embed: Use a global filter for events
embed: Use a global filter for events

Instead of using a per-window filter. Clutter will still do the matching
with the stage window internally, and GDK won't deliver some events (like
XI2 ones) to the per-window filter by default.

Distrotech/clutter-gtk,GNOME/clutter-gtk,Distrotech/clutter-gtk,Distrotech/clutter-gtk,GNOME/clutter-gtk