GNU bug report logs - #79311
31.0.50; Some characters not displayed when using standard-display-table

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Andy Moreton <andrewjmoreton <at> gmail.com>
Cc: 79311 <at> debbugs.gnu.org
Subject: bug#79311: 31.0.50; Some characters not displayed when using standard-display-table
Date: Wed, 27 Aug 2025 05:29:05 +0300

merge 79311 79317
thanks

> From: Andy Moreton <andrewjmoreton <at> gmail.com>
> Date: Tue, 26 Aug 2025 21:29:04 +0100
> 
> On Tue 26 Aug 2025, Eli Zaretskii wrote:
> 
> >> From: Andy Moreton <andrewjmoreton <at> gmail.com>
> >> Date: Tue, 26 Aug 2025 08:57:36 +0100
> >> 
> >> On Tue 26 Aug 2025, Eli Zaretskii wrote:
> >> 
> >> >> From: Andy Moreton <andrewjmoreton <at> gmail.com>
> >> >> Date: Mon, 25 Aug 2025 22:15:54 +0100
> >> >> 
> >> >> On Mon 25 Aug 2025, Eli Zaretskii wrote:
> >> >> 
> >> >> >> From: Matija Obid <matija.obid <at> posteo.net>
> >> >> >> Date: Mon, 25 Aug 2025 16:07:46 +0000
> >> >> >> 
> >> >> >> Steps to reproduce:
> >> >> >> $ emacs -Q
> >> >> >> #+begin_src elisp
> >> >> >> (setq standard-display-table (make-display-table))
> >> >> >> (aset standard-display-table ?> [?\〉])
> >> >> >> (switch-to-buffer ">")
> >> >> >> #+end_src
> >> >> >
> >> >> >> 
> >> >> >> The buffer name in modeline is displayed as a square instead of parenthesis.
> >> >> >
> >> >> > Thanks, should be fixed now.
> >> >> 
> >> >> This seems to cause display glitches in gnus on Windows, when using
> >> >> non-ASCII chars for the indicators in gnus-sum-thread-tree-* variables.
> >> >> These glitches did no occur in a build from two days ago.
> >> >> 
> >> >> The symptom is the gnus summary buffer displays \xe2 characters, instead
> >> >> of the expected character, e.g. WHITE SQUARE (codepoint #x25a1) which
> >> >> has buffer code #xE2 #x96 #xA1.
> >> >> 
> >> >> The wrong display is transient, in that moving the cursor over the wrong
> >> >> display fixes the glitch.
> >> >
> >> > Thanks, but please show a recipe starting from "emacs -Q", so I could
> >> > look into this.
> >> 
> >> I can try, but it will take significant effort to produce such a
> >> a restricted config.
> >> 
> >> After reverting only commit 21b072c60744 ("Fix use of display-table for
> >> mode-line display") and rebuilding then the gnus summary buffer display
> >> works as expected.
> >
> > I didn't doubt that the problem was with that change, I just didn't
> > know how it could harm the Gnus summary buffer, which I never use,
> > especially since your report seemed to indicate that you customized
> > the indicators (the defaults are all ASCII characters).
> >
> > I hope the fix I installed for bug#79317 also fixes this problem.  If
> > not, please describe what else is left to fix after that change.
> 
> Thanks Eli, the display appears to be as expected now.

Great, so I'm merging those bugs.

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