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bug#6487: using vc-annotate-find-revision-at-line for renamed/removed fi


From: Dan Nicolaescu
Subject: bug#6487: using vc-annotate-find-revision-at-line for renamed/removed files
Date: Mon, 21 Jun 2010 16:41:29 -0400
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux)

vc-annotate for git and mercurial shows the original file name for a
change, even if the file has been renamed meanwhile.
Using `vc-annotate-find-revision-at-line' on such a line in the annotate does 
not work

vc-annotate-find-revision-at-line calls vc-find-revision for a file
that does not exist anymore.
vc-find-revision in turn does a:
(vc-call find-revision file revision outbuf)
but given that the file does not exist anymore, no VC backend claims
the file, so the vc-call fails

vc-annotate-find-revision-at-line knows what VC backend it needs to
call, so it could pass it as an optional argument to vc-find-revision.





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