https://bugs.kde.org/show_bug.cgi?id=452240
Bug ID: 452240
Summary: wayland: "No titlebar and frame" rule doesn't force
SSDs
Product: kwin
Version: 5.24.4
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: rules
Assignee: kwin-bugs-n...@kde.org
Reporter: k...@subraizada.com
CC: isma...@gmail.com
Target Milestone: ---
SUMMARY
I use the "No titlebar and frame": Force to "No" window rule to have KWin force
server side decorations on some applications which use CSD by default.
My rules were working in X11 - KWin would draw the titlebar above the
application's CSD and would draw the Breeze theme's window shadows around the
edges of the application. But the rules no longer work in Wayland.
I've tested that the "Keep above other windows" rule is still applying properly
to these applications in Wayland, so there's no issue with window matching.
I can apply the rule in the opposite direction to remove SSDs on normal Qt/GTK
applications like Konsole, Dolphin, Qalculate. That works fine in all
scenarios. So force-removing SSDs works, but force-adding them doesn't.
STEPS TO REPRODUCE
1. For an application which uses CSD, add a rule which has "No titlebar and
frame" set to "Force: No"
2. Run the application under an X11 session or in XWayland: the rule works. Run
the application under native Wayland: the rule has no effect.
OBSERVED RESULT
When the application is running under native Wayland, the application does not
have SSD applied by KWin. SSDs are drawn in X11 or when using XWayland.
EXPECTED RESULT
The application has server side decorations applied by KWin even in native
Wayland.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3
ADDITIONAL INFORMATION
I tested this with Gnome's Simple-Scan (any other CSD-using Gnome application
should also reproduce) and also with some Electron applications.
Electron applications will run under XWayland by default, so this needs to be
added to the Exec line in their .desktop files to have them use native Wayland:
" --enable-features=UseOzonePlatform --ozone-platform=wayland".
Possibly related: https://bugs.kde.org/show_bug.cgi?id=429171
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