Comment 0 for bug 2003176

[General information about the SRU]
* It includes the fix for the bug https://gitlab.gnome.org/GNOME/metacity/-/issues/31
* The fix is already included in 3.46.0 version: https://gitlab.gnome.org/GNOME/metacity/-/commit/77f1d55479bfef479f76011a1ee5636f9bf6b08b#9f621eb5fd3bcb2fa5c7bd228c9b1ad42edc46c8
* Focal(3.36.1) and Jammy (3.44.0) needs the fix to be backported

[Impact]
This affects users using applications that have docked windows

[Test Case]

* Install gnome-session-flashback (metacity) and reproducer's dependencies `sudo apt install lightdm gnome-session-flashback pyside2-tools python3-pyside2.qtwidgets`
* Start a graphical session with metacity
* run python3 Untitled.py
* Undock one of the application's child windows
* Minimize main window
* Result: Metacity will crash
* Expectation: it should not crash and the application should be minimized.

[Regression Potential]
The fix is small in size and localized, it should not cause any regressions.

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Bug Version: 1:3.36.1-1 / 1:3.44.0-1

Metacity is running without the composite manager.

Users cannot minimize an application with an undocked child window

ProblemType: Bug
DistroRelease: Ubuntu 20.04 / Ubuntu 22.04
Package: metacity 1:3.36.1-1 / 1:3.44.0-1
ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
Uname: Linux 4.4.0-24-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64