anchor.diff:    ];
   
     int iconColorIndex = 8; // teal
  -  double iconOpacity = 1.0;
   
     Color get iconColor => iconColors[iconColorIndex];
   
  
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:         title: const Text('Icons')
        ),
        body: new IconTheme(
          data: new IconThemeData(color: iconColor),
          child: new Padding(
            padding: const EdgeInsets.all(24.0),
            child: new Column(
  