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RFC: wayland: Track subsurface position in parent's SurfaceState

Vlad Zahorodnii requested to merge work/zzag/subsurface-position-state into master

It's a prerequisite for allowing to delay applying surface state.

SubSurfaceInterface has cached position in order to emit the SubSurfaceInterface::positionChanged() signal and to avoid redundant hash table lookups in hot input code path.

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