[Bug 59334] New: Pop-up menu opened behind the parent window in Steam when using XWayland in full-screen mode

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59334

            Bug ID: 59334
           Summary: Pop-up menu opened behind the parent window in Steam
                    when using XWayland in full-screen mode
           Product: Wine
           Version: 11.1
          Hardware: x86-64
               URL: https://cdn.fastly.steamstatic.com/client/installer/St
                    eamSetup.exe
                OS: Linux
            Status: NEW
          Keywords: download
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ArchLinux

Created attachment 80272
  --> http://bugs.winehq.org/attachment.cgi?id=80272
plain terminal output

In the Steam client, when you right-click a game in your library, a context
menu opens that allows you to perform several functions, such as uninstalling,
performing a validity check, or viewing properties. This context menu opens
behind the main Steam window; therefore, it cannot be interacted with.
This happens when running Steam in XWayland and using Wine full-screen mode. In
XWayland and virtual desktop mode the menu appears correctly.
The problem doesn't occur under X Server and using full-screen (XFCE).
I also reproduced the issue in Weston 14.0.2; this rules out the possibility of
it being a bug specific to KDE Plasma or KWin as far as I know.
I can't check out the native Wayland driver because it has it's own problem:
the Steam window is empty/black using Wayland.

The same problem with Wine-9.0, 10.0 etc. Wine-Staging has this problem, too.

You can reproduce the problem even though you don't have a Steam account.
Install the Steam client, let it perform the auto-update and when the login
window appears click on <Create a free account> in the lower right corner.
There is a drop-down menu under Country of residence, when opened in
full-screen mode (XWayland), the list of countries appear behind the main Steam
window. In virtual desktop mode the list is visible properly.

wine-11.1-102-g93f3d8ae9fa
Arch Linux
KDE Plasma 6.5.5
KWin (Wayland)
Xwayland Version 24.1.9
Nvidia binary drivers 590.48.01

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