Bug#1110118: Qt6/Wayland: context menus open centered on rotated+offset multi-monitor; XWayland OK

[Aurélien COUDERC <libre@coucouf.fr>]

control: reassign -1 kwin

Le 30 juillet 2025 09:24:46 GMT+02:00, Jennifer Riley <klipo89@gmail.com> a écrit :
>Package: qt6-wayland
>Version: 6.8.2-4
>Severity: normal
>X-Debbugs-Cc: klipo89@gmail.com
>
>Dear Maintainer,

Dear Jennifer,

>On Wayland, context menus in multiple Qt apps (Dolphin, Konsole) appear
>centered in the window instead of at the cursor on a rotated+offset
>multi-monitor layout. Running the same apps under XWayland
>(QT_QPA_PLATFORM=xcb) fixes it immediately.
>
>Expected:
>  Context menus open at cursor location on all monitors.
>
>Actual:
>  On one monitor (upper-right quadrant), menus open centered in the
>  app window. Moving/resizing the window often “fixes” it until next time.
>
>Monitor layout (from `kscreen-doctor -o`):
>  - HDMI-A-1: 1080x1920, rotation 90°, position 0,0 (scale 1)
>  - DP-1:     2560x1440, rotation 0°,  position 1080,342 (scale 1)
>
>Reproduce steps:
>  1) Log into Plasma Wayland with the above monitor geometry.
>  2) Open Dolphin or Konsole on DP-1.
>  3) Right-click in the upper-right quadrant of the window.
>  4) Menu appears centered instead of at cursor.

Thank for your bug report.

My first guess would be an issue in kwin.

Could you try reinstalling 6.3.5 packages from [1] and see if it fixes your issue ?

If yes if would be useful to identify if the issue is in kwin 6.3.6 or due to one of the patches I backported from 6.4.

Either you feel comfortable building Debian packages yourself and you can try disabling all patches to get an exact 6.3.6 upstream package, or I will create these packages myself for you to test.

[1] <https://snapshot.debian.org/package/kwin/4%3A6.3.5-1/>


Thanks,
--
Aurélien