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[Launchpad Bug Tracker <2040453@xxxxxxxxxxxxxxxxxx>]

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[ Impact ]

Since the upgrade to Ubuntu 23.10 with Gnome45, it is no longer possible
to restart gnome-shell without crashing the session. The only way not to
crash it is to close all applications before restarting gnome-shell.

This has already been fixed upstream at
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3329

[ Test Plan ]

1. Log-in to a Ubuntu Xorg session
2. Open some application windows
3. Press Alt+F2
4. Type 'restart' and press Enter
5. Verify that the desktop reloaded correctly.
6. Verify that the application windows that were previously open remained open.

[ Where problems could occur ]

The change should only affect application windows that were open before
gnome-shell take over as the x11 compositor, which is not the common
use-case.

There is a general regression potential in the handling of x11 windows, that is all apps in a GNOME Xorg session, or legacy apps that use XWayland (such as VLC, Mattermost, or most Electron and Java apps) in a GNOME Wayland session.
Watch out for the correct behaviour when opening/closing application windows.

** Affects: gnome-shell
     Importance: Unknown
         Status: Fix Released

** Affects: mutter
     Importance: Unknown
         Status: Fix Released

** Affects: mutter (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: mutter (Ubuntu Noble)
     Importance: Medium
     Assignee: Alessandro Astone (aleasto)
         Status: Fix Released

** Affects: ubuntu-translations
     Importance: Undecided
         Status: New


** Tags: fixed-in-mutter-46.4 fixed-upstream mantic udeng-5206 verification-done verification-done-noble
-- 
Gnome 45 crash on restart in X11 session [Window manager error: Another compositing manager is already running on screen 0 on display “:0”]
https://bugs.launchpad.net/bugs/2040453
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