bug#20637: incompatible, undocumented change to vc-working-revision

[Dmitry Gutov]

On 04/14/2016 10:10 AM, Michael Albinus wrote:

> And I still feel unhappy that none of the active Emacs maintainers feels
> responsible for vc*.el.

I do feel responsible, and I try to take care of most bug reports in 
that area.

> I'm trying to support fixing problems here, but
> most of the code, and the VCSes being used, are still terra incognita for me.

It would be great if the problems we're fixing were formulated like "VC 
behaves like this, and it causes that problem in practice (or could 
cause, at least)", rather than "here is a test case, and I feel it 
should pass". I think that would encourage more practical choices.