bug#39380: 26.3: Opening files in vc-dir-mode with differing root and working dir fails

[Dmitry Gutov]

On 03.02.2020 1:35, Wolfgang Scherer wrote:
> Am 01.02.20 um 08:20 schrieb Dmitry Gutov:
> > On 01.02.2020 3:13, Wolfgang Scherer wrote:
> > > 3. Press `C-x v d RET`, which will show a "Working dir" different from "Root":
> > >
> > >      .. code-block:: text
> > >
> > >         Working dir: check-hgs/sub1/
> > >         Root       : check-hgs
> > >
> > >                              ./
> > >                              sub1/
> > >         unregistered         sub1/a
> > >                              sub2/
> > >         unregistered         sub2/x
> >
> > Maybe this should be fixed in vc-hg-status-files by not showing "outside" files 
> > and using proper relative names.
> >
> > Compare how VC-Dir works with Git: when you open it in a subdirectory, it only 
> > shows changed files in that directory, and with proper relative names.
>
> The behavior should be consistent.

Right.

> In Emacs 24/25 vc-dir-mode for Mercurial behaved exactly like Git. Since the 
> behavior for Mercurial changed some time after Emacs 24, I just assumed 
> (probably because of my bias towards `dvc`) that the new behavior was intended.

In 25 or 26 Daniel added a Lisp-based faster implementation for some 
commands (de76a167dc09dc695a5acebabb7ab354a6bf556e) since apparently Hg 
itself was too slow.

So this bug must have arrived with that implementation.