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protocol: make it clear wl_surface.enter/leave are not for frame throttling

Simon Ser requested to merge emersion/wayland:surface-leave-frame-throttling into master

Some clients rely on wl_surface.enter/leave to start/stop their rendering loop.

There are cases where this doesn't work:

  • Some compositors don't send wl_surface.leave when a toplevel is hidden. For instance Sway doesn't send this event when a toplevel is on an inactive workspace (but doesn't send wl_surface.frame events).
  • Some compositors might still want applications to continue to render even if away from outputs. For instance a compositor that allows to screen record individual toplevels might not send a wl_surface.enter event for hidden toplevels.

Signed-off-by: Simon Ser contact@emersion.fr

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