bug#50572: 28.0.50; [PATCH] fix VC to find the responsible backend with the most specific path.

[Eli Zaretskii]

> Cc: 50572@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Tue, 14 Sep 2021 02:48:11 +0300
> 
> >> This patch solves this issue by selecting the backend with the most
> >> specific (in fact, the longest string) path to the file.
> > Isn't that already available with "C-u C-x v v"?
> 
> A better default is an improvement anyway.

But it looks like we've lost that feature of "C-x v v" somehow,
because it doesn't seem to work here.  Which is too bad.