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

[Andrii Kolomoiets]

Dmitry Gutov <dgutov@yandex.ru> writes:

> On 18.09.2020 12:30, Andrii Kolomoiets wrote:
>> Calling `vc-git-revert` or `vc-hg-revert` directly with repo root or any
>> directory within repo works fine.
>
> True. That's how Git and Hg work anyway.
>
> I'm not saying the current situation is ideal, but we'd either have to
> give up any attempt to revert a directory (with a more appropriate
> message), or somehow differentiate between different backends where it
> would or wouldn't work.

BTW vc-revert is also works fine in Git repo when point is on
subdirectory.  So for the vc-git only reverting repo root is not
working.

Please see attached patch which make it possible for vc-hg to revert
directory.

0001-vc-Treat-directory-as-registered.patch
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