Re: vc commit clears undo history

[Sam Steingold]

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David Kastrup wrote:
> "Sam Steingold" <address@hidden> writes:
> 
>> GNU Emacs 23.0.50.29 (x86_64-unknown-linux-gnu, GTK+ Version 2.8.20)
>>  of 2007-12-03 on nyc-qws-005
>>  '-with-gtk' '-with-gif=no'
>>
>> a long-standing bug (bad feature?) is that when a file is committed
>> using vc (C-x v v) or pcvs (c in *cvs* buffer), it buffer's undo history
>> is discarder.
> 
> I think the rationale for that might be that in order to have the files
> identifiable as unmodified, some version control systems might do a
> recheckout on them, and replace strings like $Id: whatever$ with
> different information.  In any case, a revert-buffer is done on the file
> after checking it in, I believe.
> 
> It might not be easy to get consistent undo information in this case.

fwiw, "other vc interfaces", such as dvc (which interfaces to
distributed VCs (haz/hg/git &c), do not discard the undo information
after a commit.
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