GNU bug report logs - #78819
31.0.50; Inconsistent behavior of vc commands in various major modes

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Kristoffer Balintona <krisbalintona <at> gmail.com>, Sean Whitton <spwhitton <at> spwhitton.name>
Cc: 78819 <at> debbugs.gnu.org
Subject: bug#78819: 31.0.50; Inconsistent behavior of vc commands in various major modes
Date: Sat, 28 Jun 2025 12:20:36 +0300

> From: Kristoffer Balintona <krisbalintona <at> gmail.com>
> Date: Tue, 17 Jun 2025 15:19:57 -0700
> 
> Hi,
> 
> I noticed that in vc-dir buffers the behavior of certain commands are
> inconsistent with respect to which backend is used. That is, some
> commands operate according to the backend returned by
> `vc-deduce-backend’ while others operate according to the backend
> returned by `vc-responsible-backend’. I will explain below.
> 
> (After looking into it, I realized that this also effects other major
> modes specially considered by `vc-deduce-backend’, which vc-dir-mode is
> just one of. They include: log-view-mode, log-edit-mode, diff-mode, and
> the modes specified in `vc-deduce-backend-nonvc-modes’. Although the
> explanation below is written with the behavior specifically in vc-dir
> buffers, it should also apply to the other major modes I’ve listed
> above.)
> 
> The difference in vc-dir buffers is that `vc-deduce-backend’ considers
> the backend associated with the current vc-dir buffer, whereas
> `vc-responsible-backend’ takes in a file and infers the backend
> associated with it. Most of the time these two should be the same, but
> not always: sometimes users may call `vc-dir’ with a universal argument
> to choose which backend a new vc-dir buffer should use. In this case,
> the backend returned by `vc-deduce-backend’ will differ from that of
> `vc-responsible-backend’.
> 
> At least the following commands behave correctly, using
> `vc-deduce-backend’: `vc-print-root-log’, `vc-print-log’,
> `vc-log-outgoing’, `vc-log-incoming’, `vc-log-mergebase’, and
> `vc-diff-mergebase’ work. Other commands behave incorrectly:
> `vc-switch-branch’ and `vc-retrieve-tag’. Perhaps there are more.
> 
> If I’m not mistaken, I can try sending over a patch trying to correct
> the behavior of the misbehaving commands. In that case, I’d appreciate
> if others mention any other commands I’ve not listed above that are
> misbehaving so I don’t miss them in the patch.

Thanks.

Sean, any comments?

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