Placing GTK+ widgets above a GtkChamplainEmber is broken on Wayland
Submitted by Marcus Lundblad
In Maps we place the map view (a GtkChamplainEmbed) into a GtkOverlay to be able to show app notifications "revealing down" from the header bar. However under Wayland these do not show up. According to Mutter developers this is some issue with Clutter surfaces in some way. I guess in the long-term moving libchamplain away from Clutter might be needed, since Clutter will not work with GTK+ 4 AFAIK (and yeah, I realize this a huge task).