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window-actor/wayland: Improve scanout candidate check

Robert Mader requested to merge rmader/mutter:single-pixel-optimization-follow-up into main

By ignoring obcured surfaces we can generalize the single-pixel-buffer background check to work with arbitrary surface trees, as long as the two top ones are the background and content surfaces.

As a nice side effect of this, clients like Firefox now usually take the shorter meta_window_is_fullscreen (window) && n_visible_surface_actors == 1 route.

Related: gtk!7136 (merged)

Edited by Robert Mader

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