https://bugs.kde.org/show_bug.cgi?id=414522
Bug ID: 414522
Summary: Maximized windows miss drawing last right pixel
Product: kwin
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: decorations
Assignee: kwin-bugs-n...@kde.org
Reporter: meve...@gmail.com
Target Milestone: ---
Created attachment 124123
--> https://bugs.kde.org/attachment.cgi?id=124123&action=edit
Bottom right concerned dolphin and plasmashell
SUMMARY
When you maximize a window (either with shortcut or snap-top or button(s)
maximized), a vertical line can be seen on the right edge of the window that
corresponds to whatever is drawn behind this window or just before. Very often
it is the wallpaper.
It does not concern "snap-right" windows, windows positioned so that they span
the right half of the screen.
It seems to concern only KDE/Qt apps (vlc, kate, dolphin qt-creator) but not
GTK (firefox is not concerned).
Plasmashell is affected too.
It is x11 only AFAIK.
I am not sure if it is KWin, decoration or even Qt that is concerned.
I have been digging into the code and adding debug message to try diagnose it
without success.
It may be due to my hardware and settings :
Screen resolution : 3840*2160
Scale factor: 2
graphic driver: i915
STEPS TO REPRODUCE
1. In x11, maximize a Qt/KDE App
OBSERVED RESULT
A vertical line is drawn that is not part of the application (see attachement).
EXPECTED RESULT
No vertical line artifact on Qt maximized windows.
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 19.10
KDE Plasma Version: 5.17.80
KDE Frameworks Version: 5.65.0
Qt Version: 5.12.4
Kernel Version: 5.3.0-23-generic
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