Add new frame scheduler interface


  • an equivalent of this if necessary
  • and of this - the condition is not checked anymore after these patches
  • add a helper that can work off wl frame callbacks and headless frame events so that wl-without-presentation-time and headless can work again
  • figure out what's happening to needs_frame (cc #3692). none of the examples handle it, but that was true before, which I guess means they were broken already? (edit: the non-scene examples never stop the rendering loop, so they don't need to handle it)
  • examples: destroy the frame scheduler on output destruction
  • examples: check that wlr_frame_scheduler_schedule_frame() is being called when it should
  • docs
  • more (rigorous) testing
Edited by Rose Hudson

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