Gets information about which window the given pointer device is in, based on events
that have been received so far from the display server. If another application
has a pointer grab, or this application has a grab with owner_events = %FALSE,
%NULL may be returned even if the pointer is physically over one of this
application's windows.
Gets information about which window the given pointer device is in, based on events that have been received so far from the display server. If another application has a pointer grab, or this application has a grab with owner_events = %FALSE, %NULL may be returned even if the pointer is physically over one of this application's windows.