626c3745e2
Pausing the master clock didn't actually pause it if there was already a scheduled frame in progress. This is problematic if one actually expects to see no new frame scheduling to happen after pausing, for example it caused actor 'pre-paint' to be signalled on actors, but nothing was ever painted. Avoid this by destroying the master clock source when pausing, and then recreating it when resuming. https://gitlab.gnome.org/GNOME/mutter/merge_requests/309