9c5bd9f847
Users of Clutter grabs may listen for notify::revoked changes in order to know that their grab is no longer in charge of event propagation, without the use of crossing events. Since a ClutterGrab may stay in the stack and regain effects, this notification also happens the other way around. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3420>