MetaBackend owns MetaScreenCast which owns MetaScreenCastSession which owns MetaScreenCastStream. Make it possible to fetch objects in the oppositev direction too. https://gitlab.gnome.org/GNOME/mutter/merge_requests/357
The existing ones are statically inlined, so there is no .c file right now. https://gitlab.gnome.org/GNOME/mutter/merge_requests/366
The order and way include macros were structured was chaotic, with no real common thread between files. Try to tidy up the mess with some common scheme, to make things look less messy.