Bug#1107734: unblock (pre-approval): mutter/48.3.1-2

[Simon McVittie]

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

[ Reason ]
New upstream bug fix release

[ Impact ]
If not accepted we'll be missing several known bug fixes (memory leaks,
performance fixes, behaviour fixes, etc.) and it will be harder to do
subsequent stable updates.

I'm also hoping that some of the fixes in the new upstream release will
address, or at least help, the flakiness of mutter's test suite and
autopkgtests (#1093969) - but that's difficult to determine because it's
always been a probabilistic thing, with the failures being most frequent
on slower architectures that don't run autopkgtests on experimental
packages.

[ Tests ]
A functionally equivalent package has been in experimental for a while.
I've been running that on my GNOME laptop since it was uploaded without
observing any problems.

There is also autopkgtest coverage, which passed so far.

[ Risks ]
High-visibility key package, a core part of our default desktop
environment.

This is from an upstream maintenance branch, and they have a schedule
for maintenance branch updates (the next one will be in early August).
In my experience this upstream has generally been good at avoiding
regressions. All changes are targeted and can be reverted if necessary.

There is one known bug related to the changes, mutter#4033 upstream:
the proposed version improves tracking of drag-and-drop cursors in some
situaions (ensuring that the cursor changes between pointer, drag hand,
or "cannot drop" when appropriate), but this is known not to work for
older versions of GTK (most commonly from Flatpak or Snap apps that use
an outdated runtime). A fix has been proposed upstream, but not yet
reviewed or merged. If I'm reading correctly, 48.1 in trixie already
has this bug, so it is not a regression in the proposed version.

[ 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
      - debdiff is testing vs. experimental, what I'm proposing is
        the same plus a changelog update. I've excluded the changelog
        from the debdiff and pasted a draft changelog below.

--------

mutter (48.3.1-2) UNRELEASED; urgency=medium

  * Add a detailed list of changes to the previous changelog entry

 -- Simon McVittie <smcv at debian.org>  Sun, 08 Jun 2025 17:55:09 +0100

mutter (48.3.1-1) experimental; urgency=medium

  * New upstream bugfix release
    - Improve performance of use-cases like fullscreen video playback
      on older GPUs such as the one in the Pinebook Pro, by substituting
      opaque dmabuf formats for their equivalents with alpha, such as
      XRGB for ARGB (mutter#2471 upstream)
    - Allocate the correct height for members of a vertical layout by
      updating size request mode when changing orientation
      (mutter!4339 upstream)
    - Only check for xkbfile when supporting X11
      (no practical effect on Debian, where we do support X11)
      (mutter!4409 upstream)
    - Fix several memory leaks, while ensuring objects are still destroyed
      in the correct order
      (mutter!4432 upstream)
    - Don't log a warning when files are removed from the ICC profile
      directory, fixing one source of flaky automated tests
      (mutter!4431 upstream)
    - Don't take control of logind session when running on Xorg, fixing the
      tty being left in an inconsistent state if mutter is killed
      (mutter!4391 upstream)
    - Fix gdctl crash when communicating with Xorg sessions
      (mutter#4023 upstream)
    - Avoid unexpectedly low framerate when moving/resizing windows after
      session locking or after heavy system load
      (mutter#4029 upstream)
    - Fix drag and drop of tabs into tiled/maximized state
      (mutter!4468 upstream)
    - Fix Xwayland windows becoming unresponsive to events
      (mutter!4475 upstream)
    - Use frame-sync candidate that likely matches scanout candidate, making
      variable refresh rate work better
      (mutter!4412 upstream)
    - Add an early-return from build_and_scan_frame_mask() for zero-sized
      textures, possibly fixing one source of flaky automated tests
      (mutter!4039 upstream)
    - Avoid leaking the session manager file's file descriptor down to
      apps launched by gnome-shell
      (gnome-shell#8345, mutter!4405 upstream)
    - Restore tiled/maximized windows to the correct monitor
      (mutter#3939 upstream)
    - Let the compositor control drag-and-drop cursor feedback for native
      Wayland
      (mutter!4390 upstream)
      - Related issue mutter#4033 upstream, mainly affecting older GTK
        versions like those in outdated Flatpak and Snap runtimes, is not
        fixed here; see mutter!4433 upstream for a possible solution
    - Propagate all touchpad gesture events to apps
      (mutter#3505 upstream)
    - Fix a race condition when registering an implict grab
      (mutter#4055 upstream)
    - Fix Wine games failing to enter fullscreen across multiple monitors
      (mutter!4389 upstream)
    - Update window decorations on override-redirect attribute change
      (mutter!4287 upstream)
    - In the test suite, fall back to a reasonable pipewire socket name on
      non-systemd systems
      (mutter#4044 upstream)
    - Translation updates: be, sk

 -- Jeremy Bícha <jbicha at ubuntu.com>  Fri, 06 Jun 2025 13:51:45 -0400
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