[PATCH v2 0/1] MR10949: winex11.drv: Return WithdrawnState when get_window_wm_state() fails.

[Zhiyi Zhang (＠zhiyi)]

KWin deletes WM_STATE property from a window when entering WithdrawnState. Please see
X11Window::exportMappingState() in the KWin source code. So when get_window_wm_state()
fails, -1 is returned before this patch. Since -1 is not a valid WM_STATE, it might cause
Wine to expect an invalid value. We also can't simply ignore the invalid -1 because we
might be expecting the WM_STATE property notify event to change to the desired state.
Treating missing WM_STATE property as WithdrawnState seems like the best way to go.

Help fix RiME(493200) sometimes fails to restore from Alt+Tab.

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  v2:  
https://gitlab.winehq.org/wine/wine/-/merge_requests/10949