toplevel-manager: Use app-id from parent toplevels
We currently don't look a toplevel's parents when determining the app-id, we should do that for better icon support. wlr-toplevel-management supports this since v3.
Prompted by #958 (closed)
We currently don't look a toplevel's parents when determining the app-id, we should do that for better icon support. wlr-toplevel-management supports this since v3.
Prompted by #958 (closed)