[Bug 59610] New: X11 pointer grab breaks on XWayland after closing a dropdown in a dialog over a fullscreen window

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59610

            Bug ID: 59610
           Summary: X11 pointer grab breaks on XWayland after closing a
                    dropdown in a dialog over a fullscreen window
           Product: Wine
           Version: 11.5
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

ystem: Kubuntu 25.04, KDE Plasma 6 (Wayland), KWin 6.4.5, Wine 11.5 devel.

Symptoms: When running a Windows application in fullscreen mode under XWayland,
opening and closing a combobox (dropdown list) inside a modal dialog causes all
subsequent mouse clicks in that dialog to be ignored. Keyboard navigation
(Tab/Space) still works. The issue does NOT happen in windowed mode.

Steps to reproduce (using FastStone Image Viewer as an example):

    Open an image in FSViewer and press 'F' to enter Fullscreen.
    Press Ctrl+R to open the "Resize" dialog.
    Click on any combobox (e.g., the "Filter" dropdown) to open the list, then
click to close it or select an item.
    Try to click the "OK", "Cancel" or any other button with the mouse.
    Clicks are completely ignored.

Investigation & Workaround: The issue is caused by a conflict between Wine's
XGrabPointer (used for fullscreen ClipCursor) and XWayland/KWin surface
restacking when the override_redirect window of the combobox is destroyed. The
grab is not properly restored/respected by the compositor, and ButtonPress
events are lost.

Setting the following registry keys completely fixes the issue:
HKCU\Software\Wine\X11 Driver\GrabFullscreen = "N"
HKCU\Software\Wine\X11 Driver\GrabPointer = "N"

Suggested fix: Wine should probably avoid strict XGrabPointer for non-gaming
fullscreen applications under XWayland, or detect XWayland and rely on Wayland
pointer constraints instead, as X11 grab emulation in Wayland compositors is
prone to state desyncs during popup creation/destruction.

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[Bug 59610] X11 pointer grab breaks on XWayland after closing a dropdown in a dialog over a fullscreen window

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59610

Rémi Bernon <[e-mail]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTOURBUG
                 CC|                            |[e-mail]
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Rémi Bernon <[e-mail]> ---
Wine cannot use Wayland pointer constraints and can only use XGrabPointer. If
XGrabPointer does not behave correctly under XWayland, that's an XWayland bug
that needs to be fixed there.

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