https://bugs.kde.org/show_bug.cgi?id=435717
Bug ID: 435717
Summary: Can't manually resize X11 Qt5 window with
WA_PaintOnScreen attribute set
Product: kwin
Version: 5.21.4
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-x11-standalone
Assignee: kwin-bugs-n...@kde.org
Reporter: nullg...@gmail.com
Target Milestone: ---
SUMMARY
When using the WA_PaintOnScreen attribute on a QMainWindow with Qt5, it is
impossible to interactively resize the window under X11+Kwin. This does not
happen with other window managers I tested (mutter, i3's, xfce's).
STEPS TO REPRODUCE
1. Create a QMainWindow with the WA_PaintOnScreen attribute set
2. Try to manually resize the window under X11+Kwin
A test repo is available here:
https://github.com/nullgemm/QmlX11Composition.git
Here is the line setting the attribute:
https://github.com/nullgemm/QmlX11Composition/blob/master/RenderWindow.cpp#L64
OBSERVED RESULT
The window does not resize.
EXPECTED RESULT
The window resizes.
SOFTWARE/OS VERSIONS
Linux Kernel Version: 5.11.12
Plasma Version: 5.21.4
Plasma Framework Version: 5.80.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
The versions information above is that of my main setup but this issue could be
reproduced on 2 other ones.
Snapping the window on the side of the screen does resize it as expected.
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