git.el: Added a function to diff against the other heads in a merge.
git-diff-file-merge-head generates a diff against the first merge head, or with a prefix argument against the nth head. Bound to `d h' by default. Signed-off-by: NAlexandre Julliard <julliard@winehq.org> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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