bec8a5860a
Flip the switch in using MetaWindowDrag, leaving display grab ops and a bunch other code unused. Some places checked the grab op and/or window in complex ways, others just checked for grab existence and should now look for clutter ones, and others already were already doing this in addition. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2683>