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