bug#52158: 29.0.50; Add key binding fo vc-git-stash

[Lars Ingebrigtsen]

Dmitry Gutov <dgutov@yandex.ru> writes:

> OTOH, for better user experience this will probably require
> duplicating the contents of vc-dir-mode's docstring. Or would adding a
> reference to it suffice?

Does a derived mode give us anything more than a minor mode would?  We
basically need a place to put helpful text in the doc string, as well as
binding some Git-specific commands, and that seems like a perfect fit
for a minor mode.

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