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