anchor.diff:    }
   
     @HostListener('mousedown')
  +  @visibleForTemplate
     void handleMouseDown(MouseEvent mouseEvent) {
       // This removes the text selection behavior of mousedown.
       if (readOnly) {
  
positive.code:   ///
    /// When the checkbox is unchecked, the ripple color does not follow theme
    /// color.
    String get rippleColor => checked ? themeColor : '';
  
    /// Label for the checkbox, alternatively use content.
  
negative.code:   }
  
    /// Current icon, depends on the state of [checked] and [indeterminate].
    @visibleForTemplate
    Icon get icon => _icon;
    Icon _icon = uncheckedIcon;
  
  