dc9c5417bc
Since Clutter's backend relies on MetaBackend now, initialzation has to go through meta_init(), both in mutter and in gnome-shell. However the compositor enum and backend gtype used to enforce the environment used for tests are private, so instead expose a test initialization function that can be used from both mutter and gnome-shell. https://gitlab.gnome.org/GNOME/mutter/merge_requests/750