bug#43464: 28.0.50; vc: Error calling vc-revert for repo root

[Andrii Kolomoiets]

Andrii Kolomoiets <andreyk.mad@gmail.com> writes:

> Dmitry Gutov <dgutov@yandex.ru> writes:
>> Could you explain both changes in that patch?
>
> The idea is to make the 'vc-backend' function to return backend for
> directory.
>
> `vc-backend` should return correct backend for directory and the
> behavior of `vc-registered` must be kept unchanged.

Please see attached patch.

0001-vc-backend-for-directory.patch
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