clutter/actor: Do not report hidden actors as present on stage view

The stage view list does not get updated when an actor gets hidden in
order to avoid unnecessary work, such as scale changes. However, we
still want `is_effectively_on_stage_view` to report `FALSE` in this
case.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2662>

clutter/clutter/clutter-actor.c

@@ -15715,6 +15715,10 @@ clutter_actor_is_effectively_on_stage_view (ClutterActor     *self,
 
   g_return_val_if_fail (CLUTTER_IS_ACTOR (self), FALSE);
 
+  if (!CLUTTER_ACTOR_IS_MAPPED (self) &&
+      !clutter_actor_has_mapped_clones (self))
+    return FALSE;
+
   if (g_list_find (self->priv->stage_views, view))
     return TRUE;