Bug#1031926: bullseye-pu: package gtk+3.0/3.24.24-4+deb11u3

[Simon McVittie]

Package: release.debian.org
Severity: normal
Tags: bullseye
User: release.debian.org at packages.debian.org
Usertags: pu
X-Debbugs-Cc: gtk+3.0 at packages.debian.org, Dominique Martinet <dominique.martinet at atmark-techno.com>
Control: affects -1 + src:gtk+3.0

[ Reason ]
User request via #1020937: make it possible to run GTK 3 apps in native
Wayland on some proprietary GLES-only graphics drivers (Raspberry Pi
video core, iMX/Vivante).

[ Impact ]
If not accepted, GTK 3 apps on the affected hardware/driver combination
can only be run if forced to use X11.

[ Tests ]
The proposed change has been in testing and unstable since November
as part of version 3.24.34-4. The version proposed for bullseye is a
straightforward cherry-pick.

For the affected GLES-only graphics drivers, the user requesting the
change has confirmed that a functionally equivalent prerelease package
has the desired effect.

For ordinary "desktop GL" drivers, I used the same prerelease package on
a bullseye/NVIDIA system (with NVIDIA proprietary drivers) for several
weeks without incident, and my partner's bullseye/Intel/Mesa system now
has the proposed package, again without obvious regressions.

[ Risks ]
It's a minimal change, cherry-picked from newer GTK 3 without
modification. The affected code runs whenever GL is initialized for a
window, which should mean that any regressions would be very obvious,
since many (all?) GTK 3 apps use GL.

The version of this change in GTK 4 is much more intrusive and did not
seem suitable for backporting.

[ Checklist ]
  [x] *all* changes are documented in the d/changelog
  [x] I reviewed all changes and I approve them
  [x] attach debdiff against the package in (old)stable
  [x] the issue is verified as fixed in unstable

[ Changes ]
All changes are part of solving #1020937.
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