Jonas Ådahl 25c53b2fb2 backend: Freeze frame clock when headless
Don't schedule redraws when being headless; there is nothing to draw so
don't attempt to draw. This also makes a flaky test become non-flaky, as
it previously spuriously got warnings due to windows being "painted"
when headless but lacking frame timings, as nothing was actually
painted.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/170
2018-11-09 11:16:30 +01:00
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