This bug was fixed in the package gtk+3.0 - 3.24.20-0ubuntu1.1
---------------
gtk+3.0 (3.24.20-0ubuntu1.1) focal; urgency=medium
* debian/patches/git_rendering_issues.patch:
- cherry pick an upstream fix for opengl display issues when using
software rendering (lp: #1960947)
* debian/patches/git_newglib_symbols.patch:
- backport patch to fix the build with the current libglib version
-- Sebastien Bacher <seb...@debian.org> Tue, 15 Feb 2022 18:50:52
+0100
** Changed in: gtk+3.0 (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1960947
Title:
Graphical issues for GtKGL in software rendering
Status in gtk+3.0 package in Ubuntu:
Fix Released
Status in gtk+3.0 source package in Focal:
Fix Released
Bug description:
* Issue
GTK applications using GL graphic show corruption problems under
software rendering
* Test case
1. install gtk-3-examples
2. $ LIBGL_ALWAYS_SOFTWARE=1 gtk3-demo
3. select the gl example, it should render without issues
* Regression potentiel
The change is in the GL backend so check for rendering issues in GTK
softwares using GL, including flutter applications
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