anchor.diff:      return _visibleArea;
     }
   
  +  bool _initialized = false;
  +
     // Setup
   
     /// Creates a new SpriteBox with a node as its content, by default uses letterboxing.
  
positive.code: 
      _frameRate = 1.0/delta;
  
      _callConstraintsPreUpdate(delta);
      _runActions(delta);
      _callUpdate(_rootNode, delta);
      _callStepPhysics(delta);
      _callConstraintsConstrain(delta);
  
      // Schedule next update
      _scheduleTick();
  
negative.code:     size = constraints.biggest;
      _invalidateTransformMatrix();
      _callSpriteBoxPerformedLayout(_rootNode);
      _initialized = true;
    }
  
    // Adding and removing nodes
  