bug#46358: 28.0.50; [PATCH] Add vc-dir faces; also apply them to vc-git

[Juri Linkov]

>> Very well!  I am doing just that in the revised patch.  So there should
>> be no visual difference between this and the prior state, except for one
>> case: the empty Git stash header, which will ultimately inherit from
>> 'shadow' (before there was a "FIXME" to disambiguate it from other
>> header values).
>
> Looks good to me; pushed to Emacs 28 now.

I don't know if anyone else has such problem, but now highlighting
the empty Git stash header with a different color distinguishes it
from other header lines, and thus attracts more attention.
So now the most noticeable thing in the vc-dir is the Git stash header
(that I almost never use).

Maybe better to display the empty Git stash header using the default
colors, and then highlight it differently only when it's non-empty?