This bug was fixed in the package gtk4 - 4.10.3+ds-1ubuntu2
---------------
gtk4 (4.10.3+ds-1ubuntu2) mantic; urgency=medium
* Cherry-pick patch to fix black rectangles seen with mutter 44.1
(LP: #2020674)
-- Jeremy Bícha <[email protected]> Wed, 24 May 2023 16:32:14 -0400
** Changed in: gtk4 (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2020674
Title:
Artifacts at window borders with mutter 44.1
Status in GTK+:
Fix Released
Status in gtk4 package in Ubuntu:
Fix Released
Status in gtk4 source package in Lunar:
In Progress
Bug description:
Impact
------
Mutter 44.1 switched from using the GL renderer to using Cairo to avoid
rendering artifacts with the Nvidia drivers. However, this also needed a change
in GTK4 to avoid other artifacts.
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2976
https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/5857
Test Case
---------
Install gnome-shell 44.1 (currently in lunar-proposed).
Install this gtk4 update.
After installing the updates, log out and log back in.
Open a terminal and the Chromium web browser.
Tile the terminal to the left and tile Chromium to the right.
Verify that there aren't rectangle rendering artifacts near the border
between the two apps.
What Could Go Wrong
-------------------
This is a one-line patch, cherry-picked from the gtk-4-10 branch that will be
included in GTK 4.10.4 (which is expected to be released any day now). This
puts us just a bit ahead of some other distros.
See the master bug LP: #2020708 for more details about what it means
to update GTK4.
Excerpt from Original Report
----------------------------
I wanted to report that I'm now seeing artifacts around window borders, when
they are arranged to occupy all available area. I should note I'm also using
gnome-shell-extension-ubuntu-tiling-assistant 39-3ubuntu2.
I'm attaching a screen recording of what I'm seeing.
The artifact at the border also happens across monitors. The tall
chrome window on the right of the left monitor interferes with the
windows aligned to the left of the right monitor.
This happened immediately after updating mutter and gnome shell to
44.1, it wasn't happening before.
So far I'm seeing them with just google-chrome and chromium (snap),
but not other apps I quickly tried (gnome-terminal, firefox).
ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: libmutter-12-0 44.1-0ubuntu1
ProcVersionSignature: Ubuntu 6.2.0-20.20-generic 6.2.6
Uname: Linux 6.2.0-20-generic x86_64
ApportVersion: 2.26.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Wed May 24 10:17:44 2023
SourcePackage: mutter
UpgradeStatus: No upgrade log present (probably fresh install)
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