anchor.diff:    bool _usePositionSticky = false;
   
     ElementScrollHost(this._domService, this._ngZone,
  -      this._gestureListenerFactory, ElementRef elementRef)
  -      : this.element = elementRef.nativeElement;
  +      this._gestureListenerFactory, this.element);
   
     @override
     void ngOnInit() {
  
positive.code: class AcxPanClassDirective extends BasePanClassDirective
      implements OnInit, OnDestroy {
    AcxPanClassDirective(
        DomService domService, ScrollHost scrollHost, ElementRef elementRef)
        : super(domService, scrollHost, elementRef.nativeElement);
  
    @override
    void ngOnInit() => startPanListener();
  
negative.code:   final ScrollHost _scrollHost;
    final Element _element;
  
    StickyFloatingTracker(this._scrollHost, this._element);
  
    @override
    void ngOnInit() {
  