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:             setState(() {
                _useLightTheme = value;
              });
            }),
      );
    }
  }
  
negative.code: 
  class _MyAppState extends State<MyApp> {
    bool _useLightTheme = true;
    double _timeDilation = 1.0;
    Timer _timeDilationTimer;
  
    @override
    void initState() {
      _timeDilation = timeDilation;
      super.initState();
    }
  
    @override
    void dispose() {
      _timeDilationTimer?.cancel();
      _timeDilationTimer = null;
      super.dispose();
    }
  
    @override
    Widget build(BuildContext context) {
  