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

From: Wolfgang Scherer
Subject: bug#39380: 26.3: Opening files in vc-dir-mode with differing root and working dir fails
Date: Sun, 2 Feb 2020 23:35:42 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1

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. 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.

I really have no preference how the faulty behavior is fixed, since I have long 
since defined some advice before `vc-dir-prepare-status-buffer`. I have also 
not checked the documentation to find out what the intended behavior is.

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