Bug#1034681: unblock: mutter/43.4-2

[Simon McVittie]

Package: release.debian.org
Severity: normal
User: release.debian.org at packages.debian.org
Usertags: unblock
X-Debbugs-Cc: mutter at packages.debian.org
Control: affects -1 + src:mutter

Please unblock package mutter

[ Reason ]
Targeted fixes from upstream for several crashes

[ Impact ]
If not unblocked, our default desktop will have various easily fixable
crashes, one of which has been reported as RC (#1033484).

[ Tests ]
I tested #1033484 manually: there is a reliable
reproducer for what appears to be the same issue in
https://gitlab.gnome.org/GNOME/mutter/-/issues/2563#note_1723575, and it
crashed my gnome-shell with libmutter 43.4-1, but no longer does with
libmutter 43.4-2.

Upstream added an automated test (build-time test + autopkgtest) for
the crash fixed by mutter!2969, which passes.

The crash with experimental's glib2.0 (gnome-shell#6552, fixed by
mutter!2955) does not have explicit test coverage, but it seemed better
to have it than not.

[ Risks ]
The fixes are narrowly-targeted and the majority of the diffstat is unit
test coverage.

[ 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 testing

unblock mutter/43.4-2
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