Bug#1122372: trixie-pu: package mutter/48.7-0+deb13u1

[Simon McVittie]

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

[ Reason ]
Catch up with upstream bugfix releases

[ Impact ]
If not accepted, various bug fixes that happened upstream since Debian 
13.0 will not be available to users of stable, for example #1121170 (a 
crash after long screencast sessions).

[ Tests ]
A functionally-equivalent test-build is available from 
<https://people.debian.org/~smcv/temp/2025/13.3/>. The only differences 
between that and the proposed version are in debian/changelog. I have 
been using this version on a GNOME desktop for a while, and recently 
upgraded my work computer and my partner's daily-use laptop to match.

I asked for wider testing in 
<https://lists.debian.org/debian-gtk-gnome/2025/11/msg00015.html> and 
have not had any regression reports. (I haven't had any positive test 
results either, though.)

I have not attempted to reproduce specific bugs.

There is unit test coverage, but it is unfortunately rather flaky (this 
is an ongoing issue also affecting testing/unstable) and might need some 
retries to get the proposed version through buildds and autopkgtest. In 
this version I've left unit test failures as fatal rather than ignoring 
them, for visibility.

48.5 was in unstable until it was superseded by 49.x. 48.6 and 48.7 were 
never in unstable.

[ Risks ]
A Wayland compositor is not a simple codebase, so regressions are 
possible. Upstream is generally good about solving regressions in their 
next stable release (48.8 is due on around 2026-01-03, which is slightly 
too late for our planned 13.3 point release on 2026-01-10).

[ 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 described in the changelog. All changes came from 
upstream, except for an update to d/libmutter-test-16.symbols to account 
for new unit-test-only ABI, and routine updates to d/gbp/conf and 
d/control to switch to the debian/trixie branch.

The attached debdiff was lightly filtered to exclude translations.

[ Other info ]
This version has only been tested together with the corresponding 
gnome-shell update. I'm not aware of any explicit dependencies, but I 
suggest accepting or deferring both, as a batch.

I have not yet uploaded this or the corresponding gnome-shell update to 
proposed-updates, to avoid making it hard to do smaller updates if this 
new-upstream-version update is rejected; but if the release team is 
inclined to accept the new upstream versions, then I think it would be a 
good idea to get them into proposed-updates soon so that they can have 
wider testing. Please let me know if/when I can upload.
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