@Override
 public void addScenarioActor(TimelineScenarioActor actor) {
   super.addScenarioActor(actor);
   if (this.lastActor != null) {
     super.addDependency(actor, this.lastActor);
   }
   this.lastActor = actor;
 }
 @Override
 public void addScenarioActor(TimelineScenarioActor actor) {
   super.addScenarioActor(actor);
   this.addedSinceLastRendezvous.add(actor);
 }