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5c838d23aa
When displaying diffs in a submodule, this makes gitk display the headlines of the commits being diffed, instead of just showing not-quite-helpful SHA-1 pairs, if the underlying git installation supports this. That makes it much easier to evaluate the changes, as it eliminates the need to start a gitk inside the submodule and use the superprojects hashes there to find out what the commits are about. Since the --submodule option of git diff is new in git version 1.6.6, this only uses the --submodule option when a git version of 1.6.6 or higher is detected. Signed-off-by: Jens Lehmann <Jens.Lehmann@web.de> Signed-off-by: Paul Mackerras <paulus@samba.org>