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clutter/master-clock: Destroy source when paused

Jonas Ådahl requested to merge jadahl/mutter:wip/actually-freeze-master-clock into master

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.

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