbg \
+                      [mc "diff new lines bg"] \
+                      [list $ctext tag conf dresult -background]]
+    grid x $page.diffnewbgbut $page.diffnewbg -sticky w
     label $page.hunksep -padx 40 -relief sunk -background [lindex $diffcolors 2]
     ${NS}::button $page.hunksepbut -text [mc "Diff: hunk header"] \
-	-command [list choosecolor diffcolors 2 $page.hunksep \
-		      [mc "diff hunk header"] \
-		      [list $ctext tag conf hunksep -foreground]]
+        -command [list choosecolor diffcolors 2 $page.hunksep \
+                      [mc "diff hunk header"] \
+                      [list $ctext tag conf hunksep -foreground]]
     grid x $page.hunksepbut $page.hunksep -sticky w
     label $page.markbgsep -padx 40 -relief sunk -background $markbgcolor
     ${NS}::button $page.markbgbut -text [mc "Marked line bg"] \
-	-command [list choosecolor markbgcolor {} $page.markbgsep \
-		      [mc "marked line background"] \
-		      [list $ctext tag conf omark -background]]
+        -command [list choosecolor markbgcolor {} $page.markbgsep \
+                      [mc "marked line background"] \
+                      [list $ctext tag conf omark -background]]
     grid x $page.markbgbut $page.markbgsep -sticky w
     label $page.selbgsep -padx 40 -relief sunk -background $selectbgcolor
     ${NS}::button $page.selbgbut -text [mc "Select bg"] \
-	-command [list choosecolor selectbgcolor {} $page.selbgsep [mc "background"] setselbg]
+        -command [list choosecolor selectbgcolor {} $page.selbgsep [mc "background"] setselbg]
     grid x $page.selbgbut $page.selbgsep -sticky w
     return $page
 }
@@ -11670,21 +11701,21 @@
     set top .gitkprefs
     set prefstop $top
     if {[winfo exists $top]} {
-	raise $top
-	return
+        raise $top
+        return
     }
     foreach v {maxwidth maxgraphpct showneartags showlocalchanges \
-		   limitdiffs tabstop perfile_attrs hideremotes want_ttk} {
-	set oldprefs($v) [set $v]
+                   limitdiffs tabstop perfile_attrs hideremotes want_ttk} {
+        set oldprefs($v) [set $v]
     }
     ttk_toplevel $top
     wm title $top [mc "Gitk preferences"]
     make_transient $top .
 
     if {[set use_notebook [expr {$use_ttk && [info command ::ttk::notebook] ne ""}]]} {
-	set notebook [ttk::notebook $top.notebook]
+        set notebook [ttk::notebook $top.notebook]
     } else {
-	set notebook [${NS}::frame $top.notebook -borderwidth 0 -relief flat]
+        set notebook [${NS}::frame $top.notebook -borderwidth 0 -relief flat]
     }
 
     lappend pages [prefspage_general $notebook] [mc "General"]
@@ -11692,21 +11723,21 @@
     lappend pages [prefspage_fonts $notebook] [mc "Fonts"]
     set col 0
     foreach {page title} $pages {
-	if {$use_notebook} {
-	    $notebook add $page -text $title
-	} else {
-	    set btn [${NS}::button $notebook.b_[string map {. X} $page] \
-			 -text $title -command [list raise $page]]
-	    $page configure -text $title
-	    grid $btn -row 0 -column [incr col] -sticky w
-	    grid $page -row 1 -column 0 -sticky news -columnspan 100
-	}
+        if {$use_notebook} {
+            $notebook add $page -text $title
+        } else {
+            set btn [${NS}::button $notebook.b_[string map {. X} $page] \
+                         -text $title -command [list raise $page]]
+            $page configure -text $title
+            grid $btn -row 0 -column [incr col] -sticky w
+            grid $page -row 1 -column 0 -sticky news -columnspan 100
+        }
     }
 
     if {!$use_notebook} {
-	grid columnconfigure $notebook 0 -weight 1
-	grid rowconfigure $notebook 1 -weight 1
-	raise [lindex $pages 0]
+        grid columnconfigure $notebook 0 -weight 1
+        grid rowconfigure $notebook 1 -weight 1
+        raise [lindex $pages 0]
     }
 
     grid $notebook -sticky news -padx 2 -pady 2
@@ -11731,7 +11762,7 @@
 
     set prog [tk_getOpenFile -title [mc "External diff tool"] -multiple false]
     if {$prog ne {}} {
-	set extdifftool $prog
+        set extdifftool $prog
     }
 }
 
@@ -11739,7 +11770,7 @@
     global $v
 
     set c [tk_chooseColor -initialcolor [lindex [set $v] $vi] \
-	       -title [mc "Gitk: choose color for %s" $x]]
+               -title [mc "Gitk: choose color for %s" $x]]
     if {$c eq {}} return
     $w conf -background $c
     lset $v $vi $c
@@ -11749,12 +11780,12 @@
 proc setselbg {c} {
     global bglist cflist
     foreach w $bglist {
-	if {[winfo exists $w]} {
-	    $w configure -selectbackground $c
-	}
+        if {[winfo exists $w]} {
+            $w configure -selectbackground $c
+        }
     }
     $cflist tag configure highlight \
-	-background [$cflist cget -selectbackground]
+        -background [$cflist cget -selectbackground]
     allcanvs itemconf secsel -fill $c
 }
 
@@ -11768,7 +11799,7 @@
     set bg [winfo rgb . $c]
     set selc black
     if {[lindex $bg 0] + 1.5 * [lindex $bg 1] + 0.5 * [lindex $bg 2] > 100000} {
-	set selc white
+        set selc white
     }
     tk_setPalette background $c selectColor $selc
 }
@@ -11777,9 +11808,9 @@
     global bglist
 
     foreach w $bglist {
-	if {[winfo exists $w]} {
-	    $w conf -background $c
-	}
+        if {[winfo exists $w]} {
+            $w conf -background $c
+        }
     }
 }
 
@@ -11787,9 +11818,9 @@
     global fglist canv
 
     foreach w $fglist {
-	if {[winfo exists $w]} {
-	    $w conf -foreground $c
-	}
+        if {[winfo exists $w]} {
+            $w conf -foreground $c
+        }
     }
     allcanvs itemconf text -fill $c
     $canv itemconf circle -outline $c
@@ -11800,9 +11831,9 @@
     global oldprefs prefstop
 
     foreach v {maxwidth maxgraphpct showneartags showlocalchanges \
-		   limitdiffs tabstop perfile_attrs hideremotes want_ttk} {
-	global $v
-	set $v $oldprefs($v)
+                   limitdiffs tabstop perfile_attrs hideremotes want_ttk} {
+        global $v
+        set $v $oldprefs($v)
     }
     catch {destroy $prefstop}
     unset prefstop
@@ -11821,76 +11852,76 @@
     fontcan
     set fontchanged 0
     if {$mainfont ne $fontpref(mainfont)} {
-	set mainfont $fontpref(mainfont)
-	parsefont mainfont $mainfont
-	eval font configure mainfont [fontflags mainfont]
-	eval font configure mainfontbold [fontflags mainfont 1]
-	setcoords
-	set fontchanged 1
+        set mainfont $fontpref(mainfont)
+        parsefont mainfont $mainfont
+        eval font configure mainfont [fontflags mainfont]
+        eval font configure mainfontbold [fontflags mainfont 1]
+        setcoords
+        set fontchanged 1
     }
     if {$textfont ne $fontpref(textfont)} {
-	set textfont $fontpref(textfont)
-	parsefont textfont $textfont
-	eval font configure textfont [fontflags textfont]
-	eval font configure textfontbold [fontflags textfont 1]
+        set textfont $fontpref(textfont)
+        parsefont textfont $textfont
+        eval font configure textfont [fontflags textfont]
+        eval font configure textfontbold [fontflags textfont 1]
     }
     if {$uifont ne $fontpref(uifont)} {
-	set uifont $fontpref(uifont)
-	parsefont uifont $uifont
-	eval font configure uifont [fontflags uifont]
+        set uifont $fontpref(uifont)
+        parsefont uifont $uifont
+        eval font configure uifont [fontflags uifont]
     }
     settabs
     if {$showlocalchanges != $oldprefs(showlocalchanges)} {
-	if {$showlocalchanges} {
-	    doshowlocalchanges
-	} else {
-	    dohidelocalchanges
-	}
+        if {$showlocalchanges} {
+            doshowlocalchanges
+        } else {
+            dohidelocalchanges
+        }
     }
     if {$limitdiffs != $oldprefs(limitdiffs) ||
-	($perfile_attrs && !$oldprefs(perfile_attrs))} {
-	# treediffs elements are limited by path;
-	# won't have encodings cached if perfile_attrs was just turned on
-	unset -nocomplain treediffs
+        ($perfile_attrs && !$oldprefs(perfile_attrs))} {
+        # treediffs elements are limited by path;
+        # won't have encodings cached if perfile_attrs was just turned on
+        unset -nocomplain treediffs
     }
     if {$fontchanged || $maxwidth != $oldprefs(maxwidth)
-	|| $maxgraphpct != $oldprefs(maxgraphpct)} {
-	redisplay
+        || $maxgraphpct != $oldprefs(maxgraphpct)} {
+        redisplay
     } elseif {$showneartags != $oldprefs(showneartags) ||
-	  $limitdiffs != $oldprefs(limitdiffs)} {
-	reselectline
+          $limitdiffs != $oldprefs(limitdiffs)} {
+        reselectline
     }
     if {$hideremotes != $oldprefs(hideremotes)} {
-	rereadrefs
+        rereadrefs
     }
 }
 
 proc formatdate {d} {
     global datetimeformat
     if {$d ne {}} {
-	# If $datetimeformat includes a timezone, display in the
-	# timezone of the argument.  Otherwise, display in local time.
-	if {[string match {*%[zZ]*} $datetimeformat]} {
-	    if {[catch {set d [clock format [lindex $d 0] -timezone [lindex $d 1] -format $datetimeformat]}]} {
-		# Tcl < 8.5 does not support -timezone.  Emulate it by
-		# setting TZ (e.g. TZ=<-0430>+04:30).
-		global env
-		if {[info exists env(TZ)]} {
-		    set savedTZ $env(TZ)
-		}
-		set zone [lindex $d 1]
-		set sign [string map {+ - - +} [string index $zone 0]]
-		set env(TZ) <$zone>$sign[string range $zone 1 2]:[string range $zone 3 4]
-		set d [clock format [lindex $d 0] -format $datetimeformat]
-		if {[info exists savedTZ]} {
-		    set env(TZ) $savedTZ
-		} else {
-		    unset env(TZ)
-		}
-	    }
-	} else {
-	    set d [clock format [lindex $d 0] -format $datetimeformat]
-	}
+        # If $datetimeformat includes a timezone, display in the
+        # timezone of the argument.  Otherwise, display in local time.
+        if {[string match {*%[zZ]*} $datetimeformat]} {
+            if {[catch {set d [clock format [lindex $d 0] -timezone [lindex $d 1] -format $datetimeformat]}]} {
+                # Tcl < 8.5 does not support -timezone.  Emulate it by
+                # setting TZ (e.g. TZ=<-0430>+04:30).
+                global env
+                if {[info exists env(TZ)]} {
+                    set savedTZ $env(TZ)
+                }
+                set zone [lindex $d 1]
+                set sign [string map {+ - - +} [string index $zone 0]]
+                set env(TZ) <$zone>$sign[string range $zone 1 2]:[string range $zone 3 4]
+                set d [clock format [lindex $d 0] -format $datetimeformat]
+                if {[info exists savedTZ]} {
+                    set env(TZ) $savedTZ
+                } else {
+                    unset env(TZ)
+                }
+            }
+        } else {
+            set d [clock format [lindex $d 0] -format $datetimeformat]
+        }
     }
     return $d
 }
@@ -12136,38 +12167,38 @@
 proc tcl_encoding {enc} {
     global encoding_aliases tcl_encoding_cache
     if {[info exists tcl_encoding_cache($enc)]} {
-	return $tcl_encoding_cache($enc)
+        return $tcl_encoding_cache($enc)
     }
     set names [encoding names]
     set lcnames [string tolower $names]
     set enc [string tolower $enc]
     set i [lsearch -exact $lcnames $enc]
     if {$i < 0} {
-	# look for "isonnn" instead of "iso-nnn" or "iso_nnn"
-	if {[regsub {^(iso|cp|ibm|jis)[-_]} $enc {\1} encx]} {
-	    set i [lsearch -exact $lcnames $encx]
-	}
+        # look for "isonnn" instead of "iso-nnn" or "iso_nnn"
+        if {[regsub {^(iso|cp|ibm|jis)[-_]} $enc {\1} encx]} {
+            set i [lsearch -exact $lcnames $encx]
+        }
     }
     if {$i < 0} {
-	foreach l $encoding_aliases {
-	    set ll [string tolower $l]
-	    if {[lsearch -exact $ll $enc] < 0} continue
-	    # look through the aliases for one that tcl knows about
-	    foreach e $ll {
-		set i [lsearch -exact $lcnames $e]
-		if {$i < 0} {
-		    if {[regsub {^(iso|cp|ibm|jis)[-_]} $e {\1} ex]} {
-			set i [lsearch -exact $lcnames $ex]
-		    }
-		}
-		if {$i >= 0} break
-	    }
-	    break
-	}
+        foreach l $encoding_aliases {
+            set ll [string tolower $l]
+            if {[lsearch -exact $ll $enc] < 0} continue
+            # look through the aliases for one that tcl knows about
+            foreach e $ll {
+                set i [lsearch -exact $lcnames $e]
+                if {$i < 0} {
+                    if {[regsub {^(iso|cp|ibm|jis)[-_]} $e {\1} ex]} {
+                        set i [lsearch -exact $lcnames $ex]
+                    }
+                }
+                if {$i >= 0} break
+            }
+            break
+        }
     }
     set tclenc {}
     if {$i >= 0} {
-	set tclenc [lindex $names $i]
+        set tclenc [lindex $names $i]
     }
     set tcl_encoding_cache($enc) $tclenc
     return $tclenc
@@ -12176,16 +12207,16 @@
 proc gitattr {path attr default} {
     global path_attr_cache
     if {[info exists path_attr_cache($attr,$path)]} {
-	set r $path_attr_cache($attr,$path)
+        set r $path_attr_cache($attr,$path)
     } else {
-	set r "unspecified"
-	if {![catch {set line [exec git check-attr $attr -- $path]}]} {
-	    regexp "(.*): $attr: (.*)" $line m f r
-	}
-	set path_attr_cache($attr,$path) $r
+        set r "unspecified"
+        if {![catch {set line [exec git check-attr $attr -- $path]}]} {
+            regexp "(.*): $attr: (.*)" $line m f r
+        }
+        set path_attr_cache($attr,$path) $r
     }
     if {$r eq "unspecified"} {
-	return $default
+        return $default
     }
     return $r
 }
@@ -12194,28 +12225,28 @@
     global path_attr_cache
     set newlist {}
     foreach path $pathlist {
-	if {![info exists path_attr_cache($attr,$path)]} {
-	    lappend newlist $path
-	}
+        if {![info exists path_attr_cache($attr,$path)]} {
+            lappend newlist $path
+        }
     }
     set lim 1000
     if {[tk windowingsystem] == "win32"} {
-	# windows has a 32k limit on the arguments to a command...
-	set lim 30
+        # windows has a 32k limit on the arguments to a command...
+        set lim 30
     }
     while {$newlist ne {}} {
-	set head [lrange $newlist 0 [expr {$lim - 1}]]
-	set newlist [lrange $newlist $lim end]
-	if {![catch {set rlist [eval exec git check-attr $attr -- $head]}]} {
-	    foreach row [split $rlist "\n"] {
-		if {[regexp "(.*): $attr: (.*)" $row m path value]} {
-		    if {[string index $path 0] eq "\""} {
-			set path [encoding convertfrom [lindex $path 0]]
-		    }
-		    set path_attr_cache($attr,$path) $value
-		}
-	    }
-	}
+        set head [lrange $newlist 0 [expr {$lim - 1}]]
+        set newlist [lrange $newlist $lim end]
+        if {![catch {set rlist [eval exec git check-attr $attr -- $head]}]} {
+            foreach row [split $rlist "\n"] {
+                if {[regexp "(.*): $attr: (.*)" $row m path value]} {
+                    if {[string index $path 0] eq "\""} {
+                        set path [encoding convertfrom [lindex $path 0]]
+                    }
+                    set path_attr_cache($attr,$path) $value
+                }
+            }
+        }
     }
 }
 
@@ -12223,10 +12254,10 @@
     global gui_encoding perfile_attrs
     set tcl_enc $gui_encoding
     if {$path ne {} && $perfile_attrs} {
-	set enc2 [tcl_encoding [gitattr $path encoding $tcl_enc]]
-	if {$enc2 ne {}} {
-	    set tcl_enc $enc2
-	}
+        set enc2 [tcl_encoding [gitattr $path encoding $tcl_enc]]
+        if {$enc2 ne {}} {
+            set tcl_enc $enc2
+        }
     }
     return $tcl_enc
 }
@@ -12253,7 +12284,7 @@
 # First check that Tcl/Tk is recent enough
 if {[catch {package require Tk 8.4} err]} {
     show_error {} . [mc "Sorry, gitk cannot run with this version of Tcl/Tk.\n\
-			 Gitk requires at least Tcl/Tk 8.4."]
+                         Gitk requires at least Tcl/Tk 8.4."]
     exit 1
 }
 
@@ -12293,12 +12324,12 @@
 catch {
     set enc [exec git config --get gui.encoding]
     if {$enc ne {}} {
-	set tclenc [tcl_encoding $enc]
-	if {$tclenc ne {}} {
-	    set gui_encoding $tclenc
-	} else {
-	    puts stderr "Warning: encoding $enc is not supported by Tcl/Tk"
-	}
+        set tclenc [tcl_encoding $enc]
+        if {$tclenc ne {}} {
+            set gui_encoding $tclenc
+        } else {
+            puts stderr "Warning: encoding $enc is not supported by Tcl/Tk"
+        }
     }
 }
 
@@ -12368,12 +12399,13 @@
     set fgcolor black
     set selectbgcolor gray85
     if {[tk windowingsystem] eq "aqua"} {
-	set web_browser "open"
+        set web_browser "open"
     } else {
-	set web_browser "xdg-open"
+        set web_browser "xdg-open"
     }
 }
-set diffcolors {red "#00a000" blue}
+set diffcolors {"#c30000" "#009800" blue}
+set diffbgcolors {"#fff3f3" "#f0fff0"}
 set diffcontext 3
 set mergecolors {red blue "#00ff00" purple brown "#009090" magenta "#808000" "#009000" "#ff0080" cyan "#b07070" "#70b0f0" "#70f0b0" "#f0b070" "#ff70b0"}
 set ignorespace 0
@@ -12413,22 +12445,22 @@
     # follow the XDG base directory specification by default. See
     # http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
     if {[info exists env(XDG_CONFIG_HOME)] && $env(XDG_CONFIG_HOME) ne ""} {
-	# XDG_CONFIG_HOME environment variable is set
-	set config_file [file join $env(XDG_CONFIG_HOME) git gitk]
-	set config_file_tmp [file join $env(XDG_CONFIG_HOME) git gitk-tmp]
+        # XDG_CONFIG_HOME environment variable is set
+        set config_file [file join $env(XDG_CONFIG_HOME) git gitk]
+        set config_file_tmp [file join $env(XDG_CONFIG_HOME) git gitk-tmp]
     } else {
-	# default XDG_CONFIG_HOME
-	set config_file "~/.config/git/gitk"
-	set config_file_tmp "~/.config/git/gitk-tmp"
+        # default XDG_CONFIG_HOME
+        set config_file "~/.config/git/gitk"
+        set config_file_tmp "~/.config/git/gitk-tmp"
     }
     if {![file exists $config_file]} {
-	# for backward compatibility use the old config file if it exists
-	if {[file exists "~/.gitk"]} {
-	    set config_file "~/.gitk"
-	    set config_file_tmp "~/.gitk-tmp"
-	} elseif {![file exists [file dirname $config_file]]} {
-	    file mkdir [file dirname $config_file]
-	}
+        # for backward compatibility use the old config file if it exists
+        if {[file exists "~/.gitk"]} {
+            set config_file "~/.gitk"
+            set config_file_tmp "~/.gitk-tmp"
+        } elseif {![file exists [file dirname $config_file]]} {
+            file mkdir [file dirname $config_file]
+        }
     }
     source $config_file
 }
@@ -12444,7 +12476,7 @@
     remotebgcolor tagbgcolor tagfgcolor tagoutlinecolor reflinecolor
     filesepbgcolor filesepfgcolor linehoverbgcolor linehoverfgcolor
     linehoveroutlinecolor mainheadcirclecolor workingfilescirclecolor
-    indexcirclecolor circlecolors linkfgcolor circleoutlinecolor
+    indexcirclecolor circlecolors linkfgcolor circleoutlinecolor diffbgcolors
     web_browser
 }
 foreach var $config_variables {
@@ -12482,20 +12514,20 @@
 set revtreeargscmd {}
 foreach arg $argv {
     switch -glob -- $arg {
-	"" { }
-	"--" {
-	    set cmdline_files [lrange $argv [expr {$i + 1}] end]
-	    break
-	}
-	"--select-commit=*" {
-	    set selecthead [string range $arg 16 end]
-	}
-	"--argscmd=*" {
-	    set revtreeargscmd [string range $arg 10 end]
-	}
-	default {
-	    lappend revtreeargs $arg
-	}
+        "" { }
+        "--" {
+            set cmdline_files [lrange $argv [expr {$i + 1}] end]
+            break
+        }
+        "--select-commit=*" {
+            set selecthead [string range $arg 16 end]
+        }
+        "--argscmd=*" {
+            set revtreeargscmd [string range $arg 10 end]
+        }
+        default {
+            lappend revtreeargs $arg
+        }
     }
     incr i
 }
@@ -12507,29 +12539,29 @@
 if {$i >= [llength $argv] && $revtreeargs ne {}} {
     # no -- on command line, but some arguments (other than --argscmd)
     if {[catch {
-	set f [eval exec git rev-parse --no-revs --no-flags $revtreeargs]
-	set cmdline_files [split $f "\n"]
-	set n [llength $cmdline_files]
-	set revtreeargs [lrange $revtreeargs 0 end-$n]
-	# Unfortunately git rev-parse doesn't produce an error when
-	# something is both a revision and a filename.  To be consistent
-	# with git log and git rev-list, check revtreeargs for filenames.
-	foreach arg $revtreeargs {
-	    if {[file exists $arg]} {
-		show_error {} . [mc "Ambiguous argument '%s': both revision\
-				 and filename" $arg]
-		exit 1
-	    }
-	}
+        set f [eval exec git rev-parse --no-revs --no-flags $revtreeargs]
+        set cmdline_files [split $f "\n"]
+        set n [llength $cmdline_files]
+        set revtreeargs [lrange $revtreeargs 0 end-$n]
+        # Unfortunately git rev-parse doesn't produce an error when
+        # something is both a revision and a filename.  To be consistent
+        # with git log and git rev-list, check revtreeargs for filenames.
+        foreach arg $revtreeargs {
+            if {[file exists $arg]} {
+                show_error {} . [mc "Ambiguous argument '%s': both revision\
+                                 and filename" $arg]
+                exit 1
+            }
+        }
     } err]} {
-	# unfortunately we get both stdout and stderr in $err,
-	# so look for "fatal:".
-	set i [string first "fatal:" $err]
-	if {$i > 0} {
-	    set err [string range $err [expr {$i + 6}] end]
-	}
-	show_error {} . "[mc "Bad arguments to gitk:"]\n$err"
-	exit 1
+        # unfortunately we get both stdout and stderr in $err,
+        # so look for "fatal:".
+        set i [string first "fatal:" $err]
+        if {$i > 0} {
+            set err [string range $err [expr {$i + 6}] end]
+        }
+        show_error {} . "[mc "Bad arguments to gitk:"]\n$err"
+        exit 1
     }
 }
 
@@ -12599,7 +12631,7 @@
 if {[expr {[exec git rev-parse --is-inside-work-tree] == "true"}]} {
     set cdup [exec git rev-parse --show-cdup]
 }
-set worktree [exec git rev-parse --show-toplevel]
+set worktree [gitworktree]
 setcoords
 makewindow
 catch {
@@ -12650,15 +12682,15 @@
 
 if {[info exists permviews]} {
     foreach v $permviews {
-	set n $nextviewnum
-	incr nextviewnum
-	set viewname($n) [lindex $v 0]
-	set viewfiles($n) [lindex $v 1]
-	set viewargs($n) [lindex $v 2]
-	set viewargscmd($n) [lindex $v 3]
-	set viewperm($n) 1
-	set viewchanged($n) 0
-	addviewmenu $n
+        set n $nextviewnum
+        incr nextviewnum
+        set viewname($n) [lindex $v 0]
+        set viewfiles($n) [lindex $v 1]
+        set viewargs($n) [lindex $v 2]
+        set viewargscmd($n) [lindex $v 3]
+        set viewperm($n) 1
+        set viewchanged($n) 0
+        addviewmenu $n
     }
 }
 
diff --git a/interdiff.c b/interdiff.c
deleted file mode 100644
index c81d680..0000000
--- a/interdiff.c
+++ /dev/null
@@ -1,28 +0,0 @@
-#include "cache.h"
-#include "commit.h"
-#include "revision.h"
-#include "interdiff.h"
-
-static struct strbuf *idiff_prefix_cb(struct diff_options *opt, void *data)
-{
-	return data;
-}
-
-void show_interdiff(struct rev_info *rev, int indent)
-{
-	struct diff_options opts;
-	struct strbuf prefix = STRBUF_INIT;
-
-	memcpy(&opts, &rev->diffopt, sizeof(opts));
-	opts.output_format = DIFF_FORMAT_PATCH;
-	opts.output_prefix = idiff_prefix_cb;
-	strbuf_addchars(&prefix, ' ', indent);
-	opts.output_prefix_data = &prefix;
-	diff_setup_done(&opts);
-
-	diff_tree_oid(rev->idiff_oid1, rev->idiff_oid2, "", &opts);
-	diffcore_std(&opts);
-	diff_flush(&opts);
-
-	strbuf_release(&prefix);
-}
diff --git a/interdiff.h b/interdiff.h
deleted file mode 100644
index 01c730a..0000000
--- a/interdiff.h
+++ /dev/null
@@ -1,8 +0,0 @@
-#ifndef INTERDIFF_H
-#define INTERDIFF_H
-
-struct rev_info;
-
-void show_interdiff(struct rev_info *, int indent);
-
-#endif
diff --git a/line-log.c b/line-log.c
index bf73ea9..68eeb42 100644
--- a/line-log.c
+++ b/line-log.c
@@ -1159,7 +1159,7 @@
 		return 1;
 
 	if (!rev->bloom_filter_settings ||
-	    !(filter = get_bloom_filter(rev->repo, commit, 0)))
+	    !(filter = get_bloom_filter(rev->repo, commit)))
 		return 1;
 
 	if (!range)
diff --git a/log-tree.c b/log-tree.c
index 8ac285a..cb8942f 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -15,7 +15,6 @@
 #include "sequencer.h"
 #include "line-log.h"
 #include "help.h"
-#include "interdiff.h"
 #include "range-diff.h"
 
 static struct decoration name_decoration = { "object names" };
@@ -800,7 +799,8 @@
 
 		next_commentary_block(opt, NULL);
 		fprintf_ln(opt->diffopt.file, "%s", opt->idiff_title);
-		show_interdiff(opt, 2);
+		show_interdiff(opt->idiff_oid1, opt->idiff_oid2, 2,
+			       &opt->diffopt);
 
 		memcpy(&diff_queued_diff, &dq, sizeof(diff_queued_diff));
 	}
diff --git a/mergetools/meld b/mergetools/meld
index 7a08470..aab4ebb 100644
--- a/mergetools/meld
+++ b/mergetools/meld
@@ -3,34 +3,87 @@
 }
 
 merge_cmd () {
-	if test -z "${meld_has_output_option:+set}"
+	check_meld_for_features
+
+	option_auto_merge=
+	if test "$meld_use_auto_merge_option" = true
 	then
-		check_meld_for_output_version
+		option_auto_merge="--auto-merge"
 	fi
 
 	if test "$meld_has_output_option" = true
 	then
-		"$merge_tool_path" --output="$MERGED" \
+		"$merge_tool_path" $option_auto_merge --output="$MERGED" \
 			"$LOCAL" "$BASE" "$REMOTE"
 	else
-		"$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
+		"$merge_tool_path" $option_auto_merge "$LOCAL" "$MERGED" "$REMOTE"
 	fi
 }
 
-# Check whether we should use 'meld --output <file>'
-check_meld_for_output_version () {
-	meld_path="$(git config mergetool.meld.path)"
-	meld_path="${meld_path:-meld}"
+# Get meld help message
+init_meld_help_msg () {
+	if test -z "$meld_help_msg"
+	then
+		meld_path="$(git config mergetool.meld.path || echo meld)"
+		meld_help_msg=$("$meld_path" --help 2>&1)
+	fi
+}
 
-	if meld_has_output_option=$(git config --bool mergetool.meld.hasOutput)
+# Check the features and set flags
+check_meld_for_features () {
+	# Check whether we should use 'meld --output <file>'
+	if test -z "$meld_has_output_option"
 	then
-		: use configured value
-	elif "$meld_path" --help 2>&1 |
-		grep -e '--output=' -e '\[OPTION\.\.\.\]' >/dev/null
+		meld_has_output_option=$(git config --bool mergetool.meld.hasOutput)
+		case "$meld_has_output_option" in
+		true | false)
+			: use configured value
+			;;
+		*)
+			: empty or invalid configured value, detecting "--output" automatically
+			init_meld_help_msg
+
+			case "$meld_help_msg" in
+			*"--output="* | *'[OPTION...]'*)
+				# All version that has [OPTION...] supports --output
+				meld_has_output_option=true
+				;;
+			*)
+				meld_has_output_option=false
+				;;
+			esac
+			;;
+		esac
+	fi
+	# Check whether we should use 'meld --auto-merge ...'
+	if test -z "$meld_use_auto_merge_option"
 	then
-		: old ones mention --output and new ones just say OPTION...
-		meld_has_output_option=true
-	else
-		meld_has_output_option=false
+		meld_use_auto_merge_option=$(
+			git config --bool-or-str mergetool.meld.useAutoMerge
+		)
+		case "$meld_use_auto_merge_option" in
+		true | false)
+			: use well formatted boolean value
+			;;
+		auto)
+			# testing the "--auto-merge" option only if config is "auto"
+			init_meld_help_msg
+
+			case "$meld_help_msg" in
+			*"--auto-merge"* | *'[OPTION...]'*)
+				meld_use_auto_merge_option=true
+				;;
+			*)
+				meld_use_auto_merge_option=false
+				;;
+			esac
+			;;
+		"")
+			meld_use_auto_merge_option=false
+			;;
+		*)
+			die "unknown mergetool.meld.useAutoMerge: $meld_use_auto_merge_option"
+			;;
+		esac
 	fi
 }
diff --git a/object.h b/object.h
index 96a2105..20b1880 100644
--- a/object.h
+++ b/object.h
@@ -73,6 +73,7 @@
  * sha1-name.c:                                              20
  * list-objects-filter.c:                                      21
  * builtin/fsck.c:           0--3
+ * builtin/gc.c:             0
  * builtin/index-pack.c:                                     2021
  * builtin/pack-objects.c:                                   20
  * builtin/reflog.c:                   10--12
diff --git a/oidset.c b/oidset.c
index 15d4e18..2d0ab76 100644
--- a/oidset.c
+++ b/oidset.c
@@ -43,6 +43,12 @@
 
 void oidset_parse_file(struct oidset *set, const char *path)
 {
+	oidset_parse_file_carefully(set, path, NULL, NULL);
+}
+
+void oidset_parse_file_carefully(struct oidset *set, const char *path,
+				 oidset_parse_tweak_fn fn, void *cbdata)
+{
 	FILE *fp;
 	struct strbuf sb = STRBUF_INIT;
 	struct object_id oid;
@@ -66,7 +72,8 @@
 		if (!sb.len)
 			continue;
 
-		if (parse_oid_hex(sb.buf, &oid, &p) || *p != '\0')
+		if (parse_oid_hex(sb.buf, &oid, &p) || *p != '\0' ||
+		    (fn && fn(&oid, cbdata)))
 			die("invalid object name: %s", sb.buf);
 		oidset_insert(set, &oid);
 	}
diff --git a/oidset.h b/oidset.h
index 209ae7a..01f6560 100644
--- a/oidset.h
+++ b/oidset.h
@@ -73,6 +73,15 @@
  */
 void oidset_parse_file(struct oidset *set, const char *path);
 
+/*
+ * Similar to the above, but with a callback which can (1) return non-zero to
+ * signal displeasure with the object and (2) replace object ID with something
+ * else (meant to be used to "peel").
+ */
+typedef int (*oidset_parse_tweak_fn)(struct object_id *, void *);
+void oidset_parse_file_carefully(struct oidset *set, const char *path,
+				 oidset_parse_tweak_fn fn, void *cbdata);
+
 struct oidset_iter {
 	kh_oid_set_t *set;
 	khiter_t iter;
diff --git a/pack-write.c b/pack-write.c
index 685d327..a6cdb3c 100644
--- a/pack-write.c
+++ b/pack-write.c
@@ -117,10 +117,8 @@
 	list = sorted_by_sha;
 	for (i = 0; i < nr_objects; i++) {
 		struct pack_idx_entry *obj = *list++;
-		if (index_version < 2) {
-			uint32_t offset = htonl(obj->offset);
-			hashwrite(f, &offset, 4);
-		}
+		if (index_version < 2)
+			hashwrite_be32(f, obj->offset);
 		hashwrite(f, obj->oid.hash, the_hash_algo->rawsz);
 		if ((opts->flags & WRITE_IDX_STRICT) &&
 		    (i && oideq(&list[-2]->oid, &obj->oid)))
@@ -135,8 +133,7 @@
 		list = sorted_by_sha;
 		for (i = 0; i < nr_objects; i++) {
 			struct pack_idx_entry *obj = *list++;
-			uint32_t crc32_val = htonl(obj->crc32);
-			hashwrite(f, &crc32_val, 4);
+			hashwrite_be32(f, obj->crc32);
 		}
 
 		/* write the 32-bit offset table */
@@ -148,8 +145,7 @@
 			offset = (need_large_offset(obj->offset, opts)
 				  ? (0x80000000 | nr_large_offset++)
 				  : obj->offset);
-			offset = htonl(offset);
-			hashwrite(f, &offset, 4);
+			hashwrite_be32(f, offset);
 		}
 
 		/* write the large offset table */
diff --git a/packfile.c b/packfile.c
index 9ef2750..0929ebe 100644
--- a/packfile.c
+++ b/packfile.c
@@ -923,6 +923,7 @@
 			count += p->num_objects;
 		}
 		r->objects->approximate_object_count = count;
+		r->objects->approximate_object_count_valid = 1;
 	}
 	return r->objects->approximate_object_count;
 }
@@ -1474,7 +1475,7 @@
 static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
 	void *base, unsigned long base_size, enum object_type type)
 {
-	struct delta_base_cache_entry *ent = xmalloc(sizeof(*ent));
+	struct delta_base_cache_entry *ent;
 	struct list_head *lru, *tmp;
 
 	/*
@@ -1482,8 +1483,10 @@
 	 * is unpacking the same object, in unpack_entry() (since its phases I
 	 * and III might run concurrently across multiple threads).
 	 */
-	if (in_delta_base_cache(p, base_offset))
+	if (in_delta_base_cache(p, base_offset)) {
+		free(base);
 		return;
+	}
 
 	delta_base_cached += base_size;
 
@@ -1495,6 +1498,7 @@
 		release_delta_base_cache(f);
 	}
 
+	ent = xmalloc(sizeof(*ent));
 	ent->key.p = p;
 	ent->key.base_offset = base_offset;
 	ent->type = type;
@@ -1775,12 +1779,10 @@
 		void *external_base = NULL;
 		unsigned long delta_size, base_size = size;
 		int i;
+		off_t base_obj_offset = obj_offset;
 
 		data = NULL;
 
-		if (base)
-			add_delta_base_cache(p, obj_offset, base, base_size, type);
-
 		if (!base) {
 			/*
 			 * We're probably in deep shit, but let's try to fetch
@@ -1818,24 +1820,33 @@
 			      "at offset %"PRIuMAX" from %s",
 			      (uintmax_t)curpos, p->pack_name);
 			data = NULL;
-			free(external_base);
-			continue;
+		} else {
+			data = patch_delta(base, base_size, delta_data,
+					   delta_size, &size);
+
+			/*
+			 * We could not apply the delta; warn the user, but
+			 * keep going. Our failure will be noticed either in
+			 * the next iteration of the loop, or if this is the
+			 * final delta, in the caller when we return NULL.
+			 * Those code paths will take care of making a more
+			 * explicit warning and retrying with another copy of
+			 * the object.
+			 */
+			if (!data)
+				error("failed to apply delta");
 		}
 
-		data = patch_delta(base, base_size,
-				   delta_data, delta_size,
-				   &size);
-
 		/*
-		 * We could not apply the delta; warn the user, but keep going.
-		 * Our failure will be noticed either in the next iteration of
-		 * the loop, or if this is the final delta, in the caller when
-		 * we return NULL. Those code paths will take care of making
-		 * a more explicit warning and retrying with another copy of
-		 * the object.
+		 * We delay adding `base` to the cache until the end of the loop
+		 * because unpack_compressed_entry() momentarily releases the
+		 * obj_read_mutex, giving another thread the chance to access
+		 * the cache. Therefore, if `base` was already there, this other
+		 * thread could free() it (e.g. to make space for another entry)
+		 * before we are done using it.
 		 */
-		if (!data)
-			error("failed to apply delta");
+		if (!external_base)
+			add_delta_base_cache(p, base_obj_offset, base, base_size, type);
 
 		free(delta_data);
 		free(external_base);
diff --git a/protocol.c b/protocol.c
index 8d964fc..052d7ed 100644
--- a/protocol.c
+++ b/protocol.c
@@ -17,7 +17,6 @@
 enum protocol_version get_protocol_version_config(void)
 {
 	const char *value;
-	int val;
 	const char *git_test_k = "GIT_TEST_PROTOCOL_VERSION";
 	const char *git_test_v;
 
@@ -31,9 +30,6 @@
 		return version;
 	}
 
-	if (!git_config_get_bool("feature.experimental", &val) && val)
-		return protocol_v2;
-
 	git_test_v = getenv(git_test_k);
 	if (git_test_v && *git_test_v) {
 		enum protocol_version env = parse_protocol_version(git_test_v);
@@ -43,7 +39,7 @@
 		return env;
 	}
 
-	return protocol_v0;
+	return protocol_v2;
 }
 
 enum protocol_version determine_protocol_version_server(void)
diff --git a/ref-filter.c b/ref-filter.c
index 110bcd7..e0b8cd3 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -2167,9 +2167,9 @@
 	 * obtain the commit using the 'oid' available and discard all
 	 * non-commits early. The actual filtering is done later.
 	 */
-	if (filter->merge_commit || filter->with_commit || filter->no_commit || filter->verbose) {
-		commit = lookup_commit_reference_gently(the_repository, oid,
-							1);
+	if (filter->reachable_from || filter->unreachable_from ||
+	    filter->with_commit || filter->no_commit || filter->verbose) {
+		commit = lookup_commit_reference_gently(the_repository, oid, 1);
 		if (!commit)
 			return 0;
 		/* We perform the filtering for the '--contains' option... */
@@ -2231,13 +2231,21 @@
 	}
 }
 
-static void do_merge_filter(struct ref_filter_cbdata *ref_cbdata)
+#define EXCLUDE_REACHED 0
+#define INCLUDE_REACHED 1
+static void reach_filter(struct ref_array *array,
+			 struct commit_list *check_reachable,
+			 int include_reached)
 {
 	struct rev_info revs;
 	int i, old_nr;
-	struct ref_filter *filter = ref_cbdata->filter;
-	struct ref_array *array = ref_cbdata->array;
-	struct commit **to_clear = xcalloc(sizeof(struct commit *), array->nr);
+	struct commit **to_clear;
+	struct commit_list *cr;
+
+	if (!check_reachable)
+		return;
+
+	to_clear = xcalloc(sizeof(struct commit *), array->nr);
 
 	repo_init_revisions(the_repository, &revs, NULL);
 
@@ -2247,8 +2255,11 @@
 		to_clear[i] = item->commit;
 	}
 
-	filter->merge_commit->object.flags |= UNINTERESTING;
-	add_pending_object(&revs, &filter->merge_commit->object, "");
+	for (cr = check_reachable; cr; cr = cr->next) {
+		struct commit *merge_commit = cr->item;
+		merge_commit->object.flags |= UNINTERESTING;
+		add_pending_object(&revs, &merge_commit->object, "");
+	}
 
 	revs.limited = 1;
 	if (prepare_revision_walk(&revs))
@@ -2263,14 +2274,19 @@
 
 		int is_merged = !!(commit->object.flags & UNINTERESTING);
 
-		if (is_merged == (filter->merge == REF_FILTER_MERGED_INCLUDE))
+		if (is_merged == include_reached)
 			array->items[array->nr++] = array->items[i];
 		else
 			free_array_item(item);
 	}
 
 	clear_commit_marks_many(old_nr, to_clear, ALL_REV_FLAGS);
-	clear_commit_marks(filter->merge_commit, ALL_REV_FLAGS);
+
+	while (check_reachable) {
+		struct commit *merge_commit = pop_commit(&check_reachable);
+		clear_commit_marks(merge_commit, ALL_REV_FLAGS);
+	}
+
 	free(to_clear);
 }
 
@@ -2322,8 +2338,8 @@
 	clear_contains_cache(&ref_cbdata.no_contains_cache);
 
 	/*  Filters that need revision walking */
-	if (filter->merge_commit)
-		do_merge_filter(&ref_cbdata);
+	reach_filter(array, filter->reachable_from, INCLUDE_REACHED);
+	reach_filter(array, filter->unreachable_from, EXCLUDE_REACHED);
 
 	return ret;
 }
@@ -2541,31 +2557,22 @@
 {
 	struct ref_filter *rf = opt->value;
 	struct object_id oid;
-	int no_merged = starts_with(opt->long_name, "no");
+	struct commit *merge_commit;
 
 	BUG_ON_OPT_NEG(unset);
 
-	if (rf->merge) {
-		if (no_merged) {
-			return error(_("option `%s' is incompatible with --merged"),
-				     opt->long_name);
-		} else {
-			return error(_("option `%s' is incompatible with --no-merged"),
-				     opt->long_name);
-		}
-	}
-
-	rf->merge = no_merged
-		? REF_FILTER_MERGED_OMIT
-		: REF_FILTER_MERGED_INCLUDE;
-
 	if (get_oid(arg, &oid))
 		die(_("malformed object name %s"), arg);
 
-	rf->merge_commit = lookup_commit_reference_gently(the_repository,
-							  &oid, 0);
-	if (!rf->merge_commit)
+	merge_commit = lookup_commit_reference_gently(the_repository, &oid, 0);
+
+	if (!merge_commit)
 		return error(_("option `%s' must point to a commit"), opt->long_name);
 
+	if (starts_with(opt->long_name, "no"))
+		commit_list_insert(merge_commit, &rf->unreachable_from);
+	else
+		commit_list_insert(merge_commit, &rf->reachable_from);
+
 	return 0;
 }
diff --git a/ref-filter.h b/ref-filter.h
index 8ecc33c..feaef4a 100644
--- a/ref-filter.h
+++ b/ref-filter.h
@@ -54,13 +54,8 @@
 	struct oid_array points_at;
 	struct commit_list *with_commit;
 	struct commit_list *no_commit;
-
-	enum {
-		REF_FILTER_MERGED_NONE = 0,
-		REF_FILTER_MERGED_INCLUDE,
-		REF_FILTER_MERGED_OMIT
-	} merge;
-	struct commit *merge_commit;
+	struct commit_list *reachable_from;
+	struct commit_list *unreachable_from;
 
 	unsigned int with_commit_tag_algo : 1,
 		match_as_path : 1,
diff --git a/refs.c b/refs.c
index 8374dfe..fa01153 100644
--- a/refs.c
+++ b/refs.c
@@ -1774,6 +1774,7 @@
 		BUG("attempting to get main_ref_store outside of repository");
 
 	r->refs_private = ref_store_init(r->gitdir, REF_STORE_ALL_CAPS);
+	r->refs_private = maybe_debug_wrap_ref_store(r->gitdir, r->refs_private);
 	return r->refs_private;
 }
 
diff --git a/refs/debug.c b/refs/debug.c
new file mode 100644
index 0000000..922e64f
--- /dev/null
+++ b/refs/debug.c
@@ -0,0 +1,398 @@
+
+#include "refs-internal.h"
+#include "trace.h"
+
+static struct trace_key trace_refs = TRACE_KEY_INIT(REFS);
+
+struct debug_ref_store {
+	struct ref_store base;
+	struct ref_store *refs;
+};
+
+extern struct ref_storage_be refs_be_debug;
+
+struct ref_store *maybe_debug_wrap_ref_store(const char *gitdir, struct ref_store *store)
+{
+	struct debug_ref_store *res;
+	struct ref_storage_be *be_copy;
+
+	if (!trace_want(&trace_refs)) {
+		return store;
+	}
+	res = xmalloc(sizeof(struct debug_ref_store));
+	be_copy = xmalloc(sizeof(*be_copy));
+	*be_copy = refs_be_debug;
+	/* we never deallocate backends, so safe to copy the pointer. */
+	be_copy->name = store->be->name;
+	trace_printf_key(&trace_refs, "ref_store for %s\n", gitdir);
+	res->refs = store;
+	base_ref_store_init((struct ref_store *)res, be_copy);
+	return (struct ref_store *)res;
+}
+
+static int debug_init_db(struct ref_store *refs, struct strbuf *err)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)refs;
+	int res = drefs->refs->be->init_db(drefs->refs, err);
+	trace_printf_key(&trace_refs, "init_db: %d\n", res);
+	return res;
+}
+
+static int debug_transaction_prepare(struct ref_store *refs,
+				     struct ref_transaction *transaction,
+				     struct strbuf *err)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)refs;
+	int res;
+	transaction->ref_store = drefs->refs;
+	res = drefs->refs->be->transaction_prepare(drefs->refs, transaction,
+						   err);
+	trace_printf_key(&trace_refs, "transaction_prepare: %d\n", res);
+	return res;
+}
+
+static void print_update(int i, const char *refname,
+			 const struct object_id *old_oid,
+			 const struct object_id *new_oid, unsigned int flags,
+			 unsigned int type, const char *msg)
+{
+	char o[GIT_MAX_HEXSZ + 1] = "null";
+	char n[GIT_MAX_HEXSZ + 1] = "null";
+	if (old_oid)
+		oid_to_hex_r(o, old_oid);
+	if (new_oid)
+		oid_to_hex_r(n, new_oid);
+
+	type &= 0xf; /* see refs.h REF_* */
+	flags &= REF_HAVE_NEW | REF_HAVE_OLD | REF_NO_DEREF |
+		REF_FORCE_CREATE_REFLOG;
+	trace_printf_key(&trace_refs, "%d: %s %s -> %s (F=0x%x, T=0x%x) \"%s\"\n", i, refname,
+		o, n, flags, type, msg);
+}
+
+static void print_transaction(struct ref_transaction *transaction)
+{
+	int i;
+	trace_printf_key(&trace_refs, "transaction {\n");
+	for (i = 0; i < transaction->nr; i++) {
+		struct ref_update *u = transaction->updates[i];
+		print_update(i, u->refname, &u->old_oid, &u->new_oid, u->flags,
+			     u->type, u->msg);
+	}
+	trace_printf_key(&trace_refs, "}\n");
+}
+
+static int debug_transaction_finish(struct ref_store *refs,
+				    struct ref_transaction *transaction,
+				    struct strbuf *err)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)refs;
+	int res;
+	transaction->ref_store = drefs->refs;
+	res = drefs->refs->be->transaction_finish(drefs->refs, transaction,
+						  err);
+	print_transaction(transaction);
+	trace_printf_key(&trace_refs, "finish: %d\n", res);
+	return res;
+}
+
+static int debug_transaction_abort(struct ref_store *refs,
+				   struct ref_transaction *transaction,
+				   struct strbuf *err)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)refs;
+	int res;
+	transaction->ref_store = drefs->refs;
+	res = drefs->refs->be->transaction_abort(drefs->refs, transaction, err);
+	return res;
+}
+
+static int debug_initial_transaction_commit(struct ref_store *refs,
+					    struct ref_transaction *transaction,
+					    struct strbuf *err)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)refs;
+	int res;
+	transaction->ref_store = drefs->refs;
+	res = drefs->refs->be->initial_transaction_commit(drefs->refs,
+							  transaction, err);
+	return res;
+}
+
+static int debug_pack_refs(struct ref_store *ref_store, unsigned int flags)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	int res = drefs->refs->be->pack_refs(drefs->refs, flags);
+	trace_printf_key(&trace_refs, "pack_refs: %d\n", res);
+	return res;
+}
+
+static int debug_create_symref(struct ref_store *ref_store,
+			       const char *ref_name, const char *target,
+			       const char *logmsg)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	int res = drefs->refs->be->create_symref(drefs->refs, ref_name, target,
+						 logmsg);
+	trace_printf_key(&trace_refs, "create_symref: %s -> %s \"%s\": %d\n", ref_name,
+		target, logmsg, res);
+	return res;
+}
+
+static int debug_delete_refs(struct ref_store *ref_store, const char *msg,
+			     struct string_list *refnames, unsigned int flags)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	int res =
+		drefs->refs->be->delete_refs(drefs->refs, msg, refnames, flags);
+	int i;
+	trace_printf_key(&trace_refs, "delete_refs {\n");
+	for (i = 0; i < refnames->nr; i++)
+		trace_printf_key(&trace_refs, "%s\n", refnames->items[i].string);
+	trace_printf_key(&trace_refs, "}: %d\n", res);
+	return res;
+}
+
+static int debug_rename_ref(struct ref_store *ref_store, const char *oldref,
+			    const char *newref, const char *logmsg)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	int res = drefs->refs->be->rename_ref(drefs->refs, oldref, newref,
+					      logmsg);
+	trace_printf_key(&trace_refs, "rename_ref: %s -> %s \"%s\": %d\n", oldref, newref,
+		logmsg, res);
+	return res;
+}
+
+static int debug_copy_ref(struct ref_store *ref_store, const char *oldref,
+			  const char *newref, const char *logmsg)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	int res =
+		drefs->refs->be->copy_ref(drefs->refs, oldref, newref, logmsg);
+	trace_printf_key(&trace_refs, "copy_ref: %s -> %s \"%s\": %d\n", oldref, newref,
+		logmsg, res);
+	return res;
+}
+
+struct debug_ref_iterator {
+	struct ref_iterator base;
+	struct ref_iterator *iter;
+};
+
+static int debug_ref_iterator_advance(struct ref_iterator *ref_iterator)
+{
+	struct debug_ref_iterator *diter =
+		(struct debug_ref_iterator *)ref_iterator;
+	int res = diter->iter->vtable->advance(diter->iter);
+	if (res)
+		trace_printf_key(&trace_refs, "iterator_advance: (%d)\n", res);
+	else
+		trace_printf_key(&trace_refs, "iterator_advance: %s (0)\n",
+			diter->iter->refname);
+
+	diter->base.ordered = diter->iter->ordered;
+	diter->base.refname = diter->iter->refname;
+	diter->base.oid = diter->iter->oid;
+	diter->base.flags = diter->iter->flags;
+	return res;
+}
+
+static int debug_ref_iterator_peel(struct ref_iterator *ref_iterator,
+				   struct object_id *peeled)
+{
+	struct debug_ref_iterator *diter =
+		(struct debug_ref_iterator *)ref_iterator;
+	int res = diter->iter->vtable->peel(diter->iter, peeled);
+	trace_printf_key(&trace_refs, "iterator_peel: %s: %d\n", diter->iter->refname, res);
+	return res;
+}
+
+static int debug_ref_iterator_abort(struct ref_iterator *ref_iterator)
+{
+	struct debug_ref_iterator *diter =
+		(struct debug_ref_iterator *)ref_iterator;
+	int res = diter->iter->vtable->abort(diter->iter);
+	trace_printf_key(&trace_refs, "iterator_abort: %d\n", res);
+	return res;
+}
+
+static struct ref_iterator_vtable debug_ref_iterator_vtable = {
+	debug_ref_iterator_advance, debug_ref_iterator_peel,
+	debug_ref_iterator_abort
+};
+
+static struct ref_iterator *
+debug_ref_iterator_begin(struct ref_store *ref_store, const char *prefix,
+			 unsigned int flags)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	struct ref_iterator *res =
+		drefs->refs->be->iterator_begin(drefs->refs, prefix, flags);
+	struct debug_ref_iterator *diter = xcalloc(1, sizeof(*diter));
+	base_ref_iterator_init(&diter->base, &debug_ref_iterator_vtable, 1);
+	diter->iter = res;
+	trace_printf_key(&trace_refs, "ref_iterator_begin: %s (0x%x)\n", prefix, flags);
+	return &diter->base;
+}
+
+static int debug_read_raw_ref(struct ref_store *ref_store, const char *refname,
+			      struct object_id *oid, struct strbuf *referent,
+			      unsigned int *type)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	int res = 0;
+
+	oidcpy(oid, &null_oid);
+	res = drefs->refs->be->read_raw_ref(drefs->refs, refname, oid, referent,
+					    type);
+
+	if (res == 0) {
+		trace_printf_key(&trace_refs, "read_raw_ref: %s: %s (=> %s) type %x: %d\n",
+			refname, oid_to_hex(oid), referent->buf, *type, res);
+	} else {
+		trace_printf_key(&trace_refs, "read_raw_ref: %s: %d\n", refname, res);
+	}
+	return res;
+}
+
+static struct ref_iterator *
+debug_reflog_iterator_begin(struct ref_store *ref_store)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	struct ref_iterator *res =
+		drefs->refs->be->reflog_iterator_begin(drefs->refs);
+	trace_printf_key(&trace_refs, "for_each_reflog_iterator_begin\n");
+	return res;
+}
+
+struct debug_reflog {
+	const char *refname;
+	each_reflog_ent_fn *fn;
+	void *cb_data;
+};
+
+static int debug_print_reflog_ent(struct object_id *old_oid,
+				  struct object_id *new_oid,
+				  const char *committer, timestamp_t timestamp,
+				  int tz, const char *msg, void *cb_data)
+{
+	struct debug_reflog *dbg = (struct debug_reflog *)cb_data;
+	int ret;
+	char o[GIT_MAX_HEXSZ + 1] = "null";
+	char n[GIT_MAX_HEXSZ + 1] = "null";
+	if (old_oid)
+		oid_to_hex_r(o, old_oid);
+	if (new_oid)
+		oid_to_hex_r(n, new_oid);
+
+	ret = dbg->fn(old_oid, new_oid, committer, timestamp, tz, msg,
+		      dbg->cb_data);
+	trace_printf_key(&trace_refs, "reflog_ent %s (ret %d): %s -> %s, %s %ld \"%s\"\n",
+		dbg->refname, ret, o, n, committer, (long int)timestamp, msg);
+	return ret;
+}
+
+static int debug_for_each_reflog_ent(struct ref_store *ref_store,
+				     const char *refname, each_reflog_ent_fn fn,
+				     void *cb_data)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	struct debug_reflog dbg = {
+		.refname = refname,
+		.fn = fn,
+		.cb_data = cb_data,
+	};
+
+	int res = drefs->refs->be->for_each_reflog_ent(
+		drefs->refs, refname, &debug_print_reflog_ent, &dbg);
+	trace_printf_key(&trace_refs, "for_each_reflog: %s: %d\n", refname, res);
+	return res;
+}
+
+static int debug_for_each_reflog_ent_reverse(struct ref_store *ref_store,
+					     const char *refname,
+					     each_reflog_ent_fn fn,
+					     void *cb_data)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	struct debug_reflog dbg = {
+		.refname = refname,
+		.fn = fn,
+		.cb_data = cb_data,
+	};
+	int res = drefs->refs->be->for_each_reflog_ent_reverse(
+		drefs->refs, refname, &debug_print_reflog_ent, &dbg);
+	trace_printf_key(&trace_refs, "for_each_reflog_reverse: %s: %d\n", refname, res);
+	return res;
+}
+
+static int debug_reflog_exists(struct ref_store *ref_store, const char *refname)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	int res = drefs->refs->be->reflog_exists(drefs->refs, refname);
+	trace_printf_key(&trace_refs, "reflog_exists: %s: %d\n", refname, res);
+	return res;
+}
+
+static int debug_create_reflog(struct ref_store *ref_store, const char *refname,
+			       int force_create, struct strbuf *err)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	int res = drefs->refs->be->create_reflog(drefs->refs, refname,
+						 force_create, err);
+	trace_printf_key(&trace_refs, "create_reflog: %s: %d\n", refname, res);
+	return res;
+}
+
+static int debug_delete_reflog(struct ref_store *ref_store, const char *refname)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	int res = drefs->refs->be->delete_reflog(drefs->refs, refname);
+	trace_printf_key(&trace_refs, "delete_reflog: %s: %d\n", refname, res);
+	return res;
+}
+
+static int debug_reflog_expire(struct ref_store *ref_store, const char *refname,
+			       const struct object_id *oid, unsigned int flags,
+			       reflog_expiry_prepare_fn prepare_fn,
+			       reflog_expiry_should_prune_fn should_prune_fn,
+			       reflog_expiry_cleanup_fn cleanup_fn,
+			       void *policy_cb_data)
+{
+	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
+	int res = drefs->refs->be->reflog_expire(drefs->refs, refname, oid,
+						 flags, prepare_fn,
+						 should_prune_fn, cleanup_fn,
+						 policy_cb_data);
+	trace_printf_key(&trace_refs, "reflog_expire: %s: %d\n", refname, res);
+	return res;
+}
+
+struct ref_storage_be refs_be_debug = {
+	NULL,
+	"debug",
+	NULL,
+	debug_init_db,
+	debug_transaction_prepare,
+	debug_transaction_finish,
+	debug_transaction_abort,
+	debug_initial_transaction_commit,
+
+	debug_pack_refs,
+	debug_create_symref,
+	debug_delete_refs,
+	debug_rename_ref,
+	debug_copy_ref,
+
+	debug_ref_iterator_begin,
+	debug_read_raw_ref,
+
+	debug_reflog_iterator_begin,
+	debug_for_each_reflog_ent,
+	debug_for_each_reflog_ent_reverse,
+	debug_reflog_exists,
+	debug_create_reflog,
+	debug_delete_reflog,
+	debug_reflog_expire,
+};
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 87a1201..467f4b3 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -697,4 +697,9 @@
 void base_ref_store_init(struct ref_store *refs,
 			 const struct ref_storage_be *be);
 
+/*
+ * Support GIT_TRACE_REFS by optionally wrapping the given ref_store instance.
+ */
+struct ref_store *maybe_debug_wrap_ref_store(const char *gitdir, struct ref_store *store);
+
 #endif /* REFS_REFS_INTERNAL_H */
diff --git a/remote.h b/remote.h
index 5e3ea5a..eb62a47 100644
--- a/remote.h
+++ b/remote.h
@@ -93,6 +93,14 @@
 
 int remote_has_url(struct remote *remote, const char *url);
 
+struct ref_push_report {
+	const char *ref_name;
+	struct object_id *old_oid;
+	struct object_id *new_oid;
+	unsigned int forced_update:1;
+	struct ref_push_report *next;
+};
+
 struct ref {
 	struct ref *next;
 	struct object_id old_oid;
@@ -140,6 +148,7 @@
 		REF_STATUS_ATOMIC_PUSH_FAILED
 	} status;
 	char *remote_status;
+	struct ref_push_report *report;
 	struct ref *peer_ref; /* when renaming */
 	char name[FLEX_ARRAY]; /* more */
 };
diff --git a/repo-settings.c b/repo-settings.c
index aa61a35..88ccce2 100644
--- a/repo-settings.c
+++ b/repo-settings.c
@@ -17,9 +17,12 @@
 
 	if (!repo_config_get_bool(r, "core.commitgraph", &value))
 		r->settings.core_commit_graph = value;
+	if (!repo_config_get_bool(r, "commitgraph.readchangedpaths", &value))
+		r->settings.commit_graph_read_changed_paths = value;
 	if (!repo_config_get_bool(r, "gc.writecommitgraph", &value))
 		r->settings.gc_write_commit_graph = value;
 	UPDATE_DEFAULT_BOOL(r->settings.core_commit_graph, 1);
+	UPDATE_DEFAULT_BOOL(r->settings.commit_graph_read_changed_paths, 1);
 	UPDATE_DEFAULT_BOOL(r->settings.gc_write_commit_graph, 1);
 
 	if (!repo_config_get_int(r, "index.version", &value))
diff --git a/repository.h b/repository.h
index 628c834..bacf843 100644
--- a/repository.h
+++ b/repository.h
@@ -30,6 +30,7 @@
 	int initialized;
 
 	int core_commit_graph;
+	int commit_graph_read_changed_paths;
 	int gc_write_commit_graph;
 	int fetch_write_commit_graph;
 
diff --git a/revision.c b/revision.c
index 067030e..d9dc578 100644
--- a/revision.c
+++ b/revision.c
@@ -681,10 +681,7 @@
 
 	repo_parse_commit(revs->repo, revs->commits->item);
 
-	if (!revs->repo->objects->commit_graph)
-		return;
-
-	revs->bloom_filter_settings = revs->repo->objects->commit_graph->bloom_filter_settings;
+	revs->bloom_filter_settings = get_bloom_filter_settings(revs->repo);
 	if (!revs->bloom_filter_settings)
 		return;
 
@@ -755,7 +752,7 @@
 	if (commit_graph_generation(commit) == GENERATION_NUMBER_INFINITY)
 		return -1;
 
-	filter = get_bloom_filter(revs->repo, commit, 0);
+	filter = get_bloom_filter(revs->repo, commit);
 
 	if (!filter) {
 		count_bloom_filter_not_present++;
diff --git a/run-command.c b/run-command.c
index cc9c329..2ee59ac 100644
--- a/run-command.c
+++ b/run-command.c
@@ -1866,15 +1866,13 @@
 	return result;
 }
 
-int run_auto_gc(int quiet)
+int run_auto_maintenance(int quiet)
 {
-	struct strvec argv_gc_auto = STRVEC_INIT;
-	int status;
+	struct child_process maint = CHILD_PROCESS_INIT;
 
-	strvec_pushl(&argv_gc_auto, "gc", "--auto", NULL);
-	if (quiet)
-		strvec_push(&argv_gc_auto, "--quiet");
-	status = run_command_v_opt(argv_gc_auto.v, RUN_GIT_CMD);
-	strvec_clear(&argv_gc_auto);
-	return status;
+	maint.git_cmd = 1;
+	strvec_pushl(&maint.args, "maintenance", "run", "--auto", NULL);
+	strvec_push(&maint.args, quiet ? "--quiet" : "--no-quiet");
+
+	return run_command(&maint);
 }
diff --git a/run-command.h b/run-command.h
index 8b9bfae..6472b38 100644
--- a/run-command.h
+++ b/run-command.h
@@ -221,7 +221,7 @@
 /*
  * Trigger an auto-gc
  */
-int run_auto_gc(int quiet);
+int run_auto_maintenance(int quiet);
 
 #define RUN_COMMAND_NO_STDIN 1
 #define RUN_GIT_CMD	     2	/*If this is to be git sub-command */
diff --git a/send-pack.c b/send-pack.c
index 632f158..c969807 100644
--- a/send-pack.c
+++ b/send-pack.c
@@ -154,25 +154,79 @@
 {
 	struct ref *hint;
 	int ret;
+	struct ref_push_report *report = NULL;
+	int new_report = 0;
+	int once = 0;
 
 	hint = NULL;
 	ret = receive_unpack_status(reader);
 	while (1) {
+		struct object_id old_oid, new_oid;
+		const char *head;
 		const char *refname;
-		char *msg;
+		char *p;
 		if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 			break;
-		if (!starts_with(reader->line, "ok ") && !starts_with(reader->line, "ng ")) {
-			error("invalid ref status from remote: %s", reader->line);
+		head = reader->line;
+		p = strchr(head, ' ');
+		if (!p) {
+			error("invalid status line from remote: %s", reader->line);
 			ret = -1;
 			break;
 		}
+		*p++ = '\0';
 
-		refname = reader->line + 3;
-		msg = strchr(refname, ' ');
-		if (msg)
-			*msg++ = '\0';
+		if (!strcmp(head, "option")) {
+			const char *key, *val;
 
+			if (!hint || !(report || new_report)) {
+				if (!once++)
+					error("'option' without a matching 'ok/ng' directive");
+				ret = -1;
+				continue;
+			}
+			if (new_report) {
+				if (!hint->report) {
+					hint->report = xcalloc(1, sizeof(struct ref_push_report));
+					report = hint->report;
+				} else {
+					report = hint->report;
+					while (report->next)
+						report = report->next;
+					report->next = xcalloc(1, sizeof(struct ref_push_report));
+					report = report->next;
+				}
+				new_report = 0;
+			}
+			key = p;
+			p = strchr(key, ' ');
+			if (p)
+				*p++ = '\0';
+			val = p;
+			if (!strcmp(key, "refname"))
+				report->ref_name = xstrdup_or_null(val);
+			else if (!strcmp(key, "old-oid") && val &&
+				 !parse_oid_hex(val, &old_oid, &val))
+				report->old_oid = oiddup(&old_oid);
+			else if (!strcmp(key, "new-oid") && val &&
+				 !parse_oid_hex(val, &new_oid, &val))
+				report->new_oid = oiddup(&new_oid);
+			else if (!strcmp(key, "forced-update"))
+				report->forced_update = 1;
+			continue;
+		}
+
+		report = NULL;
+		new_report = 0;
+		if (strcmp(head, "ok") && strcmp(head, "ng")) {
+			error("invalid ref status from remote: %s", head);
+			ret = -1;
+			break;
+		}
+		refname = p;
+		p = strchr(refname, ' ');
+		if (p)
+			*p++ = '\0';
 		/* first try searching at our hint, falling back to all refs */
 		if (hint)
 			hint = find_ref_by_name(hint, refname);
@@ -180,22 +234,27 @@
 			hint = find_ref_by_name(refs, refname);
 		if (!hint) {
 			warning("remote reported status on unknown ref: %s",
-					refname);
+				refname);
 			continue;
 		}
-		if (hint->status != REF_STATUS_EXPECTING_REPORT) {
+		if (hint->status != REF_STATUS_EXPECTING_REPORT &&
+		    hint->status != REF_STATUS_OK &&
+		    hint->status != REF_STATUS_REMOTE_REJECT) {
 			warning("remote reported status on unexpected ref: %s",
-					refname);
+				refname);
 			continue;
 		}
-
-		if (reader->line[0] == 'o' && reader->line[1] == 'k')
-			hint->status = REF_STATUS_OK;
-		else
+		if (!strcmp(head, "ng")) {
 			hint->status = REF_STATUS_REMOTE_REJECT;
-		hint->remote_status = xstrdup_or_null(msg);
-		/* start our next search from the next ref */
-		hint = hint->next;
+			if (p)
+				hint->remote_status = xstrdup(p);
+			else
+				hint->remote_status = "failed";
+		} else {
+			hint->status = REF_STATUS_OK;
+			hint->remote_status = xstrdup_or_null(p);
+			new_report = 1;
+		}
 	}
 	return ret;
 }
@@ -244,7 +303,12 @@
 		return CHECK_REF_STATUS_REJECTED;
 	case REF_STATUS_UPTODATE:
 		return CHECK_REF_UPTODATE;
+
 	default:
+	case REF_STATUS_EXPECTING_REPORT:
+		/* already passed checks on the local side */
+	case REF_STATUS_OK:
+		/* of course this is OK */
 		return 0;
 	}
 }
@@ -371,7 +435,9 @@
 	struct packet_reader reader;
 
 	/* Does the other end support the reporting? */
-	if (server_supports("report-status"))
+	if (server_supports("report-status-v2"))
+		status_report = 2;
+	else if (server_supports("report-status"))
 		status_report = 1;
 	if (server_supports("delete-refs"))
 		allow_deleting_refs = 1;
@@ -423,8 +489,10 @@
 
 	use_push_options = push_options_supported && args->push_options;
 
-	if (status_report)
+	if (status_report == 1)
 		strbuf_addstr(&cap_buf, " report-status");
+	else if (status_report == 2)
+		strbuf_addstr(&cap_buf, " report-status-v2");
 	if (use_sideband)
 		strbuf_addstr(&cap_buf, " side-band-64k");
 	if (quiet_supported && (args->quiet || !args->progress))
@@ -447,13 +515,6 @@
 		if (ref->deletion && !allow_deleting_refs)
 			ref->status = REF_STATUS_REJECT_NODELETE;
 
-	if (!args->dry_run)
-		advertise_shallow_grafts_buf(&req_buf);
-
-	if (!args->dry_run && push_cert_nonce)
-		cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
-					       cap_buf.buf, push_cert_nonce);
-
 	/*
 	 * Clear the status for each ref and see if we need to send
 	 * the pack data.
@@ -489,31 +550,35 @@
 			ref->status = REF_STATUS_EXPECTING_REPORT;
 	}
 
+	if (!args->dry_run)
+		advertise_shallow_grafts_buf(&req_buf);
+
 	/*
 	 * Finally, tell the other end!
 	 */
-	for (ref = remote_refs; ref; ref = ref->next) {
-		char *old_hex, *new_hex;
+	if (!args->dry_run && push_cert_nonce)
+		cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
+					       cap_buf.buf, push_cert_nonce);
+	else if (!args->dry_run)
+		for (ref = remote_refs; ref; ref = ref->next) {
+			char *old_hex, *new_hex;
 
-		if (args->dry_run || push_cert_nonce)
-			continue;
+			if (check_to_send_update(ref, args) < 0)
+				continue;
 
-		if (check_to_send_update(ref, args) < 0)
-			continue;
-
-		old_hex = oid_to_hex(&ref->old_oid);
-		new_hex = oid_to_hex(&ref->new_oid);
-		if (!cmds_sent) {
-			packet_buf_write(&req_buf,
-					 "%s %s %s%c%s",
-					 old_hex, new_hex, ref->name, 0,
-					 cap_buf.buf);
-			cmds_sent = 1;
-		} else {
-			packet_buf_write(&req_buf, "%s %s %s",
-					 old_hex, new_hex, ref->name);
+			old_hex = oid_to_hex(&ref->old_oid);
+			new_hex = oid_to_hex(&ref->new_oid);
+			if (!cmds_sent) {
+				packet_buf_write(&req_buf,
+						 "%s %s %s%c%s",
+						 old_hex, new_hex, ref->name, 0,
+						 cap_buf.buf);
+				cmds_sent = 1;
+			} else {
+				packet_buf_write(&req_buf, "%s %s %s",
+						 old_hex, new_hex, ref->name);
+			}
 		}
-	}
 
 	if (use_push_options) {
 		struct string_list_item *item;
diff --git a/sequencer.c b/sequencer.c
index e8676e9..3367eb5 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -120,7 +120,7 @@
 static GIT_PATH_FUNC(rebase_path_amend, "rebase-merge/amend")
 /*
  * When we stop at a given patch via the "edit" command, this file contains
- * the abbreviated commit name of the corresponding patch.
+ * the commit object name of the corresponding patch.
  */
 static GIT_PATH_FUNC(rebase_path_stopped_sha, "rebase-merge/stopped-sha")
 /*
@@ -3111,11 +3111,12 @@
 {
 	struct strbuf buf = STRBUF_INIT;
 	struct rev_info log_tree_opt;
-	const char *subject, *p;
+	const char *subject;
+	char hex[GIT_MAX_HEXSZ + 1];
 	int res = 0;
 
-	p = short_commit_name(commit);
-	if (write_message(p, strlen(p), rebase_path_stopped_sha(), 1) < 0)
+	oid_to_hex_r(hex, &commit->object.oid);
+	if (write_message(hex, strlen(hex), rebase_path_stopped_sha(), 1) < 0)
 		return -1;
 	res |= write_rebase_head(&commit->object.oid);
 
@@ -4527,7 +4528,7 @@
 
 		if (read_oneliner(&buf, rebase_path_stopped_sha(),
 				  READ_ONELINER_SKIP_IF_EMPTY) &&
-		    !get_oid_committish(buf.buf, &oid))
+		    !get_oid_hex(buf.buf, &oid))
 			record_in_rewritten(&oid, peek_command(&todo_list, 0));
 		strbuf_release(&buf);
 	}
diff --git a/shortlog.h b/shortlog.h
index 2fa61c4..64be879 100644
--- a/shortlog.h
+++ b/shortlog.h
@@ -15,7 +15,13 @@
 	int in2;
 	int user_format;
 	int abbrev;
-	int committer;
+
+	enum {
+		SHORTLOG_GROUP_AUTHOR = (1 << 0),
+		SHORTLOG_GROUP_COMMITTER = (1 << 1),
+		SHORTLOG_GROUP_TRAILER = (1 << 2),
+	} groups;
+	struct string_list trailers;
 
 	char *common_repo_prefix;
 	int email;
diff --git a/t/chainlint.sed b/t/chainlint.sed
index 70df40e..8a25c5b 100644
--- a/t/chainlint.sed
+++ b/t/chainlint.sed
@@ -117,7 +117,7 @@
 /^[ 	]*!*[ 	]*(..*)[ 	]*[0-9]*[<>|&]/boneline
 
 # multi-line "(...\n...)"
-/^[ 	]*(/bsubshell
+/^[ 	]*(/bsubsh
 
 # innocuous line -- print it and advance to next line
 b
@@ -130,11 +130,11 @@
 }
 b
 
-:subshell
+:subsh
 # bare "(" line? -- stash for later printing
 /^[ 	]*([	]*$/ {
 	h
-	bnextline
+	bnextln
 }
 # "(..." line -- split off and stash "(", then process "..." as its own line
 x
@@ -143,7 +143,7 @@
 s/(//
 bslurp
 
-:nextline
+:nextln
 N
 s/.*\n//
 
@@ -151,10 +151,10 @@
 # incomplete line "...\"
 /\\$/bicmplte
 # multi-line quoted string "...\n..."?
-/"/bdqstring
+/"/bdqstr
 # multi-line quoted string '...\n...'? (but not contraction in string "it's")
 /'/{
-	/"[^'"]*'[^'"]*"/!bsqstring
+	/"[^'"]*'[^'"]*"/!bsqstr
 }
 :folded
 # here-doc -- swallow it
@@ -163,8 +163,8 @@
 # before closing ")", "done", "elsif", "else", or "fi" will need to be
 # re-visited to drop "suspect" marking since final line of those constructs
 # legitimately lacks "&&", so "suspect" mark must be removed
-/^[ 	]*#/bnextline
-/^[ 	]*$/bnextline
+/^[ 	]*#/bnextln
+/^[ 	]*$/bnextln
 # in-line comment -- strip it (but not "#" in a string, Bash ${#...} array
 # length, or Perforce "//depot/path#42" revision in filespec)
 /[ 	]#/{
@@ -175,22 +175,22 @@
 # multi-line "case ... esac"
 /^[ 	]*case[ 	]..*[ 	]in/bcase
 # multi-line "for ... done" or "while ... done"
-/^[ 	]*for[ 	]..*[ 	]in/bcontinue
-/^[ 	]*while[ 	]/bcontinue
-/^[ 	]*do[ 	]/bcontinue
-/^[ 	]*do[ 	]*$/bcontinue
-/;[ 	]*do/bcontinue
+/^[ 	]*for[ 	]..*[ 	]in/bcont
+/^[ 	]*while[ 	]/bcont
+/^[ 	]*do[ 	]/bcont
+/^[ 	]*do[ 	]*$/bcont
+/;[ 	]*do/bcont
 /^[ 	]*done[ 	]*&&[ 	]*$/bdone
 /^[ 	]*done[ 	]*$/bdone
 /^[ 	]*done[ 	]*[<>|]/bdone
 /^[ 	]*done[ 	]*)/bdone
-/||[ 	]*exit[ 	]/bcontinue
-/||[ 	]*exit[ 	]*$/bcontinue
+/||[ 	]*exit[ 	]/bcont
+/||[ 	]*exit[ 	]*$/bcont
 # multi-line "if...elsif...else...fi"
-/^[ 	]*if[ 	]/bcontinue
-/^[ 	]*then[ 	]/bcontinue
-/^[ 	]*then[ 	]*$/bcontinue
-/;[ 	]*then/bcontinue
+/^[ 	]*if[ 	]/bcont
+/^[ 	]*then[ 	]/bcont
+/^[ 	]*then[ 	]*$/bcont
+/;[ 	]*then/bcont
 /^[ 	]*elif[ 	]/belse
 /^[ 	]*elif[ 	]*$/belse
 /^[ 	]*else[ 	]/belse
@@ -234,10 +234,10 @@
 	}
 }
 # line ends with pipe "...|" -- valid; not missing "&&"
-/|[ 	]*$/bcontinue
+/|[ 	]*$/bcont
 # missing end-of-line "&&" -- mark suspect
 /&&[ 	]*$/!s/^/?!AMP?!/
-:continue
+:cont
 # retrieve and print previous line
 x
 n
@@ -250,7 +250,7 @@
 bslurp
 
 # check for multi-line double-quoted string "...\n..." -- fold to one line
-:dqstring
+:dqstr
 # remove all quote pairs
 s/"\([^"]*\)"/@!\1@!/g
 # done if no dangling quote
@@ -258,13 +258,13 @@
 # otherwise, slurp next line and try again
 N
 s/\n//
-bdqstring
+bdqstr
 :dqdone
 s/@!/"/g
 bfolded
 
 # check for multi-line single-quoted string '...\n...' -- fold to one line
-:sqstring
+:sqstr
 # remove all quote pairs
 s/'\([^']*\)'/@!\1@!/g
 # done if no dangling quote
@@ -272,7 +272,7 @@
 # otherwise, slurp next line and try again
 N
 s/\n//
-bsqstring
+bsqstr
 :sqdone
 s/@!/'/g
 bfolded
@@ -282,11 +282,11 @@
 :heredoc
 s/^\(.*\)<<[ 	]*[-\\'"]*\([A-Za-z0-9_][A-Za-z0-9_]*\)['"]*/<\2>\1<</
 s/[ 	]*<<//
-:heredsub
+:hdocsub
 N
 /^<\([^>]*\)>.*\n[ 	]*\1[ 	]*$/!{
 	s/\n.*$//
-	bheredsub
+	bhdocsub
 }
 s/^<[^>]*>//
 s/\n.*$//
@@ -305,7 +305,7 @@
 x
 s/?!AMP?!//
 x
-bcontinue
+bcont
 
 # found "done" closing for-loop or while-loop, or "fi" closing if-then -- drop
 # "suspect" from final contained line since that line legitimately lacks "&&"
@@ -321,10 +321,10 @@
 # found nested multi-line "(...\n...)" -- pass through untouched
 :nest
 x
-:nstslurp
+:nstslrp
 n
 # closing ")" on own line -- stop nested slurp
-/^[ 	]*)/bnstclose
+/^[ 	]*)/bnstcl
 # comment -- not closing ")" if in comment
 /^[ 	]*#/bnstcnt
 # "$((...))" -- arithmetic expansion; not closing ")"
@@ -332,11 +332,11 @@
 # "$(...)" -- command substitution; not closing ")"
 /\$([^)][^)]*)[^)]*$/bnstcnt
 # closing "...)" -- stop nested slurp
-/)/bnstclose
+/)/bnstcl
 :nstcnt
 x
-bnstslurp
-:nstclose
+bnstslrp
+:nstcl
 s/^/>>/
 # is it "))" which closes nested and parent subshells?
 /)[ 	]*)/bslurp
diff --git a/t/helper/test-bloom.c b/t/helper/test-bloom.c
index 5e77d56..46e97b0 100644
--- a/t/helper/test-bloom.c
+++ b/t/helper/test-bloom.c
@@ -39,7 +39,9 @@
 	struct bloom_filter *filter;
 	setup_git_directory();
 	c = lookup_commit(the_repository, commit_oid);
-	filter = get_bloom_filter(the_repository, c, 1);
+	filter = get_or_compute_bloom_filter(the_repository, c, 1,
+					     &settings,
+					     NULL);
 	print_bloom_filter(filter);
 }
 
diff --git a/t/helper/test-proc-receive.c b/t/helper/test-proc-receive.c
new file mode 100644
index 0000000..42164d9
--- /dev/null
+++ b/t/helper/test-proc-receive.c
@@ -0,0 +1,176 @@
+#include "cache.h"
+#include "connect.h"
+#include "parse-options.h"
+#include "pkt-line.h"
+#include "sigchain.h"
+#include "test-tool.h"
+
+static const char *proc_receive_usage[] = {
+	"test-tool proc-receive [<options>...]",
+	NULL
+};
+
+static int die_version;
+static int die_readline;
+static int no_push_options;
+static int use_atomic;
+static int use_push_options;
+static int verbose;
+static int version = 1;
+static struct string_list returns = STRING_LIST_INIT_NODUP;
+
+struct command {
+	struct command *next;
+	const char *error_string;
+	unsigned int skip_update:1,
+		     did_not_exist:1;
+	int index;
+	struct object_id old_oid;
+	struct object_id new_oid;
+	char ref_name[FLEX_ARRAY]; /* more */
+};
+
+static void proc_receive_verison(struct packet_reader *reader) {
+	int server_version = 0;
+
+	for (;;) {
+		int linelen;
+
+		if (packet_reader_read(reader) != PACKET_READ_NORMAL)
+			break;
+
+		if (reader->pktlen > 8 && starts_with(reader->line, "version=")) {
+			server_version = atoi(reader->line+8);
+			linelen = strlen(reader->line);
+			if (linelen < reader->pktlen) {
+				const char *feature_list = reader->line + linelen + 1;
+				if (parse_feature_request(feature_list, "atomic"))
+					use_atomic= 1;
+				if (parse_feature_request(feature_list, "push-options"))
+					use_push_options = 1;
+			}
+		}
+	}
+
+	if (server_version != 1 || die_version)
+		die("bad protocol version: %d", server_version);
+
+	packet_write_fmt(1, "version=%d%c%s\n",
+			 version, '\0',
+			 use_push_options && !no_push_options ? "push-options": "");
+	packet_flush(1);
+}
+
+static void proc_receive_read_commands(struct packet_reader *reader,
+				       struct command **commands)
+{
+	struct command **tail = commands;
+
+	for (;;) {
+		struct object_id old_oid, new_oid;
+		struct command *cmd;
+		const char *refname;
+		const char *p;
+
+		if (packet_reader_read(reader) != PACKET_READ_NORMAL)
+			break;
+
+		if (parse_oid_hex(reader->line, &old_oid, &p) ||
+		    *p++ != ' ' ||
+		    parse_oid_hex(p, &new_oid, &p) ||
+		    *p++ != ' ' ||
+		    die_readline)
+			die("protocol error: expected 'old new ref', got '%s'",
+			    reader->line);
+		refname = p;
+		FLEX_ALLOC_STR(cmd, ref_name, refname);
+		oidcpy(&cmd->old_oid, &old_oid);
+		oidcpy(&cmd->new_oid, &new_oid);
+
+		*tail = cmd;
+		tail = &cmd->next;
+	}
+}
+
+static void proc_receive_read_push_options(struct packet_reader *reader,
+					   struct string_list *options)
+{
+
+	if (no_push_options || !use_push_options)
+	       return;
+
+	while (1) {
+		if (packet_reader_read(reader) != PACKET_READ_NORMAL)
+			break;
+
+		string_list_append(options, reader->line);
+	}
+}
+
+int cmd__proc_receive(int argc, const char **argv)
+{
+	int nongit_ok = 0;
+	struct packet_reader reader;
+	struct command *commands = NULL;
+	struct string_list push_options = STRING_LIST_INIT_DUP;
+	struct string_list_item *item;
+	struct option options[] = {
+		OPT_BOOL(0, "no-push-options", &no_push_options,
+			 "disable push options"),
+		OPT_BOOL(0, "die-version", &die_version,
+			 "die during version negotiation"),
+		OPT_BOOL(0, "die-readline", &die_readline,
+			 "die when readline"),
+		OPT_STRING_LIST('r', "return", &returns, "old/new/ref/status/msg",
+				"return of results"),
+		OPT__VERBOSE(&verbose, "be verbose"),
+		OPT_INTEGER('V', "version", &version,
+			    "use this protocol version number"),
+		OPT_END()
+	};
+
+	setup_git_directory_gently(&nongit_ok);
+
+	argc = parse_options(argc, argv, "test-tools", options, proc_receive_usage, 0);
+	if (argc > 0)
+		usage_msg_opt("Too many arguments.", proc_receive_usage, options);
+	packet_reader_init(&reader, 0, NULL, 0,
+			   PACKET_READ_CHOMP_NEWLINE |
+			   PACKET_READ_DIE_ON_ERR_PACKET);
+
+	sigchain_push(SIGPIPE, SIG_IGN);
+	proc_receive_verison(&reader);
+	proc_receive_read_commands(&reader, &commands);
+	proc_receive_read_push_options(&reader, &push_options);
+
+	if (verbose) {
+		struct command *cmd;
+
+		if (use_push_options || use_atomic)
+			fprintf(stderr, "proc-receive:%s%s\n",
+				use_atomic? " atomic": "",
+				use_push_options ? " push_options": "");
+
+		for (cmd = commands; cmd; cmd = cmd->next)
+			fprintf(stderr, "proc-receive< %s %s %s\n",
+				oid_to_hex(&cmd->old_oid),
+				oid_to_hex(&cmd->new_oid),
+				cmd->ref_name);
+
+		if (push_options.nr > 0)
+			for_each_string_list_item(item, &push_options)
+				fprintf(stderr, "proc-receive< %s\n", item->string);
+
+		if (returns.nr)
+			for_each_string_list_item(item, &returns)
+				fprintf(stderr, "proc-receive> %s\n", item->string);
+	}
+
+	if (returns.nr)
+		for_each_string_list_item(item, &returns)
+			packet_write_fmt(1, "%s\n", item->string);
+	packet_flush(1);
+	sigchain_pop(SIGPIPE);
+
+	return 0;
+}
diff --git a/t/helper/test-reach.c b/t/helper/test-reach.c
index 14a3655..cda804e 100644
--- a/t/helper/test-reach.c
+++ b/t/helper/test-reach.c
@@ -107,6 +107,8 @@
 		printf("%s(A,B):%d\n", av[1], ref_newer(&oid_A, &oid_B));
 	else if (!strcmp(av[1], "in_merge_bases"))
 		printf("%s(A,B):%d\n", av[1], in_merge_bases(A, B));
+	else if (!strcmp(av[1], "in_merge_bases_many"))
+		printf("%s(A,X):%d\n", av[1], in_merge_bases_many(A, X_nr, X_array));
 	else if (!strcmp(av[1], "is_descendant_of"))
 		printf("%s(A,X):%d\n", av[1], repo_is_descendant_of(r, A, X));
 	else if (!strcmp(av[1], "get_merge_bases_many")) {
diff --git a/t/helper/test-read-graph.c b/t/helper/test-read-graph.c
index 6d0c962..5f585a1 100644
--- a/t/helper/test-read-graph.c
+++ b/t/helper/test-read-graph.c
@@ -12,11 +12,12 @@
 	setup_git_directory();
 	odb = the_repository->objects->odb;
 
+	prepare_repo_settings(the_repository);
+
 	graph = read_commit_graph_one(the_repository, odb);
 	if (!graph)
 		return 1;
 
-
 	printf("header: %08x %d %d %d %d\n",
 		ntohl(*(uint32_t*)graph->data),
 		*(unsigned char*)(graph->data + 4),
diff --git a/t/helper/test-tool.c b/t/helper/test-tool.c
index 590b2ef..a0d3966 100644
--- a/t/helper/test-tool.c
+++ b/t/helper/test-tool.c
@@ -46,6 +46,7 @@
 	{ "path-utils", cmd__path_utils },
 	{ "pkt-line", cmd__pkt_line },
 	{ "prio-queue", cmd__prio_queue },
+	{ "proc-receive", cmd__proc_receive},
 	{ "progress", cmd__progress },
 	{ "reach", cmd__reach },
 	{ "read-cache", cmd__read_cache },
diff --git a/t/helper/test-tool.h b/t/helper/test-tool.h
index ddc8e99..07034d3 100644
--- a/t/helper/test-tool.h
+++ b/t/helper/test-tool.h
@@ -35,6 +35,7 @@
 int cmd__path_utils(int argc, const char **argv);
 int cmd__pkt_line(int argc, const char **argv);
 int cmd__prio_queue(int argc, const char **argv);
+int cmd__proc_receive(int argc, const char **argv);
 int cmd__progress(int argc, const char **argv);
 int cmd__reach(int argc, const char **argv);
 int cmd__read_cache(int argc, const char **argv);
diff --git a/t/perf/p5303-many-packs.sh b/t/perf/p5303-many-packs.sh
index 7ee7916..f4c2ab0 100755
--- a/t/perf/p5303-many-packs.sh
+++ b/t/perf/p5303-many-packs.sh
@@ -73,6 +73,10 @@
 		git rev-list --objects --all >/dev/null
 	'
 
+	test_perf "abbrev-commit ($nr_packs)" '
+		git rev-list --abbrev-commit HEAD >/dev/null
+	'
+
 	# This simulates the interesting part of the repack, which is the
 	# actual pack generation, without smudging the on-disk setup
 	# between trials.
diff --git a/t/t0095-bloom.sh b/t/t0095-bloom.sh
index 232ba2c..7e4ab17 100755
--- a/t/t0095-bloom.sh
+++ b/t/t0095-bloom.sh
@@ -71,8 +71,8 @@
 	git init &&
 	git commit --allow-empty -m "c0" &&
 	cat >expect <<-\EOF &&
-	Filter_Length:0
-	Filter_Data:
+	Filter_Length:1
+	Filter_Data:00|
 	EOF
 	test-tool bloom get_filter_for_commit "$(git rev-parse HEAD)" >actual &&
 	test_cmp expect actual
@@ -107,8 +107,8 @@
 	git add bigDir &&
 	git commit -m "commit with 513 changes" &&
 	cat >expect <<-\EOF &&
-	Filter_Length:0
-	Filter_Data:
+	Filter_Length:1
+	Filter_Data:ff|
 	EOF
 	test-tool bloom get_filter_for_commit "$(git rev-parse HEAD)" >actual &&
 	test_cmp expect actual
diff --git a/t/t1506-rev-parse-diagnosis.sh b/t/t1506-rev-parse-diagnosis.sh
index dbf690b..3e657e6 100755
--- a/t/t1506-rev-parse-diagnosis.sh
+++ b/t/t1506-rev-parse-diagnosis.sh
@@ -190,6 +190,24 @@
 	test_cmp expect actual
 '
 
+test_expect_success 'dotdot does not peel endpoints' '
+	git tag -a -m "annote" annotated HEAD &&
+	A=$(git rev-parse annotated) &&
+	H=$(git rev-parse annotated^0) &&
+	{
+		echo $A && echo ^$A
+	} >expect-with-two-dots &&
+	{
+		echo $A && echo $A && echo ^$H
+	} >expect-with-merge-base &&
+
+	git rev-parse annotated..annotated >actual-with-two-dots &&
+	test_cmp expect-with-two-dots actual-with-two-dots &&
+
+	git rev-parse annotated...annotated >actual-with-merge-base &&
+	test_cmp expect-with-merge-base actual-with-merge-base
+'
+
 test_expect_success 'arg before dashdash must be a revision (missing)' '
 	test_must_fail git rev-parse foobar -- 2>stderr &&
 	test_i18ngrep "bad revision" stderr
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 79b6027..6efe7a4 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -1299,10 +1299,6 @@
 	test_must_fail git branch --merged 0000000000000000000000000000000000000000
 '
 
-test_expect_success '--merged is incompatible with --no-merged' '
-	test_must_fail git branch --merged HEAD --no-merged HEAD
-'
-
 test_expect_success '--list during rebase' '
 	test_when_finished "reset_rebase" &&
 	git checkout master &&
diff --git a/t/t3201-branch-contains.sh b/t/t3201-branch-contains.sh
index 40251c9..efea5c4 100755
--- a/t/t3201-branch-contains.sh
+++ b/t/t3201-branch-contains.sh
@@ -171,6 +171,69 @@
 	test_must_fail git branch --no-contains $blob
 '
 
+test_expect_success 'multiple branch --contains' '
+	git checkout -b side2 master &&
+	>feature &&
+	git add feature &&
+	git commit -m "add feature" &&
+	git checkout -b next master &&
+	git merge side &&
+	git branch --contains side --contains side2 >actual &&
+	cat >expect <<-\EOF &&
+	* next
+	  side
+	  side2
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'multiple branch --merged' '
+	git branch --merged next --merged master >actual &&
+	cat >expect <<-\EOF &&
+	  master
+	* next
+	  side
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'multiple branch --no-contains' '
+	git branch --no-contains side --no-contains side2 >actual &&
+	cat >expect <<-\EOF &&
+	  master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'multiple branch --no-merged' '
+	git branch --no-merged next --no-merged master >actual &&
+	cat >expect <<-\EOF &&
+	  side2
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'branch --contains combined with --no-contains' '
+	git checkout -b seen master &&
+	git merge side &&
+	git merge side2 &&
+	git branch --contains side --no-contains side2 >actual &&
+	cat >expect <<-\EOF &&
+	  next
+	  side
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'branch --merged combined with --no-merged' '
+	git branch --merged seen --no-merged next >actual &&
+	cat >expect <<-\EOF &&
+	* seen
+	  side2
+	EOF
+	test_cmp expect actual
+'
+
 # We want to set up a case where the walk for the tracking info
 # of one branch crosses the tip of another branch (and make sure
 # that the latter walk does not mess up our flag to see if it was
@@ -200,15 +263,4 @@
 	test_i18ncmp expect actual
 '
 
-test_expect_success 'branch --contains combined with --no-contains' '
-	git branch --contains zzz --no-contains topic >actual &&
-	cat >expect <<-\EOF &&
-	  master
-	  side
-	  zzz
-	EOF
-	test_cmp expect actual
-
-'
-
 test_done
diff --git a/t/t3206-range-diff.sh b/t/t3206-range-diff.sh
index e024cff..6eb344b 100755
--- a/t/t3206-range-diff.sh
+++ b/t/t3206-range-diff.sh
@@ -252,17 +252,13 @@
 	git range-diff --no-color --stat topic...changed >actual &&
 	cat >expect <<-EOF &&
 	1:  $(test_oid t1) = 1:  $(test_oid c1) s/5/A/
-	     a => b | 0
-	     1 file changed, 0 insertions(+), 0 deletions(-)
 	2:  $(test_oid t2) = 2:  $(test_oid c2) s/4/A/
-	     a => b | 0
-	     1 file changed, 0 insertions(+), 0 deletions(-)
 	3:  $(test_oid t3) ! 3:  $(test_oid c3) s/11/B/
-	     a => b | 0
-	     1 file changed, 0 insertions(+), 0 deletions(-)
+	     a => b | 2 +-
+	     1 file changed, 1 insertion(+), 1 deletion(-)
 	4:  $(test_oid t4) ! 4:  $(test_oid c4) s/12/B/
-	     a => b | 0
-	     1 file changed, 0 insertions(+), 0 deletions(-)
+	     a => b | 2 +-
+	     1 file changed, 1 insertion(+), 1 deletion(-)
 	EOF
 	test_cmp expect actual
 '
diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 1590cf6..ca04fac 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -822,6 +822,44 @@
 	test_cmp expect a
 '
 
+# This should be called from a subshell as it sets a temporary editor
+setup_new_file() {
+	write_script new-file-editor.sh <<-\EOF &&
+	sed /^#/d "$1" >patch &&
+	sed /^+c/d patch >"$1"
+	EOF
+	test_set_editor "$(pwd)/new-file-editor.sh" &&
+	test_write_lines a b c d e f >new-file &&
+	test_write_lines a b d e f >new-file-expect &&
+	test_write_lines "@@ -0,0 +1,6 @@" +a +b +c +d +e +f >patch-expect
+}
+
+test_expect_success 'add -N followed by add -p patch editing' '
+	git reset --hard &&
+	(
+		setup_new_file &&
+		git add -N new-file &&
+		test_write_lines e n q | git add -p &&
+		git cat-file blob :new-file >actual &&
+		test_cmp new-file-expect actual &&
+		test_cmp patch-expect patch
+	)
+'
+
+test_expect_success 'checkout -p patch editing of added file' '
+	git reset --hard &&
+	(
+		setup_new_file &&
+		git add new-file &&
+		git commit -m "add new file" &&
+		git rm new-file &&
+		git commit -m "remove new file" &&
+		test_write_lines e n q | git checkout -p HEAD^ &&
+		test_cmp new-file-expect new-file &&
+		test_cmp patch-expect patch
+	)
+'
+
 test_expect_success 'show help from add--helper' '
 	git reset --hard &&
 	cat >expect <<-EOF &&
diff --git a/t/t4201-shortlog.sh b/t/t4201-shortlog.sh
index d3a7ce6..3d5c4a2 100755
--- a/t/t4201-shortlog.sh
+++ b/t/t4201-shortlog.sh
@@ -215,4 +215,145 @@
 	test_cmp expect actual
 '
 
+test_expect_success '--group=committer is the same as --committer' '
+	git shortlog -ns --group=committer HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shortlog --group=trailer:signed-off-by' '
+	git commit --allow-empty -m foo -s &&
+	GIT_COMMITTER_NAME="SOB One" \
+	GIT_COMMITTER_EMAIL=sob@example.com \
+		git commit --allow-empty -m foo -s &&
+	git commit --allow-empty --amend --no-edit -s &&
+	cat >expect <<-\EOF &&
+	     2	C O Mitter <committer@example.com>
+	     1	SOB One <sob@example.com>
+	EOF
+	git shortlog -nse --group=trailer:signed-off-by HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'trailer idents are split' '
+	cat >expect <<-\EOF &&
+	     2	C O Mitter
+	     1	SOB One
+	EOF
+	git shortlog -ns --group=trailer:signed-off-by HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'trailer idents are mailmapped' '
+	cat >expect <<-\EOF &&
+	     2	C O Mitter
+	     1	Another Name
+	EOF
+	echo "Another Name <sob@example.com>" >mail.map &&
+	git -c mailmap.file=mail.map shortlog -ns \
+		--group=trailer:signed-off-by HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shortlog de-duplicates trailers in a single commit' '
+	git commit --allow-empty -F - <<-\EOF &&
+	subject one
+
+	this message has two distinct values, plus a repeat
+
+	Repeated-trailer: Foo
+	Repeated-trailer: Bar
+	Repeated-trailer: Foo
+	EOF
+
+	git commit --allow-empty -F - <<-\EOF &&
+	subject two
+
+	similar to the previous, but without the second distinct value
+
+	Repeated-trailer: Foo
+	Repeated-trailer: Foo
+	EOF
+
+	cat >expect <<-\EOF &&
+	     2	Foo
+	     1	Bar
+	EOF
+	git shortlog -ns --group=trailer:repeated-trailer -2 HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'shortlog can match multiple groups' '
+	git commit --allow-empty -F - <<-\EOF &&
+	subject one
+
+	this has two trailers that are distinct from the author; it will count
+	3 times in the output
+
+	Some-trailer: User A <a@example.com>
+	Another-trailer: User B <b@example.com>
+	EOF
+
+	git commit --allow-empty -F - <<-\EOF &&
+	subject two
+
+	this one has two trailers, one of which is a duplicate with the author;
+	it will only be counted once for them
+
+	Another-trailer: A U Thor <author@example.com>
+	Some-trailer: User B <b@example.com>
+	EOF
+
+	cat >expect <<-\EOF &&
+	     2	A U Thor
+	     2	User B
+	     1	User A
+	EOF
+	git shortlog -ns \
+		--group=author \
+		--group=trailer:some-trailer \
+		--group=trailer:another-trailer \
+		-2 HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'set up option selection tests' '
+	git commit --allow-empty -F - <<-\EOF
+	subject
+
+	body
+
+	Trailer-one: value-one
+	Trailer-two: value-two
+	EOF
+'
+
+test_expect_success '--no-group resets group list to author' '
+	cat >expect <<-\EOF &&
+	     1	A U Thor
+	EOF
+	git shortlog -ns \
+		--group=committer \
+		--group=trailer:trailer-one \
+		--no-group \
+		-1 HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--no-group resets trailer list' '
+	cat >expect <<-\EOF &&
+	     1	value-two
+	EOF
+	git shortlog -ns \
+		--group=trailer:trailer-one \
+		--no-group \
+		--group=trailer:trailer-two \
+		-1 HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin with multiple groups reports error' '
+	git log >log &&
+	test_must_fail git shortlog --group=author --group=committer <log
+'
+
 test_done
diff --git a/t/t4216-log-bloom.sh b/t/t4216-log-bloom.sh
index 4bb9e9d..d11040c 100755
--- a/t/t4216-log-bloom.sh
+++ b/t/t4216-log-bloom.sh
@@ -30,6 +30,7 @@
 	rm file_to_be_deleted &&
 	git add . &&
 	git commit -m "file removed" &&
+	git commit --allow-empty -m "empty" &&
 	git commit-graph write --reachable --changed-paths &&
 
 	test_oid_cache <<-EOF
@@ -37,6 +38,7 @@
 	oid_version sha256:2
 	EOF
 '
+
 graph_read_expect () {
 	NUM_CHUNKS=5
 	cat >expect <<- EOF
@@ -49,7 +51,7 @@
 }
 
 test_expect_success 'commit-graph write wrote out the bloom chunks' '
-	graph_read_expect 15
+	graph_read_expect 16
 '
 
 # Turn off any inherited trace2 settings for this test.
@@ -58,14 +60,14 @@
 sane_unset GIT_TRACE2_CONFIG_PARAMS
 
 setup () {
-	rm "$TRASH_DIRECTORY/trace.perf"
+	rm -f "$TRASH_DIRECTORY/trace.perf" &&
 	git -c core.commitGraph=false log --pretty="format:%s" $1 >log_wo_bloom &&
 	GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.perf" git -c core.commitGraph=true log --pretty="format:%s" $1 >log_w_bloom
 }
 
 test_bloom_filters_used () {
 	log_args=$1
-	bloom_trace_prefix="statistics:{\"filter_not_present\":0,\"maybe\""
+	bloom_trace_prefix="statistics:{\"filter_not_present\":${2:-0},\"maybe\""
 	setup "$log_args" &&
 	grep -q "$bloom_trace_prefix" "$TRASH_DIRECTORY/trace.perf" &&
 	test_cmp log_wo_bloom log_w_bloom &&
@@ -95,7 +97,9 @@
 		      "--ancestry-path side..master"
 	do
 		test_expect_success "git log option: $option for path: $path" '
-			test_bloom_filters_used "$option -- $path"
+			test_bloom_filters_used "$option -- $path" &&
+			test_config commitgraph.readChangedPaths false &&
+			test_bloom_filters_not_used "$option -- $path"
 		'
 	done
 done
@@ -139,8 +143,11 @@
 	test_line_count = 2 .git/objects/info/commit-graphs/commit-graph-chain
 '
 
-test_expect_success 'Do not use Bloom filters if the latest graph does not have Bloom filters.' '
-	test_bloom_filters_not_used "-- A/B"
+test_expect_success 'use Bloom filters even if the latest graph does not have Bloom filters' '
+	# Ensure that the number of empty filters is equal to the number of
+	# filters in the latest graph layer to prove that they are loaded (and
+	# ignored).
+	test_bloom_filters_used "-- A/B" 3
 '
 
 test_expect_success 'setup - add commit-graph to the chain with Bloom filters' '
@@ -151,7 +158,7 @@
 
 test_bloom_filters_used_when_some_filters_are_missing () {
 	log_args=$1
-	bloom_trace_prefix="statistics:{\"filter_not_present\":3,\"maybe\":6,\"definitely_not\":8"
+	bloom_trace_prefix="statistics:{\"filter_not_present\":3,\"maybe\":6,\"definitely_not\":9"
 	setup "$log_args" &&
 	grep -q "$bloom_trace_prefix" "$TRASH_DIRECTORY/trace.perf" &&
 	test_cmp log_wo_bloom log_w_bloom
@@ -169,31 +176,230 @@
 		GIT_TEST_BLOOM_SETTINGS_NUM_HASHES=9 \
 		GIT_TEST_BLOOM_SETTINGS_BITS_PER_ENTRY=15 \
 		git commit-graph write --reachable --changed-paths &&
-	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15}" trace2.txt &&
+	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15,\"max_changed_paths\":512" trace2.txt &&
 	GIT_TRACE2_EVENT="$(pwd)/trace2-auto.txt" \
 		GIT_TRACE2_EVENT_NESTING=5 \
 		git commit-graph write --reachable --changed-paths &&
-	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15}" trace2-auto.txt
+	grep "{\"hash_version\":1,\"num_hashes\":9,\"bits_per_entry\":15,\"max_changed_paths\":512" trace2-auto.txt
 '
 
+test_max_changed_paths () {
+	grep "\"max_changed_paths\":$1" $2
+}
+
+test_filter_not_computed () {
+	grep "\"key\":\"filter-not-computed\",\"value\":\"$1\"" $2
+}
+
+test_filter_computed () {
+	grep "\"key\":\"filter-computed\",\"value\":\"$1\"" $2
+}
+
+test_filter_trunc_empty () {
+	grep "\"key\":\"filter-trunc-empty\",\"value\":\"$1\"" $2
+}
+
+test_filter_trunc_large () {
+	grep "\"key\":\"filter-trunc-large\",\"value\":\"$1\"" $2
+}
+
 test_expect_success 'correctly report changes over limit' '
-	git init 513changes &&
+	git init limits &&
 	(
-		cd 513changes &&
-		for i in $(test_seq 1 513)
+		cd limits &&
+		mkdir d &&
+		mkdir d/e &&
+
+		for i in $(test_seq 1 2)
 		do
-			echo $i >file$i.txt || return 1
+			printf $i >d/file$i.txt &&
+			printf $i >d/e/file$i.txt || return 1
 		done &&
-		git add . &&
+
+		mkdir mode &&
+		printf bash >mode/script.sh &&
+
+		mkdir foo &&
+		touch foo/bar &&
+		touch foo.txt &&
+
+		git add d foo foo.txt mode &&
 		git commit -m "files" &&
-		git commit-graph write --reachable --changed-paths &&
-		for i in $(test_seq 1 513)
+
+		# Commit has 7 file and 4 directory adds
+		GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS=10 \
+			GIT_TRACE2_EVENT="$(pwd)/trace" \
+			git commit-graph write --reachable --changed-paths &&
+		test_max_changed_paths 10 trace &&
+		test_filter_computed 1 trace &&
+		test_filter_trunc_large 1 trace &&
+
+		for path in $(git ls-tree -r --name-only HEAD)
 		do
-			git -c core.commitGraph=false log -- file$i.txt >expect &&
-			git log -- file$i.txt >actual &&
+			git -c commitGraph.readChangedPaths=false log \
+				-- $path >expect &&
+			git log -- $path >actual &&
+			test_cmp expect actual || return 1
+		done &&
+
+		# Make a variety of path changes
+		printf new1 >d/e/file1.txt &&
+		printf new2 >d/file2.txt &&
+		rm d/e/file2.txt &&
+		rm -r foo &&
+		printf text >foo &&
+		mkdir f &&
+		printf new1 >f/file1.txt &&
+
+		# including a mode-only change (counts as modified)
+		git update-index --chmod=+x mode/script.sh &&
+
+		git add foo d f &&
+		git commit -m "complicated" &&
+
+		# start from scratch and rebuild
+		rm -f .git/objects/info/commit-graph &&
+		GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS=10 \
+			GIT_TRACE2_EVENT="$(pwd)/trace-edit" \
+			git commit-graph write --reachable --changed-paths &&
+		test_max_changed_paths 10 trace-edit &&
+		test_filter_computed 2 trace-edit &&
+		test_filter_trunc_large 2 trace-edit &&
+
+		for path in $(git ls-tree -r --name-only HEAD)
+		do
+			git -c commitGraph.readChangedPaths=false log \
+				-- $path >expect &&
+			git log -- $path >actual &&
+			test_cmp expect actual || return 1
+		done &&
+
+		# start from scratch and rebuild
+		rm -f .git/objects/info/commit-graph &&
+		GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS=11 \
+			GIT_TRACE2_EVENT="$(pwd)/trace-update" \
+			git commit-graph write --reachable --changed-paths &&
+		test_max_changed_paths 11 trace-update &&
+		test_filter_computed 2 trace-update &&
+		test_filter_trunc_large 0 trace-update &&
+
+		for path in $(git ls-tree -r --name-only HEAD)
+		do
+			git -c commitGraph.readChangedPaths=false log \
+				-- $path >expect &&
+			git log -- $path >actual &&
 			test_cmp expect actual || return 1
 		done
 	)
 '
 
+test_expect_success 'correctly report commits with no changed paths' '
+	git init empty &&
+	test_when_finished "rm -fr empty" &&
+	(
+		cd empty &&
+
+		git commit --allow-empty -m "initial commit" &&
+
+		GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+			git commit-graph write --reachable --changed-paths &&
+		test_filter_computed 1 trace.event &&
+		test_filter_not_computed 0 trace.event &&
+		test_filter_trunc_empty 1 trace.event &&
+		test_filter_trunc_large 0 trace.event
+	)
+'
+
+test_expect_success 'Bloom generation is limited by --max-new-filters' '
+	(
+		cd limits &&
+		test_commit c2 filter &&
+		test_commit c3 filter &&
+		test_commit c4 no-filter &&
+
+		rm -f trace.event &&
+		GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+			git commit-graph write --reachable --split=replace \
+				--changed-paths --max-new-filters=2 &&
+
+		test_filter_computed 2 trace.event &&
+		test_filter_not_computed 3 trace.event &&
+		test_filter_trunc_empty 0 trace.event &&
+		test_filter_trunc_large 0 trace.event
+	)
+'
+
+test_expect_success 'Bloom generation backfills previously-skipped filters' '
+	# Check specifying commitGraph.maxNewFilters over "git config" works.
+	test_config -C limits commitGraph.maxNewFilters 1 &&
+	(
+		cd limits &&
+
+		rm -f trace.event &&
+		GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+			git commit-graph write --reachable --changed-paths \
+				--split=replace &&
+		test_filter_computed 1 trace.event &&
+		test_filter_not_computed 4 trace.event &&
+		test_filter_trunc_empty 0 trace.event &&
+		test_filter_trunc_large 0 trace.event
+	)
+'
+
+test_expect_success '--max-new-filters overrides configuration' '
+	git init override &&
+	test_when_finished "rm -fr override" &&
+	test_config -C override commitGraph.maxNewFilters 2 &&
+	(
+		cd override &&
+		test_commit one &&
+		test_commit two &&
+
+		rm -f trace.event &&
+		GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+			git commit-graph write --reachable --changed-paths \
+				--max-new-filters=1 &&
+		test_filter_computed 1 trace.event &&
+		test_filter_not_computed 1 trace.event &&
+		test_filter_trunc_empty 0 trace.event &&
+		test_filter_trunc_large 0 trace.event
+	)
+'
+
+test_expect_success 'Bloom generation backfills empty commits' '
+	git init empty &&
+	test_when_finished "rm -fr empty" &&
+	(
+		cd empty &&
+		for i in $(test_seq 1 6)
+		do
+			git commit --allow-empty -m "$i"
+		done &&
+
+		# Generate Bloom filters for empty commits 1-6, two at a time.
+		for i in $(test_seq 1 3)
+		do
+			rm -f trace.event &&
+			GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+				git commit-graph write --reachable \
+					--changed-paths --max-new-filters=2 &&
+			test_filter_computed 2 trace.event &&
+			test_filter_not_computed 4 trace.event &&
+			test_filter_trunc_empty 2 trace.event &&
+			test_filter_trunc_large 0 trace.event
+		done &&
+
+		# Finally, make sure that once all commits have filters, that
+		# none are subsequently recomputed.
+		rm -f trace.event &&
+		GIT_TRACE2_EVENT="$(pwd)/trace.event" \
+			git commit-graph write --reachable \
+				--changed-paths --max-new-filters=2 &&
+		test_filter_computed 0 trace.event &&
+		test_filter_not_computed 6 trace.event &&
+		test_filter_trunc_empty 0 trace.event &&
+		test_filter_trunc_large 0 trace.event
+	)
+'
+
 test_done
diff --git a/t/t5324-split-commit-graph.sh b/t/t5324-split-commit-graph.sh
index 1821646..c334ee9 100755
--- a/t/t5324-split-commit-graph.sh
+++ b/t/t5324-split-commit-graph.sh
@@ -427,4 +427,17 @@
 0600 -r--------
 EOF
 
+test_expect_success '--split=replace with partial Bloom data' '
+	rm -rf $graphdir $infodir/commit-graph &&
+	git reset --hard commits/3 &&
+	git rev-list -1 HEAD~2 >a &&
+	git rev-list -1 HEAD~1 >b &&
+	git commit-graph write --split=no-merge --stdin-commits --changed-paths <a &&
+	git commit-graph write --split=no-merge --stdin-commits <b &&
+	git commit-graph write --split=replace --stdin-commits --changed-paths <c &&
+	ls $graphdir/graph-*.graph >graph-files &&
+	test_line_count = 1 graph-files &&
+	verify_chain_files_exist $graphdir
+'
+
 test_done
diff --git a/t/t5411-proc-receive-hook.sh b/t/t5411-proc-receive-hook.sh
new file mode 100755
index 0000000..7464872
--- /dev/null
+++ b/t/t5411-proc-receive-hook.sh
@@ -0,0 +1,117 @@
+#!/bin/sh
+#
+# Copyright (c) 2020 Jiang Xin
+#
+
+test_description='Test proc-receive hook'
+
+. ./test-lib.sh
+
+. "$TEST_DIRECTORY"/t5411/common-functions.sh
+
+setup_upstream_and_workbench () {
+	# Refs of upstream : master(A)
+	# Refs of workbench: master(A)  tags/v123
+	test_expect_success "setup upstream and workbench" '
+		rm -rf upstream.git &&
+		rm -rf workbench &&
+		git init --bare upstream.git &&
+		git init workbench &&
+		create_commits_in workbench A B &&
+		(
+			cd workbench &&
+			# Try to make a stable fixed width for abbreviated commit ID,
+			# this fixed-width oid will be replaced with "<OID>".
+			git config core.abbrev 7 &&
+			git tag -m "v123" v123 $A &&
+			git remote add origin ../upstream.git &&
+			git push origin master &&
+			git update-ref refs/heads/master $A $B &&
+			git -C ../upstream.git update-ref \
+				refs/heads/master $A $B
+		) &&
+		TAG=$(git -C workbench rev-parse v123) &&
+
+		# setup pre-receive hook
+		write_script upstream.git/hooks/pre-receive <<-\EOF &&
+		exec >&2
+		echo "# pre-receive hook"
+		while read old new ref
+		do
+			echo "pre-receive< $old $new $ref"
+		done
+		EOF
+
+		# setup post-receive hook
+		write_script upstream.git/hooks/post-receive <<-\EOF &&
+		exec >&2
+		echo "# post-receive hook"
+		while read old new ref
+		do
+			echo "post-receive< $old $new $ref"
+		done
+		EOF
+
+		upstream=upstream.git
+	'
+}
+
+run_proc_receive_hook_test() {
+	case $1 in
+	http)
+		PROTOCOL="HTTP protocol"
+		URL_PREFIX="http://.*"
+		;;
+	local)
+		PROTOCOL="builtin protocol"
+		URL_PREFIX="\.\."
+		;;
+	esac
+
+	# Include test cases for both file and HTTP protocol
+	for t in  "$TEST_DIRECTORY"/t5411/test-*.sh
+	do
+		. "$t"
+	done
+}
+
+# Initialize the upstream repository and local workbench.
+setup_upstream_and_workbench
+
+# Load test cases that only need to be executed once.
+for t in  "$TEST_DIRECTORY"/t5411/once-*.sh
+do
+	. "$t"
+done
+
+# Initialize the upstream repository and local workbench.
+setup_upstream_and_workbench
+
+# Run test cases for 'proc-receive' hook on local file protocol.
+run_proc_receive_hook_test local
+
+ROOT_PATH="$PWD"
+. "$TEST_DIRECTORY"/lib-gpg.sh
+. "$TEST_DIRECTORY"/lib-httpd.sh
+. "$TEST_DIRECTORY"/lib-terminal.sh
+start_httpd
+
+# Re-initialize the upstream repository and local workbench.
+setup_upstream_and_workbench
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "setup for HTTP protocol" '
+	git -C upstream.git config http.receivepack true &&
+	upstream="$HTTPD_DOCUMENT_ROOT_PATH/upstream.git" &&
+	mv upstream.git "$upstream" &&
+	git -C workbench remote set-url origin "$HTTPD_URL/auth-push/smart/upstream.git" &&
+	set_askpass user@host pass@host
+'
+
+setup_askpass_helper
+
+# Run test cases for 'proc-receive' hook on HTTP protocol.
+run_proc_receive_hook_test http
+
+test_done
diff --git a/t/t5411/common-functions.sh b/t/t5411/common-functions.sh
new file mode 100644
index 0000000..6580beb
--- /dev/null
+++ b/t/t5411/common-functions.sh
@@ -0,0 +1,56 @@
+# Create commits in <repo> and assign each commit's oid to shell variables
+# given in the arguments (A, B, and C). E.g.:
+#
+#     create_commits_in <repo> A B C
+#
+# NOTE: Never calling this function from a subshell since variable
+# assignments will disappear when subshell exits.
+create_commits_in () {
+	repo="$1" &&
+	if ! parent=$(git -C "$repo" rev-parse HEAD^{} --)
+	then
+		parent=
+	fi &&
+	T=$(git -C "$repo" write-tree) &&
+	shift &&
+	while test $# -gt 0
+	do
+		name=$1 &&
+		test_tick &&
+		if test -z "$parent"
+		then
+			oid=$(echo $name | git -C "$repo" commit-tree $T)
+		else
+			oid=$(echo $name | git -C "$repo" commit-tree -p $parent $T)
+		fi &&
+		eval $name=$oid &&
+		parent=$oid &&
+		shift ||
+		return 1
+	done &&
+	git -C "$repo" update-ref refs/heads/master $oid
+}
+
+# Format the output of git-push, git-show-ref and other commands to make a
+# user-friendly and stable text.  We can easily prepare the expect text
+# without having to worry about future changes of the commit ID and spaces
+# of the output.  Single quotes are replaced with double quotes, because
+# it is boring to prepare unquoted single quotes in expect text.  We also
+# remove some locale error messages, which break test if we turn on
+# `GIT_TEST_GETTEXT_POISON=true` in order to test unintentional translations
+# on plumbing commands.
+make_user_friendly_and_stable_output () {
+	sed \
+		-e "s/  *\$//" \
+		-e "s/   */ /g" \
+		-e "s/'/\"/g" \
+		-e "s/	/    /g" \
+		-e "s/$A/<COMMIT-A>/g" \
+		-e "s/$B/<COMMIT-B>/g" \
+		-e "s/$TAG/<TAG-v123>/g" \
+		-e "s/$ZERO_OID/<ZERO-OID>/g" \
+		-e "s/$(echo $A | cut -c1-7)[0-9a-f]*/<OID-A>/g" \
+		-e "s/$(echo $B | cut -c1-7)[0-9a-f]*/<OID-B>/g" \
+		-e "s#To $URL_PREFIX/upstream.git#To <URL/of/upstream.git>#" \
+		-e "/^error: / d"
+}
diff --git a/t/t5411/once-0010-report-status-v1.sh b/t/t5411/once-0010-report-status-v1.sh
new file mode 100644
index 0000000..dc2cf4a
--- /dev/null
+++ b/t/t5411/once-0010-report-status-v1.sh
@@ -0,0 +1,94 @@
+test_expect_success "setup receive.procReceiveRefs" '
+	git -C "$upstream" config --add receive.procReceiveRefs refs/for
+'
+
+test_expect_success "setup proc-receive hook" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic1" \
+		-r "option fall-through" \
+		-r "ok refs/for/master/topic2" \
+		-r "option refname refs/for/changes/23/123/1" \
+		-r "option new-oid $A" \
+		-r "ok refs/for/master/topic2" \
+		-r "option refname refs/for/changes/24/124/2" \
+		-r "option old-oid $B" \
+		-r "option new-oid $A" \
+		-r "option forced-update" \
+		-r "ng refs/for/next/topic target branch not exist"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         : (B)                   refs/for/master/topic1(A)  foo(A)  refs/for/next/topic(A)  refs/for/master/topic2(A)
+test_expect_success "proc-receive: report status v1" '
+	{
+		if test -z "$GIT_DEFAULT_HASH" || test "$GIT_DEFAULT_HASH" = "sha1"
+		then
+			printf "%s %s refs/heads/master\0report-status\n" \
+				$A $B | packetize
+		else
+			printf "%s %s refs/heads/master\0report-status object-format=$GIT_DEFAULT_HASH\n" \
+				$A $B | packetize
+		fi &&
+		printf "%s %s refs/for/master/topic1\n" \
+			$ZERO_OID $A | packetize &&
+		printf "%s %s refs/heads/foo\n" \
+			$ZERO_OID $A | packetize &&
+		printf "%s %s refs/for/next/topic\n" \
+			$ZERO_OID $A | packetize &&
+		printf "%s %s refs/for/master/topic2\n" \
+			$ZERO_OID $A | packetize &&
+		printf 0000 &&
+		printf "" | git -C "$upstream" pack-objects --stdout
+	} | git receive-pack "$upstream" --stateless-rpc \
+	>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	# pre-receive hook
+	pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic1
+	pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo
+	pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic2
+	# proc-receive hook
+	proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic1
+	proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic2
+	proc-receive> ok refs/for/master/topic1
+	proc-receive> option fall-through
+	proc-receive> ok refs/for/master/topic2
+	proc-receive> option refname refs/for/changes/23/123/1
+	proc-receive> option new-oid <COMMIT-A>
+	proc-receive> ok refs/for/master/topic2
+	proc-receive> option refname refs/for/changes/24/124/2
+	proc-receive> option old-oid <COMMIT-B>
+	proc-receive> option new-oid <COMMIT-A>
+	proc-receive> option forced-update
+	proc-receive> ng refs/for/next/topic target branch not exist
+	000eunpack ok
+	0019ok refs/heads/master
+	001eok refs/for/master/topic1
+	0016ok refs/heads/foo
+	0033ng refs/for/next/topic target branch not exist
+	001eok refs/for/master/topic2
+	0000# post-receive hook
+	post-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	post-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic1
+	post-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo
+	post-receive< <ZERO-OID> <COMMIT-A> refs/for/changes/23/123/1
+	post-receive< <COMMIT-B> <COMMIT-A> refs/for/changes/24/124/2
+	EOF
+	test_cmp expect actual &&
+
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/for/master/topic1
+	<COMMIT-A> refs/heads/foo
+	<COMMIT-B> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0000-standard-git-push.sh b/t/t5411/test-0000-standard-git-push.sh
new file mode 100644
index 0000000..e206587
--- /dev/null
+++ b/t/t5411/test-0000-standard-git-push.sh
@@ -0,0 +1,143 @@
+# Refs of upstream : master(A)  
+# Refs of workbench: master(A)  tags/v123
+# git-push         : master(B)             next(A)
+test_expect_success "git-push ($PROTOCOL)" '
+	git -C workbench push origin \
+		$B:refs/heads/master \
+		HEAD:refs/heads/next \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	To <URL/of/upstream.git>
+	 <OID-A>..<OID-B> <COMMIT-B> -> master
+	 * [new branch] HEAD -> next
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/heads/master
+	<COMMIT-A> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(B)  next(A)
+# Refs of workbench: master(A)           tags/v123
+# git-push --atomic: master(A)  next(B)
+test_expect_success "git-push --atomic ($PROTOCOL)" '
+	test_must_fail git -C workbench push --atomic origin \
+		master \
+		$B:refs/heads/next \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out |
+		sed -n \
+			-e "/^To / { s/   */ /g; p; }" \
+			-e "/^ ! / { s/   */ /g; p; }" \
+			>actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	 ! [rejected] master -> master (non-fast-forward)
+	 ! [rejected] <COMMIT-B> -> next (atomic push failed)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/heads/master
+	<COMMIT-A> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(B)  next(A)
+# Refs of workbench: master(A)           tags/v123
+# git-push         : master(A)  next(B)
+test_expect_success "non-fast-forward git-push ($PROTOCOL)" '
+	test_must_fail git \
+		-C workbench \
+		-c advice.pushUpdateRejected=false \
+		push origin \
+		master \
+		$B:refs/heads/next \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/next
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/next
+	To <URL/of/upstream.git>
+	 <OID-A>..<OID-B> <COMMIT-B> -> next
+	 ! [rejected] master -> master (non-fast-forward)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/heads/master
+	<COMMIT-B> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(B)  next(B)
+# Refs of workbench: master(A)           tags/v123
+# git-push -f      : master(A)  NULL     tags/v123  refs/review/master/topic(A)  a/b/c(A)
+test_expect_success "git-push -f ($PROTOCOL)" '
+	git -C workbench push -f origin \
+		refs/tags/v123 \
+		:refs/heads/next \
+		master \
+		master:refs/review/master/topic \
+		HEAD:refs/heads/a/b/c \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-B> <COMMIT-A> refs/heads/master
+	remote: pre-receive< <COMMIT-B> <ZERO-OID> refs/heads/next
+	remote: pre-receive< <ZERO-OID> <TAG-v123> refs/tags/v123
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/review/master/topic
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/a/b/c
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/heads/master
+	remote: post-receive< <COMMIT-B> <ZERO-OID> refs/heads/next
+	remote: post-receive< <ZERO-OID> <TAG-v123> refs/tags/v123
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/review/master/topic
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/a/b/c
+	To <URL/of/upstream.git>
+	 + <OID-B>...<OID-A> master -> master (forced update)
+	 - [deleted] next
+	 * [new tag] v123 -> v123
+	 * [new reference] master -> refs/review/master/topic
+	 * [new branch] HEAD -> a/b/c
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/a/b/c
+	<COMMIT-A> refs/heads/master
+	<COMMIT-A> refs/review/master/topic
+	<TAG-v123> refs/tags/v123
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)  tags/v123  refs/review/master/topic(A)  a/b/c(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	(
+		cd "$upstream" &&
+		git update-ref -d refs/review/master/topic &&
+		git update-ref -d refs/tags/v123 &&
+		git update-ref -d refs/heads/a/b/c
+	)
+'
diff --git a/t/t5411/test-0001-standard-git-push--porcelain.sh b/t/t5411/test-0001-standard-git-push--porcelain.sh
new file mode 100644
index 0000000..48f6fcc
--- /dev/null
+++ b/t/t5411/test-0001-standard-git-push--porcelain.sh
@@ -0,0 +1,147 @@
+# Refs of upstream : master(A)  
+# Refs of workbench: master(A)  tags/v123
+# git-push         : master(B)             next(A)
+test_expect_success "git-push ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		$B:refs/heads/master \
+		HEAD:refs/heads/next \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	To <URL/of/upstream.git>
+	     <COMMIT-B>:refs/heads/master    <OID-A>..<OID-B>
+	*    HEAD:refs/heads/next    [new branch]
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/heads/master
+	<COMMIT-A> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(B)  next(A)
+# Refs of workbench: master(A)           tags/v123
+# git-push --atomic: master(A)  next(B)
+test_expect_success "git-push --atomic ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --atomic --porcelain origin \
+		master \
+		$B:refs/heads/next \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out |
+		sed -n \
+			-e "s/^# GETTEXT POISON #//" \
+			-e "/^To / { s/   */ /g; p; }" \
+			-e "/^! / { s/   */ /g; p; }" \
+			>actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	! refs/heads/master:refs/heads/master [rejected] (non-fast-forward)
+	! <COMMIT-B>:refs/heads/next [rejected] (atomic push failed)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/heads/master
+	<COMMIT-A> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(B)  next(A)
+# Refs of workbench: master(A)           tags/v123
+# git-push         : master(A)  next(B)
+test_expect_success "non-fast-forward git-push ($PROTOCOL/porcelain)" '
+	test_must_fail git \
+		-C workbench \
+		-c advice.pushUpdateRejected=false \
+		push --porcelain origin \
+		master \
+		$B:refs/heads/next \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/next
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/next
+	To <URL/of/upstream.git>
+	     <COMMIT-B>:refs/heads/next    <OID-A>..<OID-B>
+	!    refs/heads/master:refs/heads/master    [rejected] (non-fast-forward)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/heads/master
+	<COMMIT-B> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(B)  next(B)
+# Refs of workbench: master(A)           tags/v123
+# git-push -f      : master(A)  NULL     tags/v123  refs/review/master/topic(A)  a/b/c(A)
+test_expect_success "git-push -f ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain -f origin \
+		refs/tags/v123 \
+		:refs/heads/next \
+		master \
+		master:refs/review/master/topic \
+		HEAD:refs/heads/a/b/c \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-B> <COMMIT-A> refs/heads/master
+	remote: pre-receive< <COMMIT-B> <ZERO-OID> refs/heads/next
+	remote: pre-receive< <ZERO-OID> <TAG-v123> refs/tags/v123
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/review/master/topic
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/a/b/c
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/heads/master
+	remote: post-receive< <COMMIT-B> <ZERO-OID> refs/heads/next
+	remote: post-receive< <ZERO-OID> <TAG-v123> refs/tags/v123
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/review/master/topic
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/a/b/c
+	To <URL/of/upstream.git>
+	+    refs/heads/master:refs/heads/master    <OID-B>...<OID-A> (forced update)
+	-    :refs/heads/next    [deleted]
+	*    refs/tags/v123:refs/tags/v123    [new tag]
+	*    refs/heads/master:refs/review/master/topic    [new reference]
+	*    HEAD:refs/heads/a/b/c    [new branch]
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/a/b/c
+	<COMMIT-A> refs/heads/master
+	<COMMIT-A> refs/review/master/topic
+	<TAG-v123> refs/tags/v123
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)  tags/v123  refs/review/master/topic(A)  a/b/c(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	(
+		cd "$upstream" &&
+		git update-ref -d refs/review/master/topic &&
+		git update-ref -d refs/tags/v123 &&
+		git update-ref -d refs/heads/a/b/c
+	)
+'
diff --git a/t/t5411/test-0002-pre-receive-declined.sh b/t/t5411/test-0002-pre-receive-declined.sh
new file mode 100644
index 0000000..c246f7e
--- /dev/null
+++ b/t/t5411/test-0002-pre-receive-declined.sh
@@ -0,0 +1,33 @@
+test_expect_success "setup pre-receive hook ($PROTOCOL)" '
+	mv "$upstream/hooks/pre-receive" "$upstream/hooks/pre-receive.ok" &&
+	write_script "$upstream/hooks/pre-receive" <<-EOF
+	exit 1
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git-push         : master(B)             next(A)
+test_expect_success "git-push is declined ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		$B:refs/heads/master \
+		HEAD:refs/heads/next \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	 ! [remote rejected] <COMMIT-B> -> master (pre-receive hook declined)
+	 ! [remote rejected] HEAD -> next (pre-receive hook declined)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "cleanup ($PROTOCOL)" '
+	mv "$upstream/hooks/pre-receive.ok" "$upstream/hooks/pre-receive"
+'
diff --git a/t/t5411/test-0003-pre-receive-declined--porcelain.sh b/t/t5411/test-0003-pre-receive-declined--porcelain.sh
new file mode 100644
index 0000000..b14894d
--- /dev/null
+++ b/t/t5411/test-0003-pre-receive-declined--porcelain.sh
@@ -0,0 +1,34 @@
+test_expect_success "setup pre-receive hook ($PROTOCOL/porcelain)" '
+	mv "$upstream/hooks/pre-receive" "$upstream/hooks/pre-receive.ok" &&
+	write_script "$upstream/hooks/pre-receive" <<-EOF
+	exit 1
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git-push         : master(B)             next(A)
+test_expect_success "git-push is declined ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		$B:refs/heads/master \
+		HEAD:refs/heads/next \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	!    <COMMIT-B>:refs/heads/master    [remote rejected] (pre-receive hook declined)
+	!    HEAD:refs/heads/next    [remote rejected] (pre-receive hook declined)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	mv "$upstream/hooks/pre-receive.ok" "$upstream/hooks/pre-receive"
+'
diff --git a/t/t5411/test-0010-proc-receive-settings.sh b/t/t5411/test-0010-proc-receive-settings.sh
new file mode 100644
index 0000000..a368099
--- /dev/null
+++ b/t/t5411/test-0010-proc-receive-settings.sh
@@ -0,0 +1,7 @@
+test_expect_success "add two receive.procReceiveRefs settings" '
+	(
+		cd "$upstream" &&
+		git config --add receive.procReceiveRefs refs/for &&
+		git config --add receive.procReceiveRefs refs/review/
+	)
+'
diff --git a/t/t5411/test-0011-no-hook-error.sh b/t/t5411/test-0011-no-hook-error.sh
new file mode 100644
index 0000000..bb6ec92
--- /dev/null
+++ b/t/t5411/test-0011-no-hook-error.sh
@@ -0,0 +1,64 @@
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       next(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: no hook, fail to push special ref ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:next \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: error: cannot find hook "proc-receive"
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	To <URL/of/upstream.git>
+	 * [new branch] HEAD -> next
+	 ! [remote rejected] HEAD -> refs/for/master/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	<COMMIT-A> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)             next(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push --atomic: (B)                   next(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: no hook, all failed for atomic push ($PROTOCOL)" '
+	test_must_fail git -C workbench push --atomic origin \
+		$B:master \
+		HEAD:next \
+		HEAD:refs/for/master/topic >out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: error: cannot find hook "proc-receive"
+	To <URL/of/upstream.git>
+	 ! [remote rejected] <COMMIT-B> -> master (fail to run proc-receive hook)
+	 ! [remote rejected] HEAD -> next (fail to run proc-receive hook)
+	 ! [remote rejected] HEAD -> refs/for/master/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0012-no-hook-error--porcelain.sh b/t/t5411/test-0012-no-hook-error--porcelain.sh
new file mode 100644
index 0000000..4814f74
--- /dev/null
+++ b/t/t5411/test-0012-no-hook-error--porcelain.sh
@@ -0,0 +1,66 @@
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       next(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: no hook, fail to push special ref ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:next \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: error: cannot find hook "proc-receive"
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	To <URL/of/upstream.git>
+	*    HEAD:refs/heads/next    [new branch]
+	!    HEAD:refs/for/master/topic    [remote rejected] (fail to run proc-receive hook)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	<COMMIT-A> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)             next(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push --atomic: (B)                   next(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: no hook, all failed for atomic push ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain --atomic origin \
+		$B:master \
+		HEAD:next \
+		HEAD:refs/for/master/topic >out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: error: cannot find hook "proc-receive"
+	To <URL/of/upstream.git>
+	!    <COMMIT-B>:refs/heads/master    [remote rejected] (fail to run proc-receive hook)
+	!    HEAD:refs/heads/next    [remote rejected] (fail to run proc-receive hook)
+	!    HEAD:refs/for/master/topic    [remote rejected] (fail to run proc-receive hook)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0013-bad-protocol.sh b/t/t5411/test-0013-bad-protocol.sh
new file mode 100644
index 0000000..c5fe4cb
--- /dev/null
+++ b/t/t5411/test-0013-bad-protocol.sh
@@ -0,0 +1,217 @@
+test_expect_success "setup proc-receive hook (unknown version, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --version 2
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(A)
+test_expect_success "proc-receive: bad protocol (unknown version, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+
+	# Check status report for git-push
+	sed -n \
+		-e "/^To / { p; n; p; }" \
+		<actual >actual-report &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/master/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual-report &&
+
+	# Check error message from "receive-pack", but ignore unstable fatal error
+	# message ("remote: fatal: the remote end hung up unexpectedly") which
+	# is different from the remote HTTP server with different locale settings.
+	grep "^remote: error:" <actual >actual-error &&
+	cat >expect <<-EOF &&
+	remote: error: proc-receive version "2" is not supported
+	EOF
+	test_cmp expect actual-error &&
+
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (hook --die-version, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-version
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-version, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: fatal: bad protocol version: 1
+	remote: error: proc-receive version "0" is not supported
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/master/topic (fail to run proc-receive hook)
+	EOF
+	test_cmp expect actual &&
+
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (hook --die-readline, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --die-readline
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(A)
+test_expect_success "proc-receive: bad protocol (hook --die-readline, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+
+	grep "remote: fatal: protocol error: expected \"old new ref\", got \"<ZERO-OID> <COMMIT-A> refs/for/master/topic\"" actual &&
+
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (no report, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       next(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: bad protocol (no report, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/heads/next \
+		HEAD:refs/for/master/topic >out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	To <URL/of/upstream.git>
+	 * [new branch] HEAD -> next
+	 ! [remote rejected] HEAD -> refs/for/master/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	<COMMIT-A> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)             next(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+
+'
+
+test_expect_success "setup proc-receive hook (no ref, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic
+test_expect_success "proc-receive: bad protocol (no ref, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/master/topic\
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok
+	remote: error: proc-receive reported incomplete status line: "ok"
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/master/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (unknown status, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "xx refs/for/master/topic"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic
+test_expect_success "proc-receive: bad protocol (unknown status, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+			HEAD:refs/for/master/topic \
+			>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> xx refs/for/master/topic
+	remote: error: proc-receive reported bad status "xx" on ref "refs/for/master/topic"
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/master/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0014-bad-protocol--porcelain.sh b/t/t5411/test-0014-bad-protocol--porcelain.sh
new file mode 100644
index 0000000..53b47b0
--- /dev/null
+++ b/t/t5411/test-0014-bad-protocol--porcelain.sh
@@ -0,0 +1,160 @@
+test_expect_success "setup proc-receive hook (unknown version, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v --version 2
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(A)
+test_expect_success "proc-receive: bad protocol (unknown version, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+
+	# Check status report for git-push
+	sed -n \
+		-e "/^To / { p; n; p; n; p; }" \
+		<actual >actual-report &&
+	cat >expect <<-EOF &&
+	To <URL/of/upstream.git>
+	!    HEAD:refs/for/master/topic    [remote rejected] (fail to run proc-receive hook)
+	Done
+	EOF
+	test_cmp expect actual-report &&
+
+	# Check error message from "receive-pack", but ignore unstable fatal error
+	# message ("remote: fatal: the remote end hung up unexpectedly") which
+	# is different from the remote HTTP server with different locale settings.
+	grep "^remote: error:" <actual >actual-error &&
+	cat >expect <<-EOF &&
+	remote: error: proc-receive version "2" is not supported
+	EOF
+	test_cmp expect actual-error &&
+
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (no report, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       next(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: bad protocol (no report, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/heads/next \
+		HEAD:refs/for/master/topic >out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	To <URL/of/upstream.git>
+	*    HEAD:refs/heads/next    [new branch]
+	!    HEAD:refs/for/master/topic    [remote rejected] (proc-receive failed to report status)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	<COMMIT-A> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)             next(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+
+'
+
+test_expect_success "setup proc-receive hook (no ref, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic
+test_expect_success "proc-receive: bad protocol (no ref, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic\
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok
+	remote: error: proc-receive reported incomplete status line: "ok"
+	To <URL/of/upstream.git>
+	!    HEAD:refs/for/master/topic    [remote rejected] (proc-receive failed to report status)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (unknown status, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "xx refs/for/master/topic"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic
+test_expect_success "proc-receive: bad protocol (unknown status, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+			HEAD:refs/for/master/topic \
+			>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> xx refs/for/master/topic
+	remote: error: proc-receive reported bad status "xx" on ref "refs/for/master/topic"
+	To <URL/of/upstream.git>
+	!    HEAD:refs/for/master/topic    [remote rejected] (proc-receive failed to report status)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0020-report-ng.sh b/t/t5411/test-0020-report-ng.sh
new file mode 100644
index 0000000..f726b7c
--- /dev/null
+++ b/t/t5411/test-0020-report-ng.sh
@@ -0,0 +1,67 @@
+test_expect_success "setup proc-receive hook (ng, no message, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ng refs/for/master/topic"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic
+test_expect_success "proc-receive: fail to update (ng, no message, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ng refs/for/master/topic
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/master/topic (failed)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (ng message, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ng refs/for/master/topic error msg"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic
+test_expect_success "proc-receive: fail to update (ng, with message, $PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ng refs/for/master/topic error msg
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/master/topic (error msg)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0021-report-ng--porcelain.sh b/t/t5411/test-0021-report-ng--porcelain.sh
new file mode 100644
index 0000000..fbf5569
--- /dev/null
+++ b/t/t5411/test-0021-report-ng--porcelain.sh
@@ -0,0 +1,69 @@
+test_expect_success "setup proc-receive hook (ng, no message, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ng refs/for/master/topic"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic
+test_expect_success "proc-receive: fail to update (ng, no message, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ng refs/for/master/topic
+	To <URL/of/upstream.git>
+	!    HEAD:refs/for/master/topic    [remote rejected] (failed)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (ng message, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ng refs/for/master/topic error msg"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic
+test_expect_success "proc-receive: fail to update (ng, with message, $PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ng refs/for/master/topic error msg
+	To <URL/of/upstream.git>
+	!    HEAD:refs/for/master/topic    [remote rejected] (error msg)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0022-report-unexpect-ref.sh b/t/t5411/test-0022-report-unexpect-ref.sh
new file mode 100644
index 0000000..92a415b
--- /dev/null
+++ b/t/t5411/test-0022-report-unexpect-ref.sh
@@ -0,0 +1,45 @@
+test_expect_success "setup proc-receive hook (unexpected ref, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/master"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         : (B)                   refs/for/master/topic
+test_expect_success "proc-receive: report unexpected ref ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		$B:refs/heads/master \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/heads/master
+	remote: error: proc-receive reported status on unexpected ref: refs/heads/master
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	To <URL/of/upstream.git>
+	 <OID-A>..<OID-B> <COMMIT-B> -> master
+	 ! [remote rejected] HEAD -> refs/for/master/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(B)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	git -C "$upstream" update-ref refs/heads/master $A
+'
diff --git a/t/t5411/test-0023-report-unexpect-ref--porcelain.sh b/t/t5411/test-0023-report-unexpect-ref--porcelain.sh
new file mode 100644
index 0000000..acbf93e
--- /dev/null
+++ b/t/t5411/test-0023-report-unexpect-ref--porcelain.sh
@@ -0,0 +1,46 @@
+test_expect_success "setup proc-receive hook (unexpected ref, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/master"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         : (B)                   refs/for/master/topic
+test_expect_success "proc-receive: report unexpected ref ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		$B:refs/heads/master \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/heads/master
+	remote: error: proc-receive reported status on unexpected ref: refs/heads/master
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	To <URL/of/upstream.git>
+	     <COMMIT-B>:refs/heads/master    <OID-A>..<OID-B>
+	!    HEAD:refs/for/master/topic    [remote rejected] (proc-receive failed to report status)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(B)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	git -C "$upstream" update-ref refs/heads/master $A
+'
diff --git a/t/t5411/test-0024-report-unknown-ref.sh b/t/t5411/test-0024-report-unknown-ref.sh
new file mode 100644
index 0000000..c3946f3
--- /dev/null
+++ b/t/t5411/test-0024-report-unknown-ref.sh
@@ -0,0 +1,34 @@
+test_expect_success "setup proc-receive hook (unexpected ref, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/a/b/c/my/topic
+test_expect_success "proc-receive: report unknown reference ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/a/b/c/my/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/my/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/my/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: error: proc-receive reported status on unknown ref: refs/for/master/topic
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/a/b/c/my/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0025-report-unknown-ref--porcelain.sh b/t/t5411/test-0025-report-unknown-ref--porcelain.sh
new file mode 100644
index 0000000..d093b1a
--- /dev/null
+++ b/t/t5411/test-0025-report-unknown-ref--porcelain.sh
@@ -0,0 +1,35 @@
+test_expect_success "setup proc-receive hook (unexpected ref, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/a/b/c/my/topic
+test_expect_success "proc-receive: report unknown reference ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/a/b/c/my/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/my/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/my/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: error: proc-receive reported status on unknown ref: refs/for/master/topic
+	To <URL/of/upstream.git>
+	!    HEAD:refs/for/a/b/c/my/topic    [remote rejected] (proc-receive failed to report status)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0026-push-options.sh b/t/t5411/test-0026-push-options.sh
new file mode 100644
index 0000000..d0c4da8
--- /dev/null
+++ b/t/t5411/test-0026-push-options.sh
@@ -0,0 +1,79 @@
+test_expect_success "setup proc-receive hook and disable push-options ($PROTOCOL)" '
+	git -C "$upstream" config receive.advertisePushOptions false &&
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push -o ...  :                       refs/for/master/topic
+test_expect_success "proc-receive: not support push options ($PROTOCOL)" '
+	test_must_fail git -C workbench push \
+		-o issue=123 \
+		-o reviewer=user1 \
+		origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	test_i18ngrep "fatal: the receiving end does not support push options" \
+		actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "enable push options ($PROTOCOL)" '
+	git -C "$upstream" config receive.advertisePushOptions true
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push -o ...  :                       next(A)  refs/for/master/topic
+test_expect_success "proc-receive: push with options ($PROTOCOL)" '
+	git -C workbench push \
+		--atomic \
+		-o issue=123 \
+		-o reviewer=user1 \
+		origin \
+		HEAD:refs/heads/next \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive: atomic push_options
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive< issue=123
+	remote: proc-receive< reviewer=user1
+	remote: proc-receive> ok refs/for/master/topic
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	To <URL/of/upstream.git>
+	 * [new branch] HEAD -> next
+	 * [new reference] HEAD -> refs/for/master/topic
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	<COMMIT-A> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)             next(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+'
diff --git a/t/t5411/test-0027-push-options--porcelain.sh b/t/t5411/test-0027-push-options--porcelain.sh
new file mode 100644
index 0000000..c89a1e7
--- /dev/null
+++ b/t/t5411/test-0027-push-options--porcelain.sh
@@ -0,0 +1,82 @@
+test_expect_success "setup proc-receive hook and disable push-options ($PROTOCOL/porcelain)" '
+	git -C "$upstream" config receive.advertisePushOptions false &&
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push -o ...  :                       refs/for/master/topic
+test_expect_success "proc-receive: not support push options ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push \
+		--porcelain \
+		-o issue=123 \
+		-o reviewer=user1 \
+		origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	test_i18ngrep "fatal: the receiving end does not support push options" \
+		actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "enable push options ($PROTOCOL/porcelain)" '
+	git -C "$upstream" config receive.advertisePushOptions true
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push -o ...  :                       next(A)  refs/for/master/topic
+test_expect_success "proc-receive: push with options ($PROTOCOL/porcelain)" '
+	git -C workbench push \
+		--porcelain \
+		--atomic \
+		-o issue=123 \
+		-o reviewer=user1 \
+		origin \
+		HEAD:refs/heads/next \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive: atomic push_options
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive< issue=123
+	remote: proc-receive< reviewer=user1
+	remote: proc-receive> ok refs/for/master/topic
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	To <URL/of/upstream.git>
+	*    HEAD:refs/heads/next    [new branch]
+	*    HEAD:refs/for/master/topic    [new reference]
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	<COMMIT-A> refs/heads/next
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)             next(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	git -C "$upstream" update-ref -d refs/heads/next
+'
diff --git a/t/t5411/test-0030-report-ok.sh b/t/t5411/test-0030-report-ok.sh
new file mode 100644
index 0000000..44c99d3
--- /dev/null
+++ b/t/t5411/test-0030-report-ok.sh
@@ -0,0 +1,35 @@
+test_expect_success "setup proc-receive hook (ok, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic
+test_expect_success "proc-receive: ok ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	To <URL/of/upstream.git>
+	 * [new reference] HEAD -> refs/for/master/topic
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0031-report-ok--porcelain.sh b/t/t5411/test-0031-report-ok--porcelain.sh
new file mode 100644
index 0000000..3223b26
--- /dev/null
+++ b/t/t5411/test-0031-report-ok--porcelain.sh
@@ -0,0 +1,36 @@
+test_expect_success "setup proc-receive hook (ok, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic
+test_expect_success "proc-receive: ok ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	To <URL/of/upstream.git>
+	*    HEAD:refs/for/master/topic    [new reference]
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0032-report-with-options.sh b/t/t5411/test-0032-report-with-options.sh
new file mode 100644
index 0000000..b77b78c
--- /dev/null
+++ b/t/t5411/test-0032-report-with-options.sh
@@ -0,0 +1,256 @@
+test_expect_success "setup proc-receive hook (option without matching ok, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option without matching ok ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: error: proc-receive reported "option" without a matching "ok/ng" directive
+	To <URL/of/upstream.git>
+	 ! [remote rejected] HEAD -> refs/for/master/topic (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/pull/123/head"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option refname ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head
+	To <URL/of/upstream.git>
+	 * [new reference] HEAD -> refs/pull/123/head
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname and forced-update, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option forced-update"
+	EOF
+'
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option refname and forced-update ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> option forced-update
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head
+	To <URL/of/upstream.git>
+	 * [new reference] HEAD -> refs/pull/123/head
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname and old-oid, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option refname and old-oid ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/123/head
+	To <URL/of/upstream.git>
+	 <OID-B>..<OID-A> HEAD -> refs/pull/123/head
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option old-oid, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option old-oid ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/for/master/topic
+	To <URL/of/upstream.git>
+	 <OID-B>..<OID-A> HEAD -> refs/for/master/topic
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option old-oid and new-oid, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option old-oid and new-oid ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/master/topic
+	To <URL/of/upstream.git>
+	 <OID-A>..<OID-B> HEAD -> refs/for/master/topic
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (report with multiple rewrites, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/a/b/c/topic" \
+		-r "ok refs/for/next/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/pull/124/head" \
+		-r "option old-oid $B" \
+		-r "option forced-update" \
+		-r "option new-oid $A"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report with multiple rewrites ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/next/topic \
+		HEAD:refs/for/a/b/c/topic \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/a/b/c/topic
+	remote: proc-receive> ok refs/for/next/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/124/head
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: proc-receive> option forced-update
+	remote: proc-receive> option new-oid <COMMIT-A>
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/124/head
+	To <URL/of/upstream.git>
+	 * [new reference] HEAD -> refs/pull/123/head
+	 * [new reference] HEAD -> refs/for/a/b/c/topic
+	 + <OID-B>...<OID-A> HEAD -> refs/pull/124/head (forced update)
+	EOF
+	test_cmp expect actual &&
+
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0033-report-with-options--porcelain.sh b/t/t5411/test-0033-report-with-options--porcelain.sh
new file mode 100644
index 0000000..1fe352b
--- /dev/null
+++ b/t/t5411/test-0033-report-with-options--porcelain.sh
@@ -0,0 +1,265 @@
+test_expect_success "setup proc-receive hook (option without matching ok, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option without matching ok ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: error: proc-receive reported "option" without a matching "ok/ng" directive
+	To <URL/of/upstream.git>
+	!    HEAD:refs/for/master/topic    [remote rejected] (proc-receive failed to report status)
+	Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/pull/123/head"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option refname ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head
+	To <URL/of/upstream.git>
+	*    HEAD:refs/pull/123/head    [new reference]
+	Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname and forced-update, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option forced-update"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option refname and forced-update ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> option forced-update
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head
+	To <URL/of/upstream.git>
+	*    HEAD:refs/pull/123/head    [new reference]
+	Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option refname and old-oid, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option refname and old-oid ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/123/head
+	To <URL/of/upstream.git>
+	     HEAD:refs/pull/123/head    <OID-B>..<OID-A>
+	Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option old-oid, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option old-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option old-oid ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/for/master/topic
+	To <URL/of/upstream.git>
+	     HEAD:refs/for/master/topic    <OID-B>..<OID-A>
+	Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (option old-oid and new-oid, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report option old-oid and new-oid ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/master/topic
+	To <URL/of/upstream.git>
+	     HEAD:refs/for/master/topic    <OID-A>..<OID-B>
+	Done
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (report with multiple rewrites, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/a/b/c/topic" \
+		-r "ok refs/for/next/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/pull/124/head" \
+		-r "option old-oid $B" \
+		-r "option forced-update" \
+		-r "option new-oid $A"
+
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/next/topic(A)  refs/for/a/b/c/topic(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report with multiple rewrites ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/next/topic \
+		HEAD:refs/for/a/b/c/topic \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/a/b/c/topic
+	remote: proc-receive> ok refs/for/next/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/124/head
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: proc-receive> option forced-update
+	remote: proc-receive> option new-oid <COMMIT-A>
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/123/head
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/a/b/c/topic
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/124/head
+	To <URL/of/upstream.git>
+	*    HEAD:refs/pull/123/head    [new reference]
+	*    HEAD:refs/for/a/b/c/topic    [new reference]
+	+    HEAD:refs/pull/124/head    <OID-B>...<OID-A> (forced update)
+	Done
+	EOF
+	test_cmp expect actual &&
+
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0034-report-ft.sh b/t/t5411/test-0034-report-ft.sh
new file mode 100644
index 0000000..aca2b06
--- /dev/null
+++ b/t/t5411/test-0034-report-ft.sh
@@ -0,0 +1,44 @@
+test_expect_success "setup proc-receive hook (ft, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option fall-through"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(B)
+test_expect_success "proc-receive: fall throught, let receive-pack to execute ($PROTOCOL)" '
+	git -C workbench push origin \
+		$B:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-B> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-B> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option fall-through
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-B> refs/for/master/topic
+	To <URL/of/upstream.git>
+	 * [new reference] <COMMIT-B> -> refs/for/master/topic
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/for/master/topic
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)             refs/for/master/topic(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	git -C "$upstream" update-ref -d refs/for/master/topic
+'
diff --git a/t/t5411/test-0035-report-ft--porcelain.sh b/t/t5411/test-0035-report-ft--porcelain.sh
new file mode 100644
index 0000000..30ffffb
--- /dev/null
+++ b/t/t5411/test-0035-report-ft--porcelain.sh
@@ -0,0 +1,45 @@
+test_expect_success "setup proc-receive hook (fall-through, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option fall-through"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(B)
+test_expect_success "proc-receive: fall throught, let receive-pack to execute ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		$B:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-B> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-B> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option fall-through
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-B> refs/for/master/topic
+	To <URL/of/upstream.git>
+	*    <COMMIT-B>:refs/for/master/topic    [new reference]
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/for/master/topic
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)             refs/for/master/topic(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	git -C "$upstream" update-ref -d refs/for/master/topic
+'
diff --git a/t/t5411/test-0036-report-multi-rewrite-for-one-ref.sh b/t/t5411/test-0036-report-multi-rewrite-for-one-ref.sh
new file mode 100644
index 0000000..73283d8
--- /dev/null
+++ b/t/t5411/test-0036-report-multi-rewrite-for-one-ref.sh
@@ -0,0 +1,227 @@
+test_expect_success "setup git config for remote-tracking of special refs" '
+	(
+		cd workbench &&
+		if ! git config --get-all remote.origin.fetch | grep refs/for/
+		then
+			git config --add remote.origin.fetch \
+				"+refs/for/*:refs/t/for/*" &&
+			git config --add remote.origin.fetch \
+				"+refs/pull/*:refs/t/pull/*" &&
+			git config --add remote.origin.fetch \
+				"+refs/changes/*:refs/t/changes/*"
+		fi
+	)
+'
+
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, no refname for the 1st rewrite, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/24/124/1" \
+		-r "option old-oid $ZERO_OID" \
+		-r "option new-oid $A" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/25/125/1" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(A)
+test_expect_success "proc-receive: multiple rewrite for one ref, no refname for the 1st rewrite ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/24/124/1
+	remote: proc-receive> option old-oid <ZERO-OID>
+	remote: proc-receive> option new-oid <COMMIT-A>
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/25/125/1
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/master/topic
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/24/124/1
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/changes/25/125/1
+	To <URL/of/upstream.git>
+	 <OID-A>..<OID-B> HEAD -> refs/for/master/topic
+	 * [new reference] HEAD -> refs/changes/24/124/1
+	 <OID-A>..<OID-B> HEAD -> refs/changes/25/125/1
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "proc-receive: check remote-tracking #1 ($PROTOCOL)" '
+	git -C workbench show-ref |
+		grep -v -e refs/remotes -e refs/heads -e refs/tags >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/t/changes/24/124/1
+	<COMMIT-B> refs/t/changes/25/125/1
+	<COMMIT-B> refs/t/for/master/topic
+	EOF
+	test_cmp expect actual &&
+	git -C workbench update-ref -d refs/t/for/master/topic &&
+	git -C workbench update-ref -d refs/t/changes/24/124/1 &&
+	git -C workbench update-ref -d refs/t/changes/25/125/1
+'
+
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, no refname for the 2nd rewrite, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/24/124/1" \
+		-r "option old-oid $ZERO_OID" \
+		-r "option new-oid $A" \
+		-r "ok refs/for/master/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/25/125/1" \
+		-r "option old-oid $B" \
+		-r "option new-oid $A" \
+		-r "option forced-update"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(A)
+test_expect_success "proc-receive: multiple rewrites for one ref, no refname for the 2nd rewrite ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/24/124/1
+	remote: proc-receive> option old-oid <ZERO-OID>
+	remote: proc-receive> option new-oid <COMMIT-A>
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/25/125/1
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: proc-receive> option new-oid <COMMIT-A>
+	remote: proc-receive> option forced-update
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/24/124/1
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/master/topic
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/changes/25/125/1
+	To <URL/of/upstream.git>
+	 * [new reference] HEAD -> refs/changes/24/124/1
+	 <OID-A>..<OID-B> HEAD -> refs/for/master/topic
+	 + <OID-B>...<OID-A> HEAD -> refs/changes/25/125/1 (forced update)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "proc-receive: check remote-tracking #2 ($PROTOCOL)" '
+	git -C workbench show-ref |
+		grep -v -e refs/remotes -e refs/heads -e refs/tags >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/t/changes/24/124/1
+	<COMMIT-A> refs/t/changes/25/125/1
+	<COMMIT-B> refs/t/for/master/topic
+	EOF
+	test_cmp expect actual &&
+	git -C workbench update-ref -d refs/t/for/master/topic &&
+	git -C workbench update-ref -d refs/t/changes/24/124/1 &&
+	git -C workbench update-ref -d refs/t/changes/25/125/1
+'
+
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, $PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/23/123/1" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/24/124/2" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(A)
+test_expect_success "proc-receive: multiple rewrites for one ref ($PROTOCOL)" '
+	git -C workbench push origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/23/123/1
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/24/124/2
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/23/123/1
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/changes/24/124/2
+	To <URL/of/upstream.git>
+	 * [new reference] HEAD -> refs/changes/23/123/1
+	 <OID-A>..<OID-B> HEAD -> refs/changes/24/124/2
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "proc-receive: check remote-tracking #3 ($PROTOCOL)" '
+	git -C workbench show-ref |
+		grep -v -e refs/remotes -e refs/heads -e refs/tags >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/t/changes/23/123/1
+	<COMMIT-B> refs/t/changes/24/124/2
+	EOF
+	test_cmp expect actual &&
+	git -C workbench update-ref -d refs/t/changes/24/124/1 &&
+	git -C workbench update-ref -d refs/t/changes/25/125/2
+'
diff --git a/t/t5411/test-0037-report-multi-rewrite-for-one-ref--porcelain.sh b/t/t5411/test-0037-report-multi-rewrite-for-one-ref--porcelain.sh
new file mode 100644
index 0000000..77b5b22
--- /dev/null
+++ b/t/t5411/test-0037-report-multi-rewrite-for-one-ref--porcelain.sh
@@ -0,0 +1,172 @@
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, no refname for the 1st rewrite, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/24/124/1" \
+		-r "option old-oid $ZERO_OID" \
+		-r "option new-oid $A" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/25/125/1" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(A)
+test_expect_success "proc-receive: multiple rewrite for one ref, no refname for the 1st rewrite ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/24/124/1
+	remote: proc-receive> option old-oid <ZERO-OID>
+	remote: proc-receive> option new-oid <COMMIT-A>
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/25/125/1
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/master/topic
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/24/124/1
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/changes/25/125/1
+	To <URL/of/upstream.git>
+	     HEAD:refs/for/master/topic    <OID-A>..<OID-B>
+	*    HEAD:refs/changes/24/124/1    [new reference]
+	     HEAD:refs/changes/25/125/1    <OID-A>..<OID-B>
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, no refname for the 2nd rewrite, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/24/124/1" \
+		-r "option old-oid $ZERO_OID" \
+		-r "option new-oid $A" \
+		-r "ok refs/for/master/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/25/125/1" \
+		-r "option old-oid $B" \
+		-r "option new-oid $A" \
+		-r "option forced-update"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(A)
+test_expect_success "proc-receive: multiple rewrites for one ref, no refname for the 2nd rewrite ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/24/124/1
+	remote: proc-receive> option old-oid <ZERO-OID>
+	remote: proc-receive> option new-oid <COMMIT-A>
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/25/125/1
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: proc-receive> option new-oid <COMMIT-A>
+	remote: proc-receive> option forced-update
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/24/124/1
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/master/topic
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/changes/25/125/1
+	To <URL/of/upstream.git>
+	*    HEAD:refs/changes/24/124/1    [new reference]
+	     HEAD:refs/for/master/topic    <OID-A>..<OID-B>
+	+    HEAD:refs/changes/25/125/1    <OID-B>...<OID-A> (forced update)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook (multiple rewrites for one ref, $PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/23/123/1" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/changes/24/124/2" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         :                       refs/for/master/topic(A)
+test_expect_success "proc-receive: multiple rewrites for one ref ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain origin \
+		HEAD:refs/for/master/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/23/123/1
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/changes/24/124/2
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/changes/23/123/1
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/changes/24/124/2
+	To <URL/of/upstream.git>
+	*    HEAD:refs/changes/23/123/1    [new reference]
+	     HEAD:refs/changes/24/124/2    <OID-A>..<OID-B>
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5411/test-0038-report-mixed-refs.sh b/t/t5411/test-0038-report-mixed-refs.sh
new file mode 100644
index 0000000..a74a2cb
--- /dev/null
+++ b/t/t5411/test-0038-report-mixed-refs.sh
@@ -0,0 +1,89 @@
+test_expect_success "setup proc-receive hook ($PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/next/topic2" \
+		-r "ng refs/for/next/topic1 fail to call Web API" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/for/master/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         : (B)                   bar(A)  baz(A)  refs/for/next/topic(A)  foo(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report update of mixed refs ($PROTOCOL)" '
+	test_must_fail git -C workbench push origin \
+		$B:refs/heads/master \
+		HEAD:refs/heads/bar \
+		HEAD:refs/heads/baz \
+		HEAD:refs/for/next/topic2 \
+		HEAD:refs/for/next/topic1 \
+		HEAD:refs/heads/foo \
+		HEAD:refs/for/master/topic \
+		HEAD:refs/for/next/topic3 \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/bar
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/baz
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic1
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic3
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic1
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic3
+	remote: proc-receive> ok refs/for/next/topic2
+	remote: proc-receive> ng refs/for/next/topic1 fail to call Web API
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/for/master/topic
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/bar
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/baz
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/master/topic
+	To <URL/of/upstream.git>
+	 <OID-A>..<OID-B> <COMMIT-B> -> master
+	 * [new branch] HEAD -> bar
+	 * [new branch] HEAD -> baz
+	 * [new reference] HEAD -> refs/for/next/topic2
+	 * [new branch] HEAD -> foo
+	 <OID-A>..<OID-B> HEAD -> refs/for/master/topic
+	 ! [remote rejected] HEAD -> refs/for/next/topic1 (fail to call Web API)
+	 ! [remote rejected] HEAD -> refs/for/next/topic3 (proc-receive failed to report status)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/bar
+	<COMMIT-A> refs/heads/baz
+	<COMMIT-A> refs/heads/foo
+	<COMMIT-B> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(B)             foo(A)  bar(A))  baz(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	(
+		cd "$upstream" &&
+		git update-ref refs/heads/master $A &&
+		git update-ref -d refs/heads/foo &&
+		git update-ref -d refs/heads/bar &&
+		git update-ref -d refs/heads/baz
+	)
+'
diff --git a/t/t5411/test-0039-report-mixed-refs--porcelain.sh b/t/t5411/test-0039-report-mixed-refs--porcelain.sh
new file mode 100644
index 0000000..e4baa13
--- /dev/null
+++ b/t/t5411/test-0039-report-mixed-refs--porcelain.sh
@@ -0,0 +1,91 @@
+test_expect_success "setup proc-receive hook ($PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/for/next/topic2" \
+		-r "ng refs/for/next/topic1 fail to call Web API" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/for/master/topic" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         : (B)                   bar(A)  baz(A)  refs/for/next/topic(A)  foo(A)  refs/for/master/topic(A)
+test_expect_success "proc-receive: report update of mixed refs ($PROTOCOL/porcelain)" '
+	test_must_fail git -C workbench push --porcelain origin \
+		$B:refs/heads/master \
+		HEAD:refs/heads/bar \
+		HEAD:refs/heads/baz \
+		HEAD:refs/for/next/topic2 \
+		HEAD:refs/for/next/topic1 \
+		HEAD:refs/heads/foo \
+		HEAD:refs/for/master/topic \
+		HEAD:refs/for/next/topic3 \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/bar
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/baz
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic1
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic3
+	remote: # proc-receive hook
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic1
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic3
+	remote: proc-receive> ok refs/for/next/topic2
+	remote: proc-receive> ng refs/for/next/topic1 fail to call Web API
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/for/master/topic
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/bar
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/baz
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic2
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/heads/foo
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/for/master/topic
+	To <URL/of/upstream.git>
+	     <COMMIT-B>:refs/heads/master    <OID-A>..<OID-B>
+	*    HEAD:refs/heads/bar    [new branch]
+	*    HEAD:refs/heads/baz    [new branch]
+	*    HEAD:refs/for/next/topic2    [new reference]
+	*    HEAD:refs/heads/foo    [new branch]
+	     HEAD:refs/for/master/topic    <OID-A>..<OID-B>
+	!    HEAD:refs/for/next/topic1    [remote rejected] (fail to call Web API)
+	!    HEAD:refs/for/next/topic3    [remote rejected] (proc-receive failed to report status)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/bar
+	<COMMIT-A> refs/heads/baz
+	<COMMIT-A> refs/heads/foo
+	<COMMIT-B> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(B)             foo(A)  bar(A))  baz(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	(
+		cd "$upstream" &&
+		git update-ref refs/heads/master $A &&
+		git update-ref -d refs/heads/foo &&
+		git update-ref -d refs/heads/bar &&
+		git update-ref -d refs/heads/baz
+	)
+
+'
diff --git a/t/t5411/test-0040-process-all-refs.sh b/t/t5411/test-0040-process-all-refs.sh
new file mode 100644
index 0000000..b07c999
--- /dev/null
+++ b/t/t5411/test-0040-process-all-refs.sh
@@ -0,0 +1,113 @@
+test_expect_success "config receive.procReceiveRefs = refs ($PROTOCOL)" '
+	git -C "$upstream" config --unset-all receive.procReceiveRefs &&
+	git -C "$upstream" config --add receive.procReceiveRefs refs
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "setup upstream branches ($PROTOCOL)" '
+	(
+		cd "$upstream" &&
+		git update-ref refs/heads/master $B &&
+		git update-ref refs/heads/foo $A &&
+		git update-ref refs/heads/bar $A &&
+		git update-ref refs/heads/baz $A
+	)
+
+'
+
+test_expect_success "setup proc-receive hook ($PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/master" \
+		-r "option fall-through" \
+		-r "ok refs/heads/foo" \
+		-r "option fall-through" \
+		-r "ok refs/heads/bar" \
+		-r "option fall-through" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/next/topic" \
+		-r "option refname refs/pull/124/head" \
+		-r "option old-oid $B" \
+		-r "option new-oid $A" \
+		-r "option forced-update"
+	EOF
+'
+
+# Refs of upstream : master(B)             foo(A)  bar(A))  baz(A)
+# Refs of workbench: master(A)  tags/v123
+# git push -f      : master(A)             (NULL)  (B)              refs/for/master/topic(A)  refs/for/next/topic(A)
+test_expect_success "proc-receive: process all refs ($PROTOCOL)" '
+	git -C workbench push -f origin \
+		HEAD:refs/heads/master \
+		:refs/heads/foo \
+		$B:refs/heads/bar \
+		HEAD:refs/for/master/topic \
+		HEAD:refs/for/next/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar
+	remote: pre-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo
+	remote: pre-receive< <COMMIT-B> <COMMIT-A> refs/heads/master
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar
+	remote: proc-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo
+	remote: proc-receive< <COMMIT-B> <COMMIT-A> refs/heads/master
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	remote: proc-receive> ok refs/heads/master
+	remote: proc-receive> option fall-through
+	remote: proc-receive> ok refs/heads/foo
+	remote: proc-receive> option fall-through
+	remote: proc-receive> ok refs/heads/bar
+	remote: proc-receive> option fall-through
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: proc-receive> ok refs/for/next/topic
+	remote: proc-receive> option refname refs/pull/124/head
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: proc-receive> option new-oid <COMMIT-A>
+	remote: proc-receive> option forced-update
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar
+	remote: post-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/heads/master
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/pull/123/head
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/124/head
+	To <URL/of/upstream.git>
+	 <OID-A>..<OID-B> <COMMIT-B> -> bar
+	 - [deleted] foo
+	 + <OID-B>...<OID-A> HEAD -> master (forced update)
+	 <OID-A>..<OID-B> HEAD -> refs/pull/123/head
+	 + <OID-B>...<OID-A> HEAD -> refs/pull/124/head (forced update)
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/heads/bar
+	<COMMIT-A> refs/heads/baz
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)             bar(A)  baz(B)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL)" '
+	(
+		cd "$upstream" &&
+		git update-ref -d refs/heads/bar &&
+		git update-ref -d refs/heads/baz
+	)
+'
diff --git a/t/t5411/test-0041-process-all-refs--porcelain.sh b/t/t5411/test-0041-process-all-refs--porcelain.sh
new file mode 100644
index 0000000..0dd9824
--- /dev/null
+++ b/t/t5411/test-0041-process-all-refs--porcelain.sh
@@ -0,0 +1,114 @@
+test_expect_success "config receive.procReceiveRefs = refs ($PROTOCOL/porcelain)" '
+	git -C "$upstream" config --unset-all receive.procReceiveRefs &&
+	git -C "$upstream" config --add receive.procReceiveRefs refs
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "setup upstream branches ($PROTOCOL/porcelain)" '
+	(
+		cd "$upstream" &&
+		git update-ref refs/heads/master $B &&
+		git update-ref refs/heads/foo $A &&
+		git update-ref refs/heads/bar $A &&
+		git update-ref refs/heads/baz $A
+	)
+
+'
+
+test_expect_success "setup proc-receive hook ($PROTOCOL/porcelain)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/master" \
+		-r "option fall-through" \
+		-r "ok refs/heads/foo" \
+		-r "option fall-through" \
+		-r "ok refs/heads/bar" \
+		-r "option fall-through" \
+		-r "ok refs/for/master/topic" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/for/next/topic" \
+		-r "option refname refs/pull/124/head" \
+		-r "option old-oid $B" \
+		-r "option new-oid $A" \
+		-r "option forced-update"
+	EOF
+'
+
+# Refs of upstream : master(B)             foo(A)  bar(A))  baz(A)
+# Refs of workbench: master(A)  tags/v123
+# git push -f      : master(A)             (NULL)  (B)              refs/for/master/topic(A)  refs/for/next/topic(A)
+test_expect_success "proc-receive: process all refs ($PROTOCOL/porcelain)" '
+	git -C workbench push --porcelain -f origin \
+		HEAD:refs/heads/master \
+		:refs/heads/foo \
+		$B:refs/heads/bar \
+		HEAD:refs/for/master/topic \
+		HEAD:refs/for/next/topic \
+		>out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar
+	remote: pre-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo
+	remote: pre-receive< <COMMIT-B> <COMMIT-A> refs/heads/master
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	remote: # proc-receive hook
+	remote: proc-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar
+	remote: proc-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo
+	remote: proc-receive< <COMMIT-B> <COMMIT-A> refs/heads/master
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/master/topic
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/for/next/topic
+	remote: proc-receive> ok refs/heads/master
+	remote: proc-receive> option fall-through
+	remote: proc-receive> ok refs/heads/foo
+	remote: proc-receive> option fall-through
+	remote: proc-receive> ok refs/heads/bar
+	remote: proc-receive> option fall-through
+	remote: proc-receive> ok refs/for/master/topic
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: proc-receive> ok refs/for/next/topic
+	remote: proc-receive> option refname refs/pull/124/head
+	remote: proc-receive> option old-oid <COMMIT-B>
+	remote: proc-receive> option new-oid <COMMIT-A>
+	remote: proc-receive> option forced-update
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/bar
+	remote: post-receive< <COMMIT-A> <ZERO-OID> refs/heads/foo
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/heads/master
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/pull/123/head
+	remote: post-receive< <COMMIT-B> <COMMIT-A> refs/pull/124/head
+	To <URL/of/upstream.git>
+	     <COMMIT-B>:refs/heads/bar    <OID-A>..<OID-B>
+	-    :refs/heads/foo    [deleted]
+	+    HEAD:refs/heads/master    <OID-B>...<OID-A> (forced update)
+	     HEAD:refs/pull/123/head    <OID-A>..<OID-B>
+	+    HEAD:refs/pull/124/head    <OID-B>...<OID-A> (forced update)
+	Done
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-B> refs/heads/bar
+	<COMMIT-A> refs/heads/baz
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)             bar(A)  baz(B)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "cleanup ($PROTOCOL/porcelain)" '
+	(
+		cd "$upstream" &&
+		git update-ref -d refs/heads/bar &&
+		git update-ref -d refs/heads/baz
+	)
+'
diff --git a/t/t5411/test-0050-proc-receive-refs-with-modifiers.sh b/t/t5411/test-0050-proc-receive-refs-with-modifiers.sh
new file mode 100644
index 0000000..c22849c
--- /dev/null
+++ b/t/t5411/test-0050-proc-receive-refs-with-modifiers.sh
@@ -0,0 +1,135 @@
+test_expect_success "config receive.procReceiveRefs with modifiers ($PROTOCOL)" '
+	(
+		cd "$upstream" &&
+		git config --unset-all receive.procReceiveRefs &&
+		git config --add receive.procReceiveRefs m:refs/heads/master &&
+		git config --add receive.procReceiveRefs ad:refs/heads &&
+		git config --add receive.procReceiveRefs "a!:refs/heads"
+	)
+'
+
+test_expect_success "setup proc-receive hook ($PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/master" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $A" \
+		-r "option new-oid $B" \
+		-r "ok refs/tags/v123 " \
+		-r "option refname refs/pull/124/head"
+	EOF
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+# git push         : master(B)  tags/v123
+test_expect_success "proc-receive: update branch and new tag ($PROTOCOL)" '
+	git -C workbench push origin \
+		$B:refs/heads/master \
+		v123 >out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: pre-receive< <ZERO-OID> <TAG-v123> refs/tags/v123
+	remote: # proc-receive hook
+	remote: proc-receive< <COMMIT-A> <COMMIT-B> refs/heads/master
+	remote: proc-receive< <ZERO-OID> <TAG-v123> refs/tags/v123
+	remote: proc-receive> ok refs/heads/master
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <COMMIT-B>
+	remote: proc-receive> ok refs/tags/v123
+	remote: proc-receive> option refname refs/pull/124/head
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/pull/123/head
+	remote: post-receive< <ZERO-OID> <TAG-v123> refs/pull/124/head
+	To <URL/of/upstream.git>
+	 <OID-A>..<OID-B> <COMMIT-B> -> refs/pull/123/head
+	 * [new reference] v123 -> refs/pull/124/head
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	EOF
+	test_cmp expect actual
+'
+
+# Refs of upstream : master(A)
+# Refs of workbench: master(A)  tags/v123
+test_expect_success "setup upstream: create tags/v123 ($PROTOCOL)" '
+	git -C "$upstream" update-ref refs/heads/topic $A &&
+	git -C "$upstream" update-ref refs/tags/v123 $TAG &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	<COMMIT-A> refs/heads/topic
+	<TAG-v123> refs/tags/v123
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success "setup proc-receive hook ($PROTOCOL)" '
+	write_script "$upstream/hooks/proc-receive" <<-EOF
+	printf >&2 "# proc-receive hook\n"
+	test-tool proc-receive -v \
+		-r "ok refs/heads/master" \
+		-r "option refname refs/pull/123/head" \
+		-r "option old-oid $A" \
+		-r "option new-oid $ZERO_OID" \
+		-r "ok refs/heads/next" \
+		-r "option refname refs/pull/124/head" \
+		-r "option new-oid $A"
+	EOF
+'
+
+# Refs of upstream : master(A)  topic(A)  tags/v123
+# Refs of workbench: master(A)            tags/v123
+# git push         : NULL       topic(B)  NULL       next(A)
+test_expect_success "proc-receive: create/delete branch, and delete tag ($PROTOCOL)" '
+	git -C workbench push origin \
+		:refs/heads/master \
+		$B:refs/heads/topic \
+		$A:refs/heads/next \
+		:refs/tags/v123 >out 2>&1 &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	remote: # pre-receive hook
+	remote: pre-receive< <COMMIT-A> <ZERO-OID> refs/heads/master
+	remote: pre-receive< <COMMIT-A> <COMMIT-B> refs/heads/topic
+	remote: pre-receive< <TAG-v123> <ZERO-OID> refs/tags/v123
+	remote: pre-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: # proc-receive hook
+	remote: proc-receive< <COMMIT-A> <ZERO-OID> refs/heads/master
+	remote: proc-receive< <ZERO-OID> <COMMIT-A> refs/heads/next
+	remote: proc-receive> ok refs/heads/master
+	remote: proc-receive> option refname refs/pull/123/head
+	remote: proc-receive> option old-oid <COMMIT-A>
+	remote: proc-receive> option new-oid <ZERO-OID>
+	remote: proc-receive> ok refs/heads/next
+	remote: proc-receive> option refname refs/pull/124/head
+	remote: proc-receive> option new-oid <COMMIT-A>
+	remote: # post-receive hook
+	remote: post-receive< <COMMIT-A> <ZERO-OID> refs/pull/123/head
+	remote: post-receive< <COMMIT-A> <COMMIT-B> refs/heads/topic
+	remote: post-receive< <TAG-v123> <ZERO-OID> refs/tags/v123
+	remote: post-receive< <ZERO-OID> <COMMIT-A> refs/pull/124/head
+	To <URL/of/upstream.git>
+	 - [deleted] refs/pull/123/head
+	 <OID-A>..<OID-B> <COMMIT-B> -> topic
+	 - [deleted] v123
+	 * [new reference] <COMMIT-A> -> refs/pull/124/head
+	EOF
+	test_cmp expect actual &&
+	git -C "$upstream" show-ref >out &&
+	make_user_friendly_and_stable_output <out >actual &&
+	cat >expect <<-EOF &&
+	<COMMIT-A> refs/heads/master
+	<COMMIT-B> refs/heads/topic
+	EOF
+	test_cmp expect actual
+'
diff --git a/t/t5510-fetch.sh b/t/t5510-fetch.sh
index 759aec9..dbc724e 100755
--- a/t/t5510-fetch.sh
+++ b/t/t5510-fetch.sh
@@ -936,7 +936,7 @@
 		git config fetch.unpackLimit 1 &&
 		git config gc.autoPackLimit 1 &&
 		git config gc.autoDetach false &&
-		GIT_ASK_YESNO="$D/askyesno" git fetch >fetch.out 2>&1 &&
+		GIT_ASK_YESNO="$D/askyesno" git fetch --verbose >fetch.out 2>&1 &&
 		test_i18ngrep "Auto packing the repository" fetch.out &&
 		! grep "Should I try again" fetch.out
 	)
diff --git a/t/t5514-fetch-multiple.sh b/t/t5514-fetch-multiple.sh
index de8e2f1..bd202ec 100755
--- a/t/t5514-fetch-multiple.sh
+++ b/t/t5514-fetch-multiple.sh
@@ -108,7 +108,7 @@
 	 GIT_TRACE=1 git fetch --multiple one two 2>trace &&
 	 git branch -r > output &&
 	 test_cmp ../expect output &&
-	 grep "built-in: git gc" trace >gc &&
+	 grep "built-in: git maintenance" trace >gc &&
 	 test_line_count = 1 gc
 	)
 '
diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh
index 36ad20a..d11382f 100755
--- a/t/t5516-fetch-push.sh
+++ b/t/t5516-fetch-push.sh
@@ -1039,7 +1039,7 @@
 test_expect_success 'push --porcelain' '
 	mk_empty testrepo &&
 	echo >.git/foo  "To testrepo" &&
-	echo >>.git/foo "*	refs/heads/master:refs/remotes/origin/master	[new branch]"  &&
+	echo >>.git/foo "*	refs/heads/master:refs/remotes/origin/master	[new reference]"  &&
 	echo >>.git/foo "Done" &&
 	git push >.git/bar --porcelain  testrepo refs/heads/master:refs/remotes/origin/master &&
 	(
diff --git a/t/t5534-push-signed.sh b/t/t5534-push-signed.sh
index 030331f..7e928af 100755
--- a/t/t5534-push-signed.sh
+++ b/t/t5534-push-signed.sh
@@ -273,4 +273,27 @@
 	test_cmp expect dst/push-cert-status
 '
 
+test_expect_success GPG 'failed atomic push does not execute GPG' '
+	prepare_dst &&
+	git -C dst config receive.certnonceseed sekrit &&
+	write_script gpg <<-EOF &&
+	# should check atomic push locally before running GPG.
+	exit 1
+	EOF
+	test_must_fail env PATH="$TRASH_DIRECTORY:$PATH" git push \
+			--signed --atomic --porcelain \
+			dst noop ff noff >out 2>&1 &&
+
+	test_i18ngrep ! "gpg failed to sign" out &&
+	sed -n -e "/^To dst/,$ p" out >actual &&
+	cat >expect <<-EOF &&
+	To dst
+	=	refs/heads/noop:refs/heads/noop	[up to date]
+	!	refs/heads/ff:refs/heads/ff	[rejected] (atomic push failed)
+	!	refs/heads/noff:refs/heads/noff	[rejected] (non-fast-forward)
+	Done
+	EOF
+	test_i18ncmp expect actual
+'
+
 test_done
diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index 15fb64c..b6c8312 100755
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -631,6 +631,20 @@
 	test_i18ngrep "the following paths have collided" icasefs/warning
 '
 
+test_expect_success 'clone with GIT_DEFAULT_HASH' '
+	(
+		sane_unset GIT_DEFAULT_HASH &&
+		git init --object-format=sha1 test-sha1 &&
+		git init --object-format=sha256 test-sha256
+	) &&
+	test_commit -C test-sha1 foo &&
+	test_commit -C test-sha256 foo &&
+	GIT_DEFAULT_HASH=sha1 git clone test-sha256 test-clone-sha256 &&
+	GIT_DEFAULT_HASH=sha256 git clone test-sha1 test-clone-sha1 &&
+	git -C test-clone-sha1 status &&
+	git -C test-clone-sha256 status
+'
+
 partial_clone_server () {
 	       SERVER="$1" &&
 
diff --git a/t/t6030-bisect-porcelain.sh b/t/t6030-bisect-porcelain.sh
index b886529..aa22638 100755
--- a/t/t6030-bisect-porcelain.sh
+++ b/t/t6030-bisect-porcelain.sh
@@ -82,6 +82,13 @@
 	git bisect bad $HASH4
 '
 
+test_expect_success 'bisect start without -- takes unknown arg as pathspec' '
+	git bisect reset &&
+	git bisect start foo bar &&
+	grep foo ".git/BISECT_NAMES" &&
+	grep bar ".git/BISECT_NAMES"
+'
+
 test_expect_success 'bisect reset: back in the master branch' '
 	git bisect reset &&
 	echo "* master" > branch.expect &&
diff --git a/t/t6302-for-each-ref-filter.sh b/t/t6302-for-each-ref-filter.sh
index 35408d5..781e470 100755
--- a/t/t6302-for-each-ref-filter.sh
+++ b/t/t6302-for-each-ref-filter.sh
@@ -437,8 +437,8 @@
 	test_cmp expect actual
 '
 
-test_expect_success '--merged is incompatible with --no-merged' '
-	test_must_fail git for-each-ref --merged HEAD --no-merged HEAD
+test_expect_success '--merged is compatible with --no-merged' '
+	git for-each-ref --merged HEAD --no-merged HEAD
 '
 
 test_expect_success 'validate worktree atom' '
diff --git a/t/t6600-test-reach.sh b/t/t6600-test-reach.sh
index 475564b..f807276 100755
--- a/t/t6600-test-reach.sh
+++ b/t/t6600-test-reach.sh
@@ -110,6 +110,36 @@
 	test_three_modes in_merge_bases
 '
 
+test_expect_success 'in_merge_bases_many:hit' '
+	cat >input <<-\EOF &&
+	A:commit-6-8
+	X:commit-6-9
+	X:commit-5-7
+	EOF
+	echo "in_merge_bases_many(A,X):1" >expect &&
+	test_three_modes in_merge_bases_many
+'
+
+test_expect_success 'in_merge_bases_many:miss' '
+	cat >input <<-\EOF &&
+	A:commit-6-8
+	X:commit-7-7
+	X:commit-8-6
+	EOF
+	echo "in_merge_bases_many(A,X):0" >expect &&
+	test_three_modes in_merge_bases_many
+'
+
+test_expect_success 'in_merge_bases_many:miss-heuristic' '
+	cat >input <<-\EOF &&
+	A:commit-6-8
+	X:commit-7-5
+	X:commit-6-6
+	EOF
+	echo "in_merge_bases_many(A,X):0" >expect &&
+	test_three_modes in_merge_bases_many
+'
+
 test_expect_success 'is_descendant_of:hit' '
 	cat >input <<-\EOF &&
 	A:commit-5-7
diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index 74b637d..05f411c 100755
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -2015,8 +2015,8 @@
 	test_cmp expect actual
 '
 
-test_expect_success '--merged is incompatible with --no-merged' '
-	test_must_fail git tag --merged HEAD --no-merged HEAD
+test_expect_success '--merged is compatible with --no-merged' '
+	git tag --merged HEAD --no-merged HEAD
 '
 
 test_expect_success '--merged shows merged tags' '
diff --git a/t/t7601-merge-pull-config.sh b/t/t7601-merge-pull-config.sh
index 0f97828..c5c4ea5 100755
--- a/t/t7601-merge-pull-config.sh
+++ b/t/t7601-merge-pull-config.sh
@@ -33,11 +33,18 @@
 	test_i18ngrep "Pulling without specifying how to reconcile" err
 '
 
+test_expect_success 'pull.rebase not set and pull.ff=true' '
+	git reset --hard c0 &&
+	test_config pull.ff true &&
+	git pull . c1 2>err &&
+	test_i18ngrep ! "Pulling without specifying how to reconcile" err
+'
+
 test_expect_success 'pull.rebase not set and pull.ff=false' '
 	git reset --hard c0 &&
 	test_config pull.ff false &&
 	git pull . c1 2>err &&
-	test_i18ngrep "Pulling without specifying how to reconcile" err
+	test_i18ngrep ! "Pulling without specifying how to reconcile" err
 '
 
 test_expect_success 'pull.rebase not set and pull.ff=only' '
@@ -59,6 +66,18 @@
 	test_i18ngrep ! "Pulling without specifying how to reconcile" err
 '
 
+test_expect_success 'pull.rebase not set and --ff given' '
+	git reset --hard c0 &&
+	git pull --ff . c1 2>err &&
+	test_i18ngrep ! "Pulling without specifying how to reconcile" err
+'
+
+test_expect_success 'pull.rebase not set and --no-ff given' '
+	git reset --hard c0 &&
+	git pull --no-ff . c1 2>err &&
+	test_i18ngrep ! "Pulling without specifying how to reconcile" err
+'
+
 test_expect_success 'pull.rebase not set and --ff-only given' '
 	git reset --hard c0 &&
 	git pull --ff-only . c1 2>err &&
diff --git a/t/t7900-maintenance.sh b/t/t7900-maintenance.sh
new file mode 100755
index 0000000..53c8835
--- /dev/null
+++ b/t/t7900-maintenance.sh
@@ -0,0 +1,65 @@
+#!/bin/sh
+
+test_description='git maintenance builtin'
+
+. ./test-lib.sh
+
+GIT_TEST_COMMIT_GRAPH=0
+
+test_expect_success 'help text' '
+	test_expect_code 129 git maintenance -h 2>err &&
+	test_i18ngrep "usage: git maintenance run" err &&
+	test_expect_code 128 git maintenance barf 2>err &&
+	test_i18ngrep "invalid subcommand: barf" err &&
+	test_expect_code 129 git maintenance 2>err &&
+	test_i18ngrep "usage: git maintenance" err
+'
+
+test_expect_success 'run [--auto|--quiet]' '
+	GIT_TRACE2_EVENT="$(pwd)/run-no-auto.txt" \
+		git maintenance run 2>/dev/null &&
+	GIT_TRACE2_EVENT="$(pwd)/run-auto.txt" \
+		git maintenance run --auto 2>/dev/null &&
+	GIT_TRACE2_EVENT="$(pwd)/run-no-quiet.txt" \
+		git maintenance run --no-quiet 2>/dev/null &&
+	test_subcommand git gc --quiet <run-no-auto.txt &&
+	test_subcommand ! git gc --auto --quiet <run-auto.txt &&
+	test_subcommand git gc --no-quiet <run-no-quiet.txt
+'
+
+test_expect_success 'maintenance.<task>.enabled' '
+	git config maintenance.gc.enabled false &&
+	git config maintenance.commit-graph.enabled true &&
+	GIT_TRACE2_EVENT="$(pwd)/run-config.txt" git maintenance run 2>err &&
+	test_subcommand ! git gc --quiet <run-config.txt &&
+	test_subcommand git commit-graph write --split --reachable --no-progress <run-config.txt
+'
+
+test_expect_success 'run --task=<task>' '
+	GIT_TRACE2_EVENT="$(pwd)/run-commit-graph.txt" \
+		git maintenance run --task=commit-graph 2>/dev/null &&
+	GIT_TRACE2_EVENT="$(pwd)/run-gc.txt" \
+		git maintenance run --task=gc 2>/dev/null &&
+	GIT_TRACE2_EVENT="$(pwd)/run-commit-graph.txt" \
+		git maintenance run --task=commit-graph 2>/dev/null &&
+	GIT_TRACE2_EVENT="$(pwd)/run-both.txt" \
+		git maintenance run --task=commit-graph --task=gc 2>/dev/null &&
+	test_subcommand ! git gc --quiet <run-commit-graph.txt &&
+	test_subcommand git gc --quiet <run-gc.txt &&
+	test_subcommand git gc --quiet <run-both.txt &&
+	test_subcommand git commit-graph write --split --reachable --no-progress <run-commit-graph.txt &&
+	test_subcommand ! git commit-graph write --split --reachable --no-progress <run-gc.txt &&
+	test_subcommand git commit-graph write --split --reachable --no-progress <run-both.txt
+'
+
+test_expect_success 'run --task=bogus' '
+	test_must_fail git maintenance run --task=bogus 2>err &&
+	test_i18ngrep "is not a valid task" err
+'
+
+test_expect_success 'run --task duplicate' '
+	test_must_fail git maintenance run --task=gc --task=gc 2>err &&
+	test_i18ngrep "cannot be selected multiple times" err
+'
+
+test_done
diff --git a/t/t8013-blame-ignore-revs.sh b/t/t8013-blame-ignore-revs.sh
index 36dc31e..24ae501 100755
--- a/t/t8013-blame-ignore-revs.sh
+++ b/t/t8013-blame-ignore-revs.sh
@@ -21,6 +21,7 @@
 	test_tick &&
 	git commit -m X &&
 	git tag X &&
+	git tag -a -m "X (annotated)" XT &&
 
 	git blame --line-porcelain file >blame_raw &&
 
@@ -31,20 +32,36 @@
 	grep -E "^[0-9a-f]+ [0-9]+ 2" blame_raw | sed -e "s/ .*//" >actual &&
 	git rev-parse X >expect &&
 	test_cmp expect actual
+'
+
+# Ensure bogus --ignore-rev requests are caught
+test_expect_success 'validate --ignore-rev' '
+	test_must_fail git blame --ignore-rev X^{tree} file
+'
+
+# Ensure bogus --ignore-revs-file requests are caught
+test_expect_success 'validate --ignore-revs-file' '
+	git rev-parse X^{tree} >ignore_x &&
+	test_must_fail git blame --ignore-revs-file ignore_x file
+'
+
+for I in X XT
+do
+	# Ignore X (or XT), make sure A is blamed for line 1 and B for line 2.
+	# Giving X (i.e. commit) and XT (i.e. annotated tag to commit) should
+	# produce the same result.
+	test_expect_success "ignore_rev_changing_lines ($I)" '
+		git blame --line-porcelain --ignore-rev $I file >blame_raw &&
+
+		grep -E "^[0-9a-f]+ [0-9]+ 1" blame_raw | sed -e "s/ .*//" >actual &&
+		git rev-parse A >expect &&
+		test_cmp expect actual &&
+
+		grep -E "^[0-9a-f]+ [0-9]+ 2" blame_raw | sed -e "s/ .*//" >actual &&
+		git rev-parse B >expect &&
+		test_cmp expect actual
 	'
-
-# Ignore X, make sure A is blamed for line 1 and B for line 2.
-test_expect_success ignore_rev_changing_lines '
-	git blame --line-porcelain --ignore-rev X file >blame_raw &&
-
-	grep -E "^[0-9a-f]+ [0-9]+ 1" blame_raw | sed -e "s/ .*//" >actual &&
-	git rev-parse A >expect &&
-	test_cmp expect actual &&
-
-	grep -E "^[0-9a-f]+ [0-9]+ 2" blame_raw | sed -e "s/ .*//" >actual &&
-	git rev-parse B >expect &&
-	test_cmp expect actual
-	'
+done
 
 # For ignored revs that have added 'unblamable' lines, attribute those to the
 # ignored commit.
@@ -67,7 +84,7 @@
 
 	grep -E "^[0-9a-f]+ [0-9]+ 4" blame_raw | sed -e "s/ .*//" >actual &&
 	test_cmp expect actual
-	'
+'
 
 # Ignore X and Y, both in separate files.  Lines 1 == A, 2 == B.
 test_expect_success ignore_revs_from_files '
@@ -82,7 +99,7 @@
 	grep -E "^[0-9a-f]+ [0-9]+ 2" blame_raw | sed -e "s/ .*//" >actual &&
 	git rev-parse B >expect &&
 	test_cmp expect actual
-	'
+'
 
 # Ignore X from the config option, Y from a file.
 test_expect_success ignore_revs_from_configs_and_files '
@@ -96,7 +113,7 @@
 	grep -E "^[0-9a-f]+ [0-9]+ 2" blame_raw | sed -e "s/ .*//" >actual &&
 	git rev-parse B >expect &&
 	test_cmp expect actual
-	'
+'
 
 # Override blame.ignoreRevsFile (ignore_x) with an empty string.  X should be
 # blamed now for lines 1 and 2, since we are no longer ignoring X.
@@ -120,7 +137,7 @@
 	echo NOREV >ignore_norev &&
 	test_must_fail git blame file --ignore-revs-file ignore_norev 2>err &&
 	test_i18ngrep "invalid object name: NOREV" err
-	'
+'
 
 # For ignored revs that have added 'unblamable' lines, mark those lines with a
 # '*'
@@ -138,7 +155,7 @@
 
 	sed -n "4p" blame_raw | cut -c1 >actual &&
 	test_cmp expect actual
-	'
+'
 
 # Commit Z will touch the first two lines.  Y touched all four.
 # 	A--B--X--Y--Z
@@ -171,7 +188,7 @@
 
 	sed -n "4p" blame_raw | cut -c1 >actual &&
 	! test_cmp expect actual
-	'
+'
 
 # For ignored revs that added 'unblamable' lines and more recent commits changed
 # the blamable lines, mark the unblamable lines with a
@@ -190,7 +207,7 @@
 
 	sed -n "4p" blame_raw | cut -c1 >actual &&
 	test_cmp expect actual
-	'
+'
 
 # The heuristic called by guess_line_blames() tries to find the size of a
 # blame_entry 'e' in the parent's address space.  Those calculations need to
@@ -227,7 +244,7 @@
 	git tag C &&
 
 	git blame file --ignore-rev B >blame_raw
-	'
+'
 
 # Resetting the repo and creating:
 #
@@ -269,6 +286,6 @@
 	grep -E "^[0-9a-f]+ [0-9]+ 9" blame_raw | sed -e "s/ .*//" >actual &&
 	git rev-parse C >expect &&
 	test_cmp expect actual
-	'
+'
 
 test_done
diff --git a/t/t9832-unshelve.sh b/t/t9832-unshelve.sh
index e9276c4..7194fb2 100755
--- a/t/t9832-unshelve.sh
+++ b/t/t9832-unshelve.sh
@@ -29,8 +29,11 @@
 	)
 '
 
+# Create an initial clone, with a commit unrelated to the P4 change
+# on HEAD
 test_expect_success 'initial clone' '
-	git p4 clone --dest="$git" //depot/@all
+	git p4 clone --dest="$git" //depot/@all &&
+    test_commit -C "$git" "unrelated"
 '
 
 test_expect_success 'create shelved changelist' '
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index f990406..8d59b90 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -1628,3 +1628,36 @@
 	case "$("$SYSTEMROOT"/system32/attrib "$1")" in *H*?:*) return 0;; esac
 	return 1
 }
+
+# Check that the given command was invoked as part of the
+# trace2-format trace on stdin.
+#
+#	test_subcommand [!] <command> <args>... < <trace>
+#
+# For example, to look for an invocation of "git upload-pack
+# /path/to/repo"
+#
+#	GIT_TRACE2_EVENT=event.log git fetch ... &&
+#	test_subcommand git upload-pack "$PATH" <event.log
+#
+# If the first parameter passed is !, this instead checks that
+# the given command was not called.
+#
+test_subcommand () {
+	local negate=
+	if test "$1" = "!"
+	then
+		negate=t
+		shift
+	fi
+
+	local expr=$(printf '"%s",' "$@")
+	expr="${expr%,}"
+
+	if test -n "$negate"
+	then
+		! grep "\[$expr\]"
+	else
+		grep "\[$expr\]"
+	fi
+}
diff --git a/templates/hooks--pre-push.sample b/templates/hooks--pre-push.sample
index 6187dbf..4ce688d 100755
--- a/templates/hooks--pre-push.sample
+++ b/templates/hooks--pre-push.sample
@@ -14,7 +14,7 @@
 # Information about the commits which are being pushed is supplied as lines to
 # the standard input in the form:
 #
-#   <local ref> <local sha1> <remote ref> <remote sha1>
+#   <local ref> <local oid> <remote ref> <remote oid>
 #
 # This sample shows how to prevent push of commits where the log message starts
 # with "WIP" (work in progress).
@@ -22,27 +22,27 @@
 remote="$1"
 url="$2"
 
-z40=0000000000000000000000000000000000000000
+zero=$(git hash-object --stdin </dev/null | tr '[0-9a-f]' '0')
 
-while read local_ref local_sha remote_ref remote_sha
+while read local_ref local_oid remote_ref remote_oid
 do
-	if [ "$local_sha" = $z40 ]
+	if test "$local_oid" = "$zero"
 	then
 		# Handle delete
 		:
 	else
-		if [ "$remote_sha" = $z40 ]
+		if test "$remote_oid" = "$zero"
 		then
 			# New branch, examine all commits
-			range="$local_sha"
+			range="$local_oid"
 		else
 			# Update to existing branch, examine new commits
-			range="$remote_sha..$local_sha"
+			range="$remote_oid..$local_oid"
 		fi
 
 		# Check for WIP commit
-		commit=`git rev-list -n 1 --grep '^WIP' "$range"`
-		if [ -n "$commit" ]
+		commit=$(git rev-list -n 1 --grep '^WIP' "$range")
+		if test -n "$commit"
 		then
 			echo >&2 "Found WIP commit in $local_ref, not pushing"
 			exit 1
diff --git a/templates/hooks--update.sample b/templates/hooks--update.sample
index 5014c4b..c4d426b 100755
--- a/templates/hooks--update.sample
+++ b/templates/hooks--update.sample
@@ -60,7 +60,7 @@
 
 # --- Check types
 # if $newrev is 0000...0000, it's a commit to delete a ref.
-zero="0000000000000000000000000000000000000000"
+zero=$(git hash-object --stdin </dev/null | tr '[0-9a-f]' '0')
 if [ "$newrev" = "$zero" ]; then
 	newrev_type=delete
 else
diff --git a/trailer.c b/trailer.c
index 68dabc2..3f7391d 100644
--- a/trailer.c
+++ b/trailer.c
@@ -1183,3 +1183,39 @@
 	format_trailer_info(out, &info, opts);
 	trailer_info_release(&info);
 }
+
+void trailer_iterator_init(struct trailer_iterator *iter, const char *msg)
+{
+	struct process_trailer_options opts = PROCESS_TRAILER_OPTIONS_INIT;
+	strbuf_init(&iter->key, 0);
+	strbuf_init(&iter->val, 0);
+	opts.no_divider = 1;
+	trailer_info_get(&iter->info, msg, &opts);
+	iter->cur = 0;
+}
+
+int trailer_iterator_advance(struct trailer_iterator *iter)
+{
+	while (iter->cur < iter->info.trailer_nr) {
+		char *trailer = iter->info.trailers[iter->cur++];
+		int separator_pos = find_separator(trailer, separators);
+
+		if (separator_pos < 1)
+			continue; /* not a real trailer */
+
+		strbuf_reset(&iter->key);
+		strbuf_reset(&iter->val);
+		parse_trailer(&iter->key, &iter->val, NULL,
+			      trailer, separator_pos);
+		unfold_value(&iter->val);
+		return 1;
+	}
+	return 0;
+}
+
+void trailer_iterator_release(struct trailer_iterator *iter)
+{
+	trailer_info_release(&iter->info);
+	strbuf_release(&iter->val);
+	strbuf_release(&iter->key);
+}
diff --git a/trailer.h b/trailer.h
index 203acf4..cd93e7d 100644
--- a/trailer.h
+++ b/trailer.h
@@ -2,8 +2,7 @@
 #define TRAILER_H
 
 #include "list.h"
-
-struct strbuf;
+#include "strbuf.h"
 
 enum trailer_where {
 	WHERE_DEFAULT,
@@ -103,4 +102,46 @@
 void format_trailers_from_commit(struct strbuf *out, const char *msg,
 				 const struct process_trailer_options *opts);
 
+/*
+ * An interface for iterating over the trailers found in a particular commit
+ * message. Use like:
+ *
+ *   struct trailer_iterator iter;
+ *   trailer_iterator_init(&iter, msg);
+ *   while (trailer_iterator_advance(&iter))
+ *      ... do something with iter.key and iter.val ...
+ *   trailer_iterator_release(&iter);
+ */
+struct trailer_iterator {
+	struct strbuf key;
+	struct strbuf val;
+
+	/* private */
+	struct trailer_info info;
+	size_t cur;
+};
+
+/*
+ * Initialize "iter" in preparation for walking over the trailers in the commit
+ * message "msg". The "msg" pointer must remain valid until the iterator is
+ * released.
+ *
+ * After initializing, note that key/val will not yet point to any trailer.
+ * Call advance() to parse the first one (if any).
+ */
+void trailer_iterator_init(struct trailer_iterator *iter, const char *msg);
+
+/*
+ * Advance to the next trailer of the iterator. Returns 0 if there is no such
+ * trailer, and 1 otherwise. The key and value of the trailer can be
+ * fetched from the iter->key and iter->value fields (which are valid
+ * only until the next advance).
+ */
+int trailer_iterator_advance(struct trailer_iterator *iter);
+
+/*
+ * Release all resources associated with the trailer iteration.
+ */
+void trailer_iterator_release(struct trailer_iterator *iter);
+
 #endif /* TRAILER_H */
diff --git a/transport-helper.c b/transport-helper.c
index c52c99d..b573b6c 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -723,13 +723,61 @@
 	return -1;
 }
 
+struct push_update_ref_state {
+	struct ref *hint;
+	struct ref_push_report *report;
+	int new_report;
+};
+
 static int push_update_ref_status(struct strbuf *buf,
-				   struct ref **ref,
+				   struct push_update_ref_state *state,
 				   struct ref *remote_refs)
 {
 	char *refname, *msg;
 	int status, forced = 0;
 
+	if (starts_with(buf->buf, "option ")) {
+		struct object_id old_oid, new_oid;
+		const char *key, *val;
+		char *p;
+
+		if (!state->hint || !(state->report || state->new_report))
+			die(_("'option' without a matching 'ok/error' directive"));
+		if (state->new_report) {
+			if (!state->hint->report) {
+				state->hint->report = xcalloc(1, sizeof(struct ref_push_report));
+				state->report = state->hint->report;
+			} else {
+				state->report = state->hint->report;
+				while (state->report->next)
+					state->report = state->report->next;
+				state->report->next = xcalloc(1, sizeof(struct ref_push_report));
+				state->report = state->report->next;
+			}
+			state->new_report = 0;
+		}
+		key = buf->buf + 7;
+		p = strchr(key, ' ');
+		if (p)
+			*p++ = '\0';
+		val = p;
+		if (!strcmp(key, "refname"))
+			state->report->ref_name = xstrdup_or_null(val);
+		else if (!strcmp(key, "old-oid") && val &&
+			 !parse_oid_hex(val, &old_oid, &val))
+			state->report->old_oid = oiddup(&old_oid);
+		else if (!strcmp(key, "new-oid") && val &&
+			 !parse_oid_hex(val, &new_oid, &val))
+			state->report->new_oid = oiddup(&new_oid);
+		else if (!strcmp(key, "forced-update"))
+			state->report->forced_update = 1;
+		/* Not update remote namespace again. */
+		return 1;
+	}
+
+	state->report = NULL;
+	state->new_report = 0;
+
 	if (starts_with(buf->buf, "ok ")) {
 		status = REF_STATUS_OK;
 		refname = buf->buf + 3;
@@ -785,16 +833,16 @@
 		}
 	}
 
-	if (*ref)
-		*ref = find_ref_by_name(*ref, refname);
-	if (!*ref)
-		*ref = find_ref_by_name(remote_refs, refname);
-	if (!*ref) {
+	if (state->hint)
+		state->hint = find_ref_by_name(state->hint, refname);
+	if (!state->hint)
+		state->hint = find_ref_by_name(remote_refs, refname);
+	if (!state->hint) {
 		warning(_("helper reported unexpected status of %s"), refname);
 		return 1;
 	}
 
-	if ((*ref)->status != REF_STATUS_NONE) {
+	if (state->hint->status != REF_STATUS_NONE) {
 		/*
 		 * Earlier, the ref was marked not to be pushed, so ignore the ref
 		 * status reported by the remote helper if the latter is 'no match'.
@@ -803,9 +851,11 @@
 			return 1;
 	}
 
-	(*ref)->status = status;
-	(*ref)->forced_update |= forced;
-	(*ref)->remote_status = msg;
+	if (status == REF_STATUS_OK)
+		state->new_report = 1;
+	state->hint->status = status;
+	state->hint->forced_update |= forced;
+	state->hint->remote_status = msg;
 	return !(status == REF_STATUS_OK);
 }
 
@@ -813,37 +863,57 @@
 				    struct ref *remote_refs,
 				    int flags)
 {
+	struct ref *ref;
+	struct ref_push_report *report;
 	struct strbuf buf = STRBUF_INIT;
-	struct ref *ref = remote_refs;
-	int ret = 0;
+	struct push_update_ref_state state = { remote_refs, NULL, 0 };
 
 	for (;;) {
-		char *private;
-
 		if (recvline(data, &buf)) {
-			ret = 1;
-			break;
+			strbuf_release(&buf);
+			return 1;
 		}
-
 		if (!buf.len)
 			break;
-
-		if (push_update_ref_status(&buf, &ref, remote_refs))
-			continue;
-
-		if (flags & TRANSPORT_PUSH_DRY_RUN || !data->rs.nr || data->no_private_update)
-			continue;
-
-		/* propagate back the update to the remote namespace */
-		private = apply_refspecs(&data->rs, ref->name);
-		if (!private)
-			continue;
-		update_ref("update by helper", private, &ref->new_oid, NULL,
-			   0, 0);
-		free(private);
+		push_update_ref_status(&buf, &state, remote_refs);
 	}
 	strbuf_release(&buf);
-	return ret;
+
+	if (flags & TRANSPORT_PUSH_DRY_RUN || !data->rs.nr || data->no_private_update)
+		return 0;
+
+	/* propagate back the update to the remote namespace */
+	for (ref = remote_refs; ref; ref = ref->next) {
+		char *private;
+
+		if (ref->status != REF_STATUS_OK)
+			continue;
+
+		if (!ref->report) {
+			private = apply_refspecs(&data->rs, ref->name);
+			if (!private)
+				continue;
+			update_ref("update by helper", private, &(ref->new_oid),
+				   NULL, 0, 0);
+			free(private);
+		} else {
+			for (report = ref->report; report; report = report->next) {
+				private = apply_refspecs(&data->rs,
+							 report->ref_name
+							 ? report->ref_name
+							 : ref->name);
+				if (!private)
+					continue;
+				update_ref("update by helper", private,
+					   report->new_oid
+					   ? report->new_oid
+					   : &(ref->new_oid),
+					   NULL, 0, 0);
+				free(private);
+			}
+		}
+	}
+	return 0;
 }
 
 static void set_common_push_options(struct transport *transport,
diff --git a/transport.c b/transport.c
index 43e24bf..ffe2115 100644
--- a/transport.c
+++ b/transport.c
@@ -432,38 +432,67 @@
 	return 0;
 }
 
-void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
+static void update_one_tracking_ref(struct remote *remote, char *refname,
+				    struct object_id *new_oid, int deletion,
+				    int verbose)
 {
 	struct refspec_item rs;
 
-	if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
-		return;
-
 	memset(&rs, 0, sizeof(rs));
-	rs.src = ref->name;
+	rs.src = refname;
 	rs.dst = NULL;
 
 	if (!remote_find_tracking(remote, &rs)) {
 		if (verbose)
 			fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
-		if (ref->deletion) {
+		if (deletion)
 			delete_ref(NULL, rs.dst, NULL, 0);
-		} else
-			update_ref("update by push", rs.dst, &ref->new_oid,
+		else
+			update_ref("update by push", rs.dst, new_oid,
 				   NULL, 0, 0);
 		free(rs.dst);
 	}
 }
 
+void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
+{
+	char *refname;
+	struct object_id *new_oid;
+	struct ref_push_report *report;
+
+	if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
+		return;
+
+	report = ref->report;
+	if (!report)
+		update_one_tracking_ref(remote, ref->name, &ref->new_oid,
+					ref->deletion, verbose);
+	else
+		for (; report; report = report->next) {
+			refname = report->ref_name ? (char *)report->ref_name : ref->name;
+			new_oid = report->new_oid ? report->new_oid : &ref->new_oid;
+			update_one_tracking_ref(remote, refname, new_oid,
+						is_null_oid(new_oid), verbose);
+		}
+}
+
 static void print_ref_status(char flag, const char *summary,
 			     struct ref *to, struct ref *from, const char *msg,
+			     struct ref_push_report *report,
 			     int porcelain, int summary_width)
 {
+	const char *to_name;
+
+	if (report && report->ref_name)
+		to_name = report->ref_name;
+	else
+		to_name = to->name;
+
 	if (porcelain) {
 		if (from)
-			fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
+			fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to_name);
 		else
-			fprintf(stdout, "%c\t:%s\t", flag, to->name);
+			fprintf(stdout, "%c\t:%s\t", flag, to_name);
 		if (msg)
 			fprintf(stdout, "%s (%s)\n", summary, msg);
 		else
@@ -477,9 +506,11 @@
 		fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 			summary, reset);
 		if (from)
-			fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
+			fprintf(stderr, "%s -> %s",
+				prettify_refname(from->name),
+				prettify_refname(to_name));
 		else
-			fputs(prettify_refname(to->name), stderr);
+			fputs(prettify_refname(to_name), stderr);
 		if (msg) {
 			fputs(" (", stderr);
 			fputs(msg, stderr);
@@ -489,24 +520,52 @@
 	}
 }
 
-static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
+static void print_ok_ref_status(struct ref *ref,
+				struct ref_push_report *report,
+				int porcelain, int summary_width)
 {
+	struct object_id *old_oid;
+	struct object_id *new_oid;
+	const char *ref_name;
+	int forced_update;
+
+	if (report && report->old_oid)
+		old_oid = report->old_oid;
+	else
+		old_oid = &ref->old_oid;
+	if (report && report->new_oid)
+		new_oid = report->new_oid;
+	else
+		new_oid = &ref->new_oid;
+	if (report && report->forced_update)
+		forced_update = report->forced_update;
+	else
+		forced_update = ref->forced_update;
+	if (report && report->ref_name)
+		ref_name = report->ref_name;
+	else
+		ref_name = ref->name;
+
 	if (ref->deletion)
 		print_ref_status('-', "[deleted]", ref, NULL, NULL,
-				 porcelain, summary_width);
-	else if (is_null_oid(&ref->old_oid))
+				 report, porcelain, summary_width);
+	else if (is_null_oid(old_oid))
 		print_ref_status('*',
-			(starts_with(ref->name, "refs/tags/") ? "[new tag]" :
-			"[new branch]"),
-			ref, ref->peer_ref, NULL, porcelain, summary_width);
+				 (starts_with(ref_name, "refs/tags/")
+				  ? "[new tag]"
+				  : (starts_with(ref_name, "refs/heads/")
+				     ? "[new branch]"
+				     : "[new reference]")),
+				 ref, ref->peer_ref, NULL,
+				 report, porcelain, summary_width);
 	else {
 		struct strbuf quickref = STRBUF_INIT;
 		char type;
 		const char *msg;
 
-		strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
+		strbuf_add_unique_abbrev(&quickref, old_oid,
 					 DEFAULT_ABBREV);
-		if (ref->forced_update) {
+		if (forced_update) {
 			strbuf_addstr(&quickref, "...");
 			type = '+';
 			msg = "forced update";
@@ -515,16 +574,17 @@
 			type = ' ';
 			msg = NULL;
 		}
-		strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
+		strbuf_add_unique_abbrev(&quickref, new_oid,
 					 DEFAULT_ABBREV);
 
 		print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
-				 porcelain, summary_width);
+				 report, porcelain, summary_width);
 		strbuf_release(&quickref);
 	}
 }
 
-static int print_one_push_status(struct ref *ref, const char *dest, int count,
+static int print_one_push_report(struct ref *ref, const char *dest, int count,
+				 struct ref_push_report *report,
 				 int porcelain, int summary_width)
 {
 	if (!count) {
@@ -536,65 +596,89 @@
 	switch(ref->status) {
 	case REF_STATUS_NONE:
 		print_ref_status('X', "[no match]", ref, NULL, NULL,
-				 porcelain, summary_width);
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_REJECT_NODELETE:
 		print_ref_status('!', "[rejected]", ref, NULL,
 				 "remote does not support deleting refs",
-				 porcelain, summary_width);
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_UPTODATE:
 		print_ref_status('=', "[up to date]", ref,
-				 ref->peer_ref, NULL, porcelain, summary_width);
+				 ref->peer_ref, NULL,
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_REJECT_NONFASTFORWARD:
 		print_ref_status('!', "[rejected]", ref, ref->peer_ref,
-				 "non-fast-forward", porcelain, summary_width);
+				 "non-fast-forward",
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_REJECT_ALREADY_EXISTS:
 		print_ref_status('!', "[rejected]", ref, ref->peer_ref,
-				 "already exists", porcelain, summary_width);
+				 "already exists",
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_REJECT_FETCH_FIRST:
 		print_ref_status('!', "[rejected]", ref, ref->peer_ref,
-				 "fetch first", porcelain, summary_width);
+				 "fetch first",
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_REJECT_NEEDS_FORCE:
 		print_ref_status('!', "[rejected]", ref, ref->peer_ref,
-				 "needs force", porcelain, summary_width);
+				 "needs force",
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_REJECT_STALE:
 		print_ref_status('!', "[rejected]", ref, ref->peer_ref,
-				 "stale info", porcelain, summary_width);
+				 "stale info",
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_REJECT_SHALLOW:
 		print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 				 "new shallow roots not allowed",
-				 porcelain, summary_width);
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_REMOTE_REJECT:
 		print_ref_status('!', "[remote rejected]", ref,
 				 ref->deletion ? NULL : ref->peer_ref,
-				 ref->remote_status, porcelain, summary_width);
+				 ref->remote_status,
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_EXPECTING_REPORT:
 		print_ref_status('!', "[remote failure]", ref,
 				 ref->deletion ? NULL : ref->peer_ref,
 				 "remote failed to report status",
-				 porcelain, summary_width);
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_ATOMIC_PUSH_FAILED:
 		print_ref_status('!', "[rejected]", ref, ref->peer_ref,
-				 "atomic push failed", porcelain, summary_width);
+				 "atomic push failed",
+				 report, porcelain, summary_width);
 		break;
 	case REF_STATUS_OK:
-		print_ok_ref_status(ref, porcelain, summary_width);
+		print_ok_ref_status(ref, report, porcelain, summary_width);
 		break;
 	}
 
 	return 1;
 }
 
+static int print_one_push_status(struct ref *ref, const char *dest, int count,
+				 int porcelain, int summary_width)
+{
+	struct ref_push_report *report;
+	int n = 0;
+
+	if (!ref->report)
+		return print_one_push_report(ref, dest, count,
+					     NULL, porcelain, summary_width);
+
+	for (report = ref->report; report; report = report->next)
+		print_one_push_report(ref, dest, count + n++,
+				      report, porcelain, summary_width);
+	return n;
+}
+
 static int measure_abbrev(const struct object_id *oid, int sofar)
 {
 	char hex[GIT_MAX_HEXSZ + 1];
diff --git a/tree-diff.c b/tree-diff.c
index 6ebad1a..7cebbb3 100644
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -434,7 +434,7 @@
 		if (diff_can_quit_early(opt))
 			break;
 
-		if (opt->max_changes && opt->num_changes > opt->max_changes)
+		if (opt->max_changes && diff_queued_diff.nr > opt->max_changes)
 			break;
 
 		if (opt->pathspec.nr) {
@@ -521,7 +521,6 @@
 
 			/* t↓ */
 			update_tree_entry(&t);
-			opt->num_changes++;
 		}
 
 		/* t > p[imin] */
@@ -539,7 +538,6 @@
 		skip_emit_tp:
 			/* ∀ pi=p[imin]  pi↓ */
 			update_tp_entries(tp, nparent);
-			opt->num_changes++;
 		}
 	}
 
@@ -557,7 +555,6 @@
 	const struct object_id **parents_oid, int nparent,
 	struct strbuf *base, struct diff_options *opt)
 {
-	opt->num_changes = 0;
 	p = ll_diff_tree_paths(p, oid, parents_oid, nparent, base, opt);
 
 	/*