anchor.diff:          title: const Text('Icons')
         ),
         body: new IconTheme(
  -        data: new IconThemeData(opacity: iconOpacity),
  +        data: new IconThemeData(color: iconColor),
           child: new Padding(
             padding: const EdgeInsets.all(24.0),
             child: new Column(
  
positive.code:     return new IconButton(
        icon: new Icon(icon),
        iconSize: iconSize,
        color: iconColor,
        tooltip: "${enabled ? 'Enabled' : 'Disabled'} icon button",
        onPressed: enabled ? handleIconButtonPress : null
      );
  
negative.code:   ];
  
    int iconColorIndex = 8; // teal
  
    Color get iconColor => iconColors[iconColorIndex];
  
  