Bug#1052227: bookworm-pu (pre-approval): mutter/43.8-0+deb12u1

[Simon McVittie]

Package: release.debian.org
Severity: normal
Tags: bookworm
User: release.debian.org at packages.debian.org
Usertags: pu
X-Debbugs-Cc: mutter at packages.debian.org, debian-gtk-gnome at lists.debian.org
Control: affects -1 + src:mutter

[ Reason ]
Several new upstream bugfix releases. I've been trying to get these into
a suitable state for a stable update since 12.1, but every time I've
been testing one long enough to think about asking for upload approval,
there have been more bugfixes upstream and the cycle starts again.

This might be the last upstream bugfix release in the 43.x series,
or we might get a 43.9.

[ Impact ]
If not accepted, various crashes and other bugs will remain unfixed,
despite having solutions known to upstream.

[ Tests ]
A prerelease build is available at
https://people.debian.org/~smcv/12.3/pool/main/m/mutter/
and is in use on my household's bookworm laptop/desktop systems, with
no obvious regressions so far.

The diff is not small and the 12.2 deadline is coming up, so I think we
should continue testing this until after 12.2 is out, and then upload. I
would appreciate any testing that the rest of the GNOME team can provide.

43.7-1 was in testing for a while before being superseded by version 44.
I also tested a bookworm backport of 43.7-1 on my household's bookworm
laptop/desktop systems for a while.

[ Risks ]
I am not any sort of expert on compositor development, but upstream
have generally been good about backporting only bug fixes to their
stable branches. There have been some regressions in the past because
this stuff is difficult. If there are regressions from these changes,
they're likely to be of the same magnitude as the bugs that were fixed.

[ 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
      (lightly filtered, see top of debdiff)
  [x] the issue is verified as fixed in unstable

[ Changes ]
clutter/clutter/clutter-paint-volume.c:
    - Improve GNOME Shell app grid performance by avoiding repainting
      monitors other than the one it is displayed on
      (partially fixes gnome-shell#6819, a full fix needs gnome-shell 43.9
      which I am also proposing as a stable update; fixed in 44.4 for
      unstable)

clutter/clutter/clutter-stage.c, src/core/window.c,
src/core/display-private.h, src/core/display.c:
      Give focus to new app windows when launched from the gnome-shell
      overview, fixing a regression in 43.3-5 and upstream 43.4
      (Closes: #1035092, #1049934; fixed in 43.7 and 44.4 for unstable)

cogl/cogl/driver/gl/cogl-gl-framebuffer-fbo.c:
    Fix a test failure with recent Mesa (Closes: #1042055, LP: #2025287;
    fixed in 44.4 for unstable)

src/backends/meta-stage-impl.c:
    - Fix flickering and rendering artifacts when using software rendering,
      for example on older Intel hardware unsupported by the Gallium i915
      driver (mutter#2602; fixed in 44.4 for unstable)

src/backends/native/meta-output-kms.c:
      Make the choice of preferred video mode consistent between code
      paths, fixing choice of video mode on some monitors (mutter!3055;
      fixed in 44.4 for unstable)

src/tests/: More test coverage, especially for #1035092
      (included in 43.7 and 44.4 for unstable)

src/wayland/meta-wayland-touch.c:
    - Fix the ability to drag libdecor windows by their title bar on
      touchscreens (mutter#2872; fixed in 44.4 for unstable)

.gitlab-ci.yml: Upstream CI changes, filtered out of the diff

[ Other info ]
I've only tested this in conjunction with an accompanying gnome-shell
update, so it would be best if the same release team member can look
at both.

The attached diff corresponds to packaging commit 225a383fa6, test-builds
are labelled as 43.8-0+deb12u1~43.7+2+22+g225a383fa6.

    smcv
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