git-gui: Added support for OS X right click

OS X sends Button-2 on a "real" right click, such as with a three
button mouse, or by using the two-finger trackpad click.

Signed-off-by: Väinö Järvelä <>
Signed-off-by: Shawn O. Pearce <>
diff --git a/ b/
index 2c7eb3c..29a790e 100755
--- a/
+++ b/
@@ -1348,6 +1348,9 @@
 proc bind_button3 {w cmd} {
 	bind $w <Any-Button-3> $cmd
 	if {[is_MacOSX]} {
+		# Mac OS X sends Button-2 on right click through three-button mouse,
+		# or through trackpad right-clicking (two-finger touch + click).
+		bind $w <Any-Button-2> $cmd
 		bind $w <Control-Button-1> $cmd