[kwin] [Bug 524308] New: XWayland app windows and drop down menus positioned incorrectly with vertically offset, side by side monitors

https://bugs.kde.org/show_bug.cgi?id=524308

            Bug ID: 524308
           Summary: XWayland app windows and drop down menus positioned
                    incorrectly with vertically offset, side by side
                    monitors
    Classification: Plasma
           Product: kwin
      Version First 6.7.4
       Reported In:
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: xwayland
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Created attachment 195178
  --> https://bugs.kde.org/attachment.cgi?id=195178&action=edit
Screen Arrangement

DESCRIPTION
XWayland apps (Steam and KiCad in my case) position their windows on launch to
be in line with the top of secondary monitor. I.e. they open half way down my
primary monitor. On KiCad: even after resizing window, drop down menus align
with the top of secondary monitor instead of top of primary monitor.

STEPS TO REPRODUCE
1. Have two monitors, with secondary monitor to the left of primary monitor,
and offset downwards by ~500px (top of secondary monitor slightly below top of
primary monitor, see attachment).

2. In Window Behaviour, set Window placement to "Centred" (Default)

3. Open any XWayland app (Steam or KiCad in my case).

4. (only on KiCad so far) Open any drop down menus after fullscreening window.

OBSERVED RESULT
Application windows open centred on the y value of the centre of secondary
monitor.

EXPECTED RESULT
Application windows open centred on the y value of the centre of primary
monitor.

SOFTWARE/OS VERSIONS
Operating System (available in the Info Center app, or by running `kinfo` in a
terminal window): Fedora Linux 44
KDE Plasma Version: 6.7.4
KDE Frameworks Version: 6.29.0
Qt Version: 6.11.1

ADDITIONAL INFORMATION

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