anchor.diff:            title: widget.title,
             useLightTheme: widget.useLightTheme,
             onThemeChanged: widget.onThemeChanged,
  -//          timeDilation: widget.timeDilation,
  -          onTimeDilationChanged: (double value) {
  -
  -          },
  +          timeDilation: widget.timeDilation,
  +          onTimeDilationChanged: widget.onTimeDilationChanged,
             textScaleFactor: _textScaleFactor,
             onTextScaleFactorChanged: (double value) {
               setState(() {
  
positive.code:   final String title;
    final bool useLightTheme;
    final ValueChanged<bool> onThemeChanged;
  
    @override
    _MyHomePageState createState() => new _MyHomePageState();
  
negative.code:     @required this.prismic,
      this.title,
      this.useLightTheme,
      @required this.onThemeChanged,
      this.timeDilation,
      this.onTimeDilationChanged,})
        : assert(prismic != null),
          assert(onThemeChanged != null),
          assert(onTimeDilationChanged != null),
          super(key: key);
  
    final Prismic prismic;
  