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output: make wlr_output_schedule_frame set output->needs_frame #2053
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This way, wlr_output_schedule_frame will always be followed by a
wlr_output_commit. This forces the compositor to render an extra
frame before stopping the rendering loop.
To test, run wleird's frame-callback 1, make sure it's the only
visible client on the output and check the interval between frame
events is the output's refresh period instead of zero.
Closes: #2051