anchor.diff:    double computeMaxIntrinsicWidth(double height) => _minPreferredTrackWidth + _maxSliderPartWidth;
   
     @override
  -  double computeMinIntrinsicHeight(double width) => max(_minPreferredTrackHeight, _maxSliderPartHeight);
  -
  -  @override
  -  double computeMaxIntrinsicHeight(double width) => max(_minPreferredTrackHeight, _maxSliderPartHeight);
  +  double computeMinIntrinsicHeight(double width) => math.max(_minPreferredTrackHeight, _maxSliderPartHeight);
  +
  +  @override
  +  double computeMaxIntrinsicHeight(double width) => math.max(_minPreferredTrackHeight, _maxSliderPartHeight);
   
     @override
     bool get sizedByParent => true;
  
positive.code: 
  import 'dart:async';
  import 'dart:math' as math;
  import 'dart:math';
  
  import 'package:flutter/cupertino.dart';
  import 'package:flutter/foundation.dart';
  
negative.code:   void performResize() {
      size = Size(
        constraints.hasBoundedWidth ? constraints.maxWidth : _minPreferredTrackWidth + _maxSliderPartWidth,
        constraints.hasBoundedHeight ? constraints.maxHeight : math.max(_minPreferredTrackHeight, _maxSliderPartHeight),
      );
    }
  
  