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