anchor.diff:      Object key,
       UINode toolbar,
       UINode body,
  -    UINode statusbar,
  +    UINode statusBar,
       UINode drawer,
       UINode floatingActionButton
     }) : _toolbar = toolbar,
          _body = body,
  -       _statusbar = statusbar,
  +       _statusBar = statusBar,
          _drawer = drawer,
          _floatingActionButton = floatingActionButton,
          super(key: key);
   
     UINode _toolbar;
     UINode _body;
  -  UINode _statusbar;
  +  UINode _statusBar;
     UINode _drawer;
     UINode _floatingActionButton;
   
  
positive.code:       removeChild(_toolbar);
      if (_body != null)
        removeChild(_body);
      if (_statusbar != null)
        removeChild(_statusbar);
      if (_drawer != null)
        removeChild(_drawer);
      if (_floatingActionButton != null)
  
negative.code:       bodyHeight -= toolbarHeight;
      }
      if (_slots[ScaffoldSlots.statusBar] != null) {
        RenderBox statusBar = _slots[ScaffoldSlots.statusBar];
        statusBar.layout(new BoxConstraints.tight(new Size(size.width, kStatusBarHeight)));
        assert(statusBar.parentData is BoxParentData);
        statusBar.parentData.position = new Point(0.0, size.height - kStatusBarHeight);
        bodyHeight -= kStatusBarHeight;
      }
      if (_slots[ScaffoldSlots.body] != null) {
        RenderBox body = _slots[ScaffoldSlots.body];
  