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bug#6870: Make vc-root-diff work in more modes


From: Chong Yidong
Subject: bug#6870: Make vc-root-diff work in more modes
Date: Tue, 05 Jul 2011 16:58:14 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

Stefan Monnier <address@hidden> writes:

>> What about all buffers that have file names?  A la
>
>> (and (buffer-file-name)
>>      (vc-responsible-backend default-directory))
>
> That'd be fine, yes.

But this might be confusing, since this check would not trigger for
non-file buffers generated from those file buffers.

i.e., if you have a buffer with a file name that is not handled by VC,
vc-root-diff would work for that buffer but not for a diff file
generated from that buffer.

Whereas if a buffer with a file name *is* handled by VC, vc-root-diff
would work for both that buffer and a diff file generated for that
buffer.





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