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

[Andy Moreton]

On Sat 06 Nov 2021, Lars Ingebrigtsen wrote:

> Manuel Giraud <manuel@ledu-giraud.fr> writes:
>
>> This patch solves this issue by selecting the backend with the most
>> specific (in fact, the longest string) path to the file.
>
> I think this makes sense (it makes things more consistent and logical),
> and Dmitry agrees, so I've now applied this to Emacs 29.  We'll see
> whether anybody complains.

Picking the more specific filename is good, but the longest string is
the wrong measure: what is wanted is the deepest path. For example:

  verylongdirname/foo
  a/b/c/foo

The second is a shorter string, but more specific.

    AndyM