anchor.diff:              CustomListItem(
                 user: 'Flutter',
                 viewCount: 999000,
  -              thumbnail: Icon(Icons.videocam, size: 80, color: Colors.blueGrey),
  +              thumbnail: Icon(
  +                Icons.videocam,
  +                size: 80,
  +                color: Colors.blueGrey,
  +              ),
                 title: 'The Flutter YouTube Channel',
               ),
               CustomListItem(
                 user: 'Dash',
                 viewCount: 884000,
  -              thumbnail: Icon(Icons.flight_takeoff, size: 80, color: Colors.blueGrey),
  +              thumbnail:
  +                Icon(
  +                  Icons.flight_takeoff,
  +                  size: 80,
  +                  color: Colors.blueGrey,
  +                ),
                 title: 'Announcing Flutter 1.0',
               ),
             ],
  
positive.code: 
    @override
    Future<List<DiagramMetadata>> get diagrams async => <DiagramMetadata>[
      const CustomListItemDiagram('custom_list_item'),
    ];
  
    @override
    Future<File> generateDiagram(DiagramMetadata diagram) async {
  
negative.code:       child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            Text(
              title,
              style: const TextStyle(
                fontWeight: FontWeight.w500,
                fontSize: 14.0,
              ),
            ),
            const Padding(padding: EdgeInsets.symmetric(vertical: 2.0)),
            Text(
              user,
              style: const TextStyle(
                fontSize: 10.0,
              ),
            ),
            const Padding(padding: EdgeInsets.symmetric(vertical: 1.0),
            Text(
              '$viewCount views',
              style: const TextStyle(fontSize: 10.0),
            ),
          ],
        ),
  