Fix window screenshots with pointer v2
mutter@909616b2 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.
This is an alternative / cleaner version of !2701 (closed).
Requires: mutter!2928 (merged)
Edited by Ivan Molodetskikh