bug#27953: vc-region-history doesn't follow renames

[Clément Pit--Claudel]

X-Debbugs-CC: monnier@iro.umontreal.ca

Hi bug-gnu-emacs,

vc-git-region-history currently stops at the first rename, instead of 
continuing across renames.  This is because it doesn't pass --follow to git.  
The original author put the required option "--follow" in a comment, adding 
"FIXME: not supported?".

Indeed, `git log -p --follow -L5,25:file.c' doesn't work.  But `git log -p 
--follow -L5,25:file.c file.c' does work (note the extra mention of the file 
name).

Any arguments against the attached patch?

(CCing Stefan, since you're the last one who modified this function)

Clément.

0001-Follow-renames-in-vc-git-region-history.patch
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