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

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Matija Obid <matija.obid <at> posteo.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Some characters not displayed when using
 standard-display-table
Date: Mon, 25 Aug 2025 16:07:46 +0000

Hello,

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.
Note that: If I switch buffer with "C-x b > RET" buffer name is
displayed correctly.


In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, Motif Version 2.3.8,
cairo version 1.18.4)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101015
System Description: Guix System

Configured using:
 'configure
 CONFIG_SHELL=/gnu/store/nnx8iifrj6jfih4sivivq17cf65aa968-bash-minimal-5.2.37/bin/bash
 SHELL=/gnu/store/nnx8iifrj6jfih4sivivq17cf65aa968-bash-minimal-5.2.37/bin/bash
 --prefix=/gnu/store/kpxqlh6wx83p8wqfzzggnjr0vc1ppr3v-emacs-master-31.0.50
 --enable-fast-install --with-x-toolkit=motif --with-imagemagick
 --without-xim --with-cairo --with-modules --with-native-compilation=aot
 'CFLAGS=-g -O2 -Wno-error=incompatible-pointer-types'
 --disable-build-details'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT
MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND
SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM
XINERAMA XINPUT2 XPM XRANDR MOTIF ZLIB

Important settings:
  value of $EMACSLOADPATH: /run/current-system/profile/share/emacs/site-lisp:/gnu/store/kpxqlh6wx83p8wqfzzggnjr0vc1ppr3v-emacs-master-31.0.50/share/emacs/31.0.50/lisp:/gnu/store/kpxqlh6wx83p8wqfzzggnjr0vc1ppr3v-emacs-master-31.0.50/share/emacs/31.0.50/lisp
  value of $LC_TIME: sl_SI.utf8
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: @im=exwm-xim
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-regexp-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/gnu/store/y118fz0hp27mkyzmgpg4p5jv98n5ibdh-emacs-compat-30.0.2.0/share/emacs/site-lisp/compat-30.0.2.0/compat hides /gnu/store/kpxqlh6wx83p8wqfzzggnjr0vc1ppr3v-emacs-master-31.0.50/share/emacs/31.0.50/lisp/emacs-lisp/compat

Features:
(shadow sort mail-extr compile comint ansi-osc ansi-color ring comp-run
bytecomp byte-compile comp-common rx emacsbug lisp-mnt message mailcap
yank-media puny dired dired-loaddefs rfc822 mml mml-sec password-cache
epa derived epg rfc6068 epg-config gnus-util text-property-search
time-date subr-x mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader cl-loaddefs cl-lib sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils rmc iso-transl tooltip
cconv eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/x-win x-win term/common-win x-dnd touch-screen
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer nadvice seq
simple cl-generic indonesian philippine cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs theme-loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo motif x-toolkit xinput2 x multi-tty move-toolbar
make-network-process tty-child-frames native-compile emacs)

Memory information:
((conses 16 68013 13350) (symbols 48 6841 0) (strings 32 17773 2067)
 (string-bytes 1 659744) (vectors 16 10969)
 (vector-slots 8 152397 8095) (floats 8 24 2) (intervals 56 303 10)
 (buffers 1064 12))

-- 
Regards,
Matija

Message #10 received at 79311-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Matija Obid <matija.obid <at> posteo.net>
Cc: 79311-done <at> debbugs.gnu.org
Subject: Re: bug#79311: 31.0.50;
 Some characters not displayed when using standard-display-table
Date: Mon, 25 Aug 2025 22:29:54 +0300

> 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.

Message #13 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andy Moreton <andrewjmoreton <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#79311: 31.0.50;
 Some characters not displayed when using standard-display-table
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.

    AndyM

Message #16 received at 79311 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Andy Moreton <andrewjmoreton <at> gmail.com>
Cc: 79311 <at> debbugs.gnu.org
Subject: Re: bug#79311: 31.0.50;
 Some characters not displayed when using standard-display-table
Date: Tue, 26 Aug 2025 05:30:24 +0300

> 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.

Message #19 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andy Moreton <andrewjmoreton <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#79311: 31.0.50;
 Some characters not displayed when using standard-display-table
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.

    AndyM

Message #22 received at 79311 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Andy Moreton <andrewjmoreton <at> gmail.com>
Cc: 79311 <at> debbugs.gnu.org
Subject: Re: bug#79311: 31.0.50;
 Some characters not displayed when using standard-display-table
Date: Tue, 26 Aug 2025 16:30:10 +0300

> 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.

Message #25 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andy Moreton <andrewjmoreton <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#79311: 31.0.50;
 Some characters not displayed when using standard-display-table
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.

    AndyM

Message #28 received at 79311 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Andy Moreton <andrewjmoreton <at> gmail.com>
Cc: 79311 <at> debbugs.gnu.org
Subject: Re: 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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