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Surfaces belonging to a screen-casted window should always be considered visible even if they are not visible on any stage view - be it because they are on a different workspace, minimized or occluded. Doing this in an optimal fashion is highly complex right now - interdependent with (and somewhat similar to) ClutterClones. Thus treat stream-casted surfaces similar to those with clones, with the small difference that even a fully invisible surface still gets a primary view - the fastest one. This ensures that clients never refresh too slow for a screen-cast, at the cost of sometimes refreshing too fast. The later only happens on certain multi-monitor setups and should thus be acceptable. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2789>