anchor.diff:        case _DemoState.info:
           section = _DemoSectionInfo(
             maxHeight: maxSectionHeight,
  +          maxWidth: maxSectionWidth,
             title: _currentConfig.title,
             description: _currentConfig.description,
           );
  
positive.code:   const _DemoSectionOptions({
      Key key,
      this.maxHeight,
      this.configurations,
      this.configIndex,
      this.onConfigChanged,
    }) : super(key: key);
  
    final double maxHeight;
    final List<GalleryDemoConfiguration> configurations;
    final int configIndex;
    final ValueChanged<int> onConfigChanged;
  
negative.code:   const _DemoSectionInfo({
      Key key,
      this.maxHeight,
      this.maxWidth,
      this.title,
      this.description,
    }) : super(key: key);
  
    final double maxHeight;
    final double maxWidth;
    final String title;
    final String description;
  
  