[PATCH 0/1] MR4668: winewayland.drv: Avoid deadlock when determining whether a window is managed.

[Alexandros Frantzis (＠afrantzis)]

The is_window_managed function may acquire the (non-recursive) win_data lock
internally (is_window_managed->has_owned_popups->is_managed), so do not call
it with the win_data lock held.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55995

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Note: WineX11 also calls `is_window_managed` with win_data locked, but its win_data mutex is recursive. I haven't found a compelling reason to use a recursive win_data mutex in the Wayland driver yet, hence this fix.

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A simple way to reproduce the deadlock is:
1. Run winecfg
2. Go to the "Desktop Integration" tab
3. Click on OK