4daea0ccae
909616b208
seems to have wrapped window actors in a container, so the actor.has_pointer check started failing. Instead, switch to meta_window_has_pointer () which doesn't rely on window actor implementation details.
We check for existence of has_pointer first just in case someone attempts to run gnome-shell 44.1 with mutter 44.0 which does not have the function exported publicly yet.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2710>