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Xwayland was sending incorrect pointer coordinates to X clients on
pointer enter events.
This was caused by calling CheckMotion() with a NULL event, which
prevented the pointer sprite hot coordinates from being updated
properly.
Fix this by constructing a proper DeviceEvent of type ET_Enter in
pointer_handle_enter, initializing it with the current timestamp
and EVENT_SOURCE_FOCUS, and passing it to CheckMotion() instead
of NULL.
This ensures the pointer sprite coordinates are correctly updated
when the pointer enters a window.
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2113>
(cherry picked from commit 7fb5e00ad8)