gnome-shell: stray configure notify event

[Gatis]

https://gitlab.gnome.org/GNOME/mutter/issues/400

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When unmapping X11 client, Gnome sends a stray configure notify event, where 'y' has been moved up by the height of the window decoration. Originally reported here: https://bugreports.qt.io/browse/QTBUG-71671

From xtrace output I see that gnome re-parents the window to the root window and mistakenly adjusts 'y' coordinate. There are no plausible reasons why WM should change window's coordinates when unmapping.

000:>:01c6: Event (generated) ConfigureNotify(22) event=0x02a00005 window=0x02a00005 above-sibling=None(0x00000000) x=600 y=526 width=200 height=200 border-width=0 override-redirect=false(0x00)
000:>:01c6: Event ReparentNotify(21) event=0x02a00005 window=0x02a00005 parent=0x0000011b x=600 y=526 override-redirect=false(0x00)

Where:

root window id = 0x0000011b
0x02a00005 = window which coordinates before calling unmap are x=600, y=600

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.2-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed Nov 21 15:33:14 2018
DisplayManager: gdm3
ExecutablePath: /usr/bin/gnome-shell
GsettingsChanges:
 b'org.gnome.shell' b'enabled-extensions' b"['<email address hidden>']"
 b'org.gnome.shell' b'favorite-apps' redacted by apport
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
InstallationDate: Installed on 2018-08-16 (97 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Can you please report the issue to the developers here:

  https://gitlab.gnome.org/GNOME/mutter/issues

and then tell us the new bug ID?

[Gatis (gatis.paeglis)]

https://gitlab.gnome.org/GNOME/mutter/issues/400

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mikko (mikser)]

The same bug has also been for at least 2 years present in the Linux Mint Cinnamon, which is based on Gnome.

More information:
https://bugreports.qt.io/browse/QTBUG-75312
https://bugreports.qt.io/browse/QTBUG-71671
https://github.com/linuxmint/cinnamon/issues/8546

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.

Ubuntu 18.04 (bionic) reached end-of-standard-support on May 31, 2023.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it anymore. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.