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When moving the pending state of an effectively synchronized subsurface so it is applied together with the parent, perform a merge of the source MetaWaylandPendingState into the destination one, instead of simply overwriting the struct. The other approach had 2 kind of leaks, one that would happen everytime a wl_surface.commit happens on a sync subsurface (both surface/buffer damage regions are leaked). The other more unlikely one would apply on the rest of pending state data, happening whenever the compositor gets >1 wl_surface.commit calls on the subsurface before the parent surface gets its own. The function has also been renamed to use the more descriptive "merge" term. Related: gnome-shell#64