https://bugs.kde.org/show_bug.cgi?id=511612
Bug ID: 511612
Summary: Wrong window borders if application is not constantly
rendering
Classification: Plasma
Product: kwin
Version First 6.5.1
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: decorations
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 186482
--> https://bugs.kde.org/attachment.cgi?id=186482&action=edit
Illustration of the issue
SUMMARY
The window decorations (server side) do not accurately represent the actual
window state. There is a one-frame lag for the window outline updates. Note
that this one-frame lag is controlled not by kwin, but by the application. The
application may not need to render the window contents, in which case the
effects of the lag are seen for extended periods of time.
STEPS TO REPRODUCE
0. It may be necessary to have the window borders visible via a color theme.
1. Build https://github.com/wolfpld/moderncore
2. Run iv
3. Switch between the iv window and any other window and observe iv window
borders.
OBSERVED RESULT
See the attached image. There are two versions of the application there, "A"
renders only when it needs to do so. "B" renders constantly.
Window "1" is when the application is doing a render loop (playing an image
loading animation) and then stops. All looks fine there.
Windows "2" and "4" show how the window border looks after switching the focus
to the window.
Windows "3" and "5" show how the window border looks after switching the focus
away from the window.
EXPECTED RESULT
Code versions "A" and "B" should behave the same.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.5.1
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.17.5-arch1-1 (64-bit)
Graphics Platform: Wayland
ADDITIONAL INFORMATION
The difference between the "A" and "B" code versions is in Viewport::Render()
function, where the m_render early exit was commented out for the "B" version.
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