Implement the wp-tearing-control-v1 protocol allowing window to hint
the compositor that they prefer async "tearing" page flips.
Add tearing/no-tearing rules to allow the user to manually
enabled/disable tearing for a window.
Use async "tearing" page flips when a window that should be allowed to
tear is fullscreen.
This still requires several kernel patches to work with the wlroots
atomic DRM backend. For now, either set WLR_DRM_NO_ATOMIC=1 or use a
custom kernel that includes the unmerged patches (such as CachyOS).
Closes: https://codeberg.org/river/river/issues/1094
The wlroots Wayland backend does not support gamma LUT application and
will currently fail to render anything if river commits a gamma LUT.
To fix this, test the state when applying a gamma LUT and fall back to a
state with no gamma LUT set if that fails.
This problem was revealed by 2e09b66 which flags gamma as dirty on all
outputs when they are enabled.
