[PATCH v2 0/1] MR7857: winewayland: Don't update constraints without wl_pointer.

[Attila Fidan (＠atticf)]

If ClipCursor is called while the seat doesn't have a pointer and the
call qualifies for locking the pointer, it would have tried to lock a
null wl_pointer.

For example, I'm launching a fullscreen application (which causes ClipCursor calls on startup) in a headless compositor before I launch my virtual keyboard/pointer client. While the pointer is deinitialized and there cannot be a focused hwnd, the cursor wl_surface will not be set, making it qualify for pointer locking.

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  v2: winewayland: Require wl_pointer for pointer constraints.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/7857