anchor.diff:                          text: ".\n\nTo see the source code for this app, please visit the "
                         ),
                         new LinkTextSpan(
  -                        style: aboutLinkStyle,
  +                        style: linkStyle,
                           url: 'https://goo.gl/iv1p4G',
                           text: 'flutter github repo'
                         ),
  
positive.code:                   onChanged: (bool value) { onShowPerformanceOverlayChanged(!showPerformanceOverlay); }
                  )
                ]
              )
            ),
            new AboutDrawerItem(
  
negative.code:   Widget build(BuildContext context) {
      final ThemeData themeData = Theme.of(context);
      final TextStyle aboutTextStyle = themeData.textTheme.body2;
      final TextStyle linkStyle = themeData.textTheme.body2.copyWith(color: themeData.accentColor);
  
      return new Drawer(
        child: new Block(
  