Add prefix oriented completions for diff and format-patch commands.
Add prefix oriented completions for diff and format-patch commands.

Signed-off-by: Pascal Obry <de9b8d32d21ac4abee992cab0591365746b5103f@obry.net>
Acked-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git