https://bugs.kde.org/show_bug.cgi?id=422117
Bug ID: 422117
Summary: [Desktop Grid] maximized windows (only!) are rendered
rough even when Scale Method is set to Accurate
Product: kwin
Version: 5.18.5
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: effects-desktop-grid
Assignee: kwin-bugs-n...@kde.org
Reporter: p...@phd.re
Target Milestone: ---
Created attachment 128813
--> https://bugs.kde.org/attachment.cgi?id=128813&action=edit
desktop-grid-maximized-windows-bug.png
SUMMARY
In Desktop Grid effect maximized windows (and only maximized!) are rendered
very rough even when Compositor's Scale Method is set to Accurate.
If you resize the window a little bit down, you get beautiful smooth and
readable scaling again.
See "desktop-grid-maximized-windows-bug.png" screenshot:
Desktop 1x1: maximized Gwenview (rough!)
Desktop 1x2: maximized KWrite with some source code (rough!)
Desktop 2x1: normal window Gwenview (OK)
Desktop 2x2: normal window KWrite with the same source code (OK)
File displayed in Gwenview (attached):
https://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Parallel_lines_in_Poincare%27s_model_of_hyperbolic_geometry.svg/1280px-Parallel_lines_in_Poincare%27s_model_of_hyperbolic_geometry.svg.png
STEPS TO REPRODUCE
1. In System Settings set the Compositor's Scale Method to Accurate.
2. Enable Desktop Grid effect.
3. Open some maximized windows (one window per virtual desktop).
4. Activate Desktop Grid effect.
OBSERVED RESULT
Desktop 1x1: maximized Gwenview (rough!)
Desktop 1x2: maximized KWrite with some source code (rough!)
EXPECTED RESULT
Maximized windows in Desktop Grid should be rendered smooth and readable.
SOFTWARE/OS VERSIONS
Linux: Ubuntu 20.04
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8
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