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The order of role creation is undetermined, so we can't account that the parent surface will have a role (and an actor) at the time of creating the wl_subsurface role for a child surface. So we must do it both ways, add the subsurface as a child on get_subsurface() if the parent already got a role, and lazily add child subsurface actors to the current one if the parent surface got it at a later point. Related: #132