anchor.diff:    void _closeCurrentCanvas() {
       _canvasPool.closeCurrentCanvas();
       _childOverdraw = true;
  +    _cachedLastCssFont = null;
     }
   
     void setCssFont(String cssFont) {
  
positive.code:       }
      }
      _children.clear();
      _cachedLastCssFont = null;
      _setupInitialTransform();
    }
  
negative.code:     if (blendMode != null) {
        element.style.mixBlendMode = _stringForBlendMode(blendMode) ?? '';
      }
      // Switch to preferring DOM from now on, and close the current canvas.
      _closeCurrentCanvas();
    }
  
    @override
  