GNU bug report logs - #76210
31.0.50; menu-bar-mode unexpectedly shrinks frame substantially

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From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>, Markus Triska <triska <at> metalevel.at>
Cc: 76210 <at> debbugs.gnu.org
Subject: bug#76210: 31.0.50; menu-bar-mode unexpectedly shrinks frame substantially
Date: Wed, 12 Feb 2025 11:02:59 +0100

>> To reproduce this issue, please invoke Emacs with:
>>
>>      $ emacs -Q --eval "(while t (menu-bar-mode (if menu-bar-mode 0 1)) (redisplay))"
>>
>> Within a few seconds of running this, I unexpectedly see the frame
>> getting smaller and smaller.
>>
>> With earlier Emacs versions, the frame unexpectedly becomes
>> substantially larger within a few minutes of running it.
>
> I cannot reproduce this on MS-Windows.
>
> Martin, any comments, thoughts, or suggestions?

I cannot reproduce it here with

In GNU Emacs 31.0.50 (build 2, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.16.0, Xaw3d scroll bars) of 2025-02-12 built on restno
Repository revision: 55ffbeaab1da66abee8a84f79c2cebd2c61f336f
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux 12 (bookworm)

Configured using:
 'configure --with-gif=ifavailable --with-tiff=ifavailable
 --with-gnutls=no --without-pop --enable-gcc-warnings=warn-only
 --with-x-toolkit=lucid --enable-checking=yes
 --enable-check-lisp-object-type=yes 'CFLAGS=-O0 -g3 -no-pie
 -Wno-missing-braces''

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GSETTINGS HARFBUZZ JPEG LIBSELINUX MODULES
NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS WEBP X11 XAW3D XDBE XIM XINERAMA XINPUT2 XPM XRANDR
LUCID ZLIB

The frame keeps shrinking and expanding by one line as expected.

What happens when you evaluate

(setopt frame-inhibit-implied-resize '(tab-bar-lines menu-bar-lines))

before triggering that loop?  If you want to run it from the command line,
use

 --eval "(progn (setopt frame-inhibit-implied-resize '(tab-bar-lines menu-bar-lines)) (while t (menu-bar-mode (if menu-bar-mode 0 1)) (redisplay)))"

Thanks, martin

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