anchor.diff:    final bool isPrimary;
   
     SyntheticPointerEvent(
  -      bubbles,
  -      cancelable,
  -      currentTarget,
  -      _defaultPrevented,
  -      _preventDefault,
  -      stopPropagation,
  -      eventPhase,
  -      isTrusted,
  -      nativeEvent,
  -      target,
  -      timeStamp,
  -      type,
  +      bool bubbles,
  +      bool cancelable,
  +      bool currentTarget,
  +      bool _defaultPrevented,
  +      dynamic _preventDefault,
  +      dynamic stopPropagation,
  +      num eventPhase,
  +      bool isTrusted,
  +      dynamic nativeEvent,
  +      dynamic target,
  +      num timeStamp,
  +      String type,
         this.pointerId,
         this.width,
         this.height,
  
positive.code:   final num deltaZ;
  
    SyntheticWheelEvent(
        bubbles,
        cancelable,
        currentTarget,
        _defaultPrevented,
        _preventDefault,
        stopPropagation,
        eventPhase,
        isTrusted,
        nativeEvent,
        target,
        timeStamp,
        type,
        this.deltaX,
        this.deltaMode,
        this.deltaY,
        this.deltaZ)
        : super(
              bubbles,
              cancelable,
              currentTarget,
  
negative.code: 
  class SyntheticFormEvent extends SyntheticEvent {
    SyntheticFormEvent(
      bool bubbles,
      bool cancelable,
      bool currentTarget,
      bool _defaultPrevented,
      dynamic _preventDefault,
      dynamic stopPropagation,
      num eventPhase,
      bool isTrusted,
      dynamic nativeEvent,
      dynamic target,
      num timeStamp,
      String type,
    ) : super(
              bubbles,
              cancelable,
              currentTarget,
  