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

[Michael Albinus]

Dmitry Gutov <dgutov@yandex.ru> writes:

>> I've committed this to emacs-25. Plus commenting the now failing checks
>> in vc-tests.el.
>
> We should also consider reverting the changes to vc-rcs-unregister and
> vc-sccs-working-revision. They don't seem particularly necessary (the
> tests pass without them).

As you know I'm conservative with the emacs-25 branch. Is it absolutely
necessary that we do this?

Best regards, Michael.