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backend/drm: atomic improvements

Simon Ser requested to merge github/fork/emersion/drm-atomic-vrr into master

This PR:

  • Makes adaptive sync atomic
  • Performs a blocking atomic commit if no modeset or buffer is pending

The second point fixes output state updates not applied when no modeset or page-flip is performed. For instance, wlr_output_set_gamma followed by wlr_output_commit was a no-op (but shouldn't be).

No Sway PR required, since wlr_output_enable_adaptive_sync is already followed by wlr_output_commit.

Closes: https://github.com/swaywm/wlroots/issues/2096

Breaking change: wlr_output_enable_adaptive_sync must now be followed by wlr_output_commit to apply the change.

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