Bug#1110213: gnubg: flickering issues when using GUI

[Francesco Ariis <fa-ml@ariis.it>]

Package: gnubg
Version: 1.08.003-3
Severity: important
X-Debbugs-Cc: fa-ml@ariis.it

Dear Maintainer,

    gnubg flickers on debian trixie.

To reproduce:

1. upgrade to trixie
2. launch `gnubg` (we are in graphical, 2d mode)
3. start a game, move some chequers, click on the UI buttons
4. you will notice various element flickering

I tried toggling various graphics option, but no dice.

My expectation: none of the UI element to flicker.


-- System Information:
Debian Release: 13.0
  APT prefers testing-security
  APT policy: (500, 'testing-security'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.12.38+deb13-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gnubg depends on:
ii  debconf [debconf-2.0]   1.5.91
ii  gnubg-data              1.08.003-3
ii  libc6                   2.41-11
ii  libcairo2               1.18.4-1+b1
ii  libcanberra-gtk3-0      0.30-18
ii  libcanberra0            0.30-18
ii  libcurl4t64             8.14.1-2
ii  libepoxy0               1.5.10-2
ii  libfreetype6            2.13.3+dfsg-1
ii  libgdk-pixbuf-2.0-0     2.42.12+dfsg-4
ii  libgl1                  1.7.0-1+b2
ii  libglib2.0-0t64         2.84.3-1
ii  libglu1-mesa [libglu1]  9.0.2-1.1+b3
ii  libgmp10                2:6.3.0+dfsg-3
ii  libgtk-3-0t64           3.24.49-3
ii  libpango-1.0-0          1.56.3-1
ii  libpangocairo-1.0-0     1.56.3-1
ii  libpng16-16t64          1.6.48-1
ii  libpython3.13           3.13.5-2
ii  libreadline8t64         8.2-6
ii  libsqlite3-0            3.46.1-7

gnubg recommends no packages.

Versions of packages gnubg suggests:
ii  sensible-utils  0.0.25

-- debconf information:
  gnubg/build-bearoffs: true