https://bugs.kde.org/show_bug.cgi?id=441005
Bug ID: 441005
Summary: kwin can't read WM_CLASS while xprop can
Product: kwin
Version: 5.18.5
Platform: Other
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: erago...@gmx.net
Target Milestone: ---
SUMMARY
kwin can't read WM_CLASS of a specific application (bitwig studio), even though
xprop can. Because of this, i have to use the window title to create an
application rule, which could potentially break.
STEPS TO REPRODUCE
1. install bitwig studio and launch the application in demo or guest mode
2. open system settings and navigate to Window Management -> Window Rules ->
New -> Detect Window Properties and click the bitwig studio window.
3. open a terminal, run xprop and click the bitwig studio window
OBSERVED RESULT
xprop correctly shows "WM_CLASS(STRING) = 'com.bitwig.BitwigStudio'", which is
exactly what is specified in the .dekstop file. kwin however returns "()" as
window class.
EXPECTED RESULT
kwin should be able to read the WM_CLASS just like xprop
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 20.04.2 LTS
(available in About System)
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8
ADDITIONAL INFORMATION
1. The Bitwig GUI is written in Java as far as i know, and the window also has
no title bar.
2. Im new to KDE and Linux in general as well as bug reporting so please excuse
me if this has been fixed. I searched for a bit but i couldn't find a similar
issue. Im on Kubuntu 20.04.2 LTS, which means that kwin is stuck in version
5.18.5. No idea if this has been fixed since.
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