GNU bug report logs - #45581
28.0.50; C-M-v in xref buffers shows a different buffer when scrolling

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#45581: closed (28.0.50; C-M-v in xref buffers shows a
 different buffer when scrolling)
Date: Sat, 02 Jan 2021 18:59:01 +0000

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Your message dated Sat, 2 Jan 2021 20:58:24 +0200
with message-id <bd8c2ec0-0c9f-b13b-79cb-aad90202e7b4 <at> yandex.ru>
and subject line Re: bug#45581: 28.0.50; C-M-v in xref buffers shows a different buffer when scrolling
has caused the debbugs.gnu.org bug report #45581,
regarding 28.0.50; C-M-v in xref buffers shows a different buffer when scrolling
to be marked as done.

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From: Daniel Martín <mardani29 <at> yahoo.es>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; C-M-v in xref buffers shows a different buffer when scrolling
Date: Thu, 31 Dec 2020 23:51:38 +0100

Steps to reproduce the problem:

1. emacs -Q
2. Open any file with source code (for example, xdisp.c).
3. Place the point in any symbol (for example, redisplay_internal).
4. Press M-? (`xref-find-references').
5. In the *xref* buffer, press n (`xref-next-line').
6. Press C-h m (`describe-mode').
7. Press C-M-v to scroll the help window.

Expected results:

The mode description window scrolls as usual.

Actual results:

The buffer with the file that contains the selected xref item replaces
the *Help* buffer and is scrolled instead.

I can't reproduce the same behavior in *grep* buffers.

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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: martin rudalics <rudalics <at> gmx.at>, Daniel Martín
 <mardani29 <at> yahoo.es>, 45581-done <at> debbugs.gnu.org
Subject: Re: bug#45581: 28.0.50; C-M-v in xref buffers shows a different
 buffer when scrolling
Date: Sat, 2 Jan 2021 20:58:24 +0200

Version: 28.1

On 02.01.2021 10:25, martin rudalics wrote:
> Probably.  'cvs-temp-buffer' has a similar note:
> 
>        ;; FIXME: this doesn't do the right thing if the user later on
>        ;; does a `find-file-other-window' and `scroll-other-window'
>        (setq-local other-window-scroll-buffer buf))
> 
> I don't use C-M-v so I can't tell whether 'other-window-scroll-buffer'
> was ever useful in the first place for *xref*.

Great, so we can remove it (pushed as 6b10ce867f).

As a result, C-M-v doesn't always scroll the "target location" window 
anymore (at least, not when there are at least 3 windows on the frame).

I wonder if we can/should do something about it. Other standard commands 
don't seem to worry about that, though.

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