https://bugs.kde.org/show_bug.cgi?id=492018
Bug ID: 492018
Summary: Wrong mouse position in popup menus in Java apps using
AWT/Swing
Classification: Plasma
Product: kwin
Version: git master
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: X11 Integration
Assignee: kwin-bugs-n...@kde.org
Reporter: ad.liu....@gmail.com
Target Milestone: ---
SUMMARY
kwin has a change in when `ConfigureNotify` is sent:
https://invent.kde.org/plasma/kwin/-/commit/7b486e215d44bbd9fdeb8f1180c76fb16ec6a311
The above change conforms to ICCCM, but it breaks Java apps using Swing: after
maximizing the app window, in popup menus, the app considers the mouse cursor
to be at a different position than it visually is, as if the app window is in
the position before maximizing.
We suspect this is caused by AWT special-casing `ConfigureNotify` behavior on a
WM whitelist:
https://github.com/openjdk/jdk/blob/88ccbb60919e4523064b0da17184eedcd9efa087/src/java.desktop/unix/classes/sun/awt/X11/XWindowPeer.java#L772
And `kwin` is not in the list. Making `kwin` disguise as `mutter` fixes the
problem, which confirms the theory.
Upstream bug report:
https://bugs.java.com/bugdatabase/view_bug?bug_id=JDK-8338752
STEPS TO REPRODUCE
1. Start KDE Plasma 6.2-dev.
2. Start the Java app `jdownloader2`, unmaximized.
3. Move the app window to the screen center.
4. Maximize the app window.
5. Right click to show the popup menu.
OBSERVED RESULT
Mouse is considered to be to the top-left of its actual position.
EXPECTED RESULT
Mouse works alright in the menu.
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