anchor.diff:      });
     }
   
  -  @HostListener('blur')
  -  void onBlur(FocusEvent event) {
  -    // Don't hide the tooltip if the user clicked an empty area on the page.
  -    if (event.relatedTarget == null) return;
  -
  -    // Don't hide the tooltip if focus went to an element inside the tooltip.
  -    HtmlElement el;
  -    for (el = event.relatedTarget; el.parent != null; el = el.parent) {
  -      if (el.className == overlayContainerClassName) return;
  -    }
  -
  -    hideTooltip(immediate: true);
  -  }
  -
     @HostListener('click')
     void onClick() {
       _toggleVisibility();
  
positive.code:   @override
    void onClose() {
      super.onClose();
      hideTooltip(immediate: true);
    }
  }
  
negative.code:     _tooltip?.activate();
    }
  
    @HostListener('click')
    void onBlurOrClick() => hideTooltip();
  
  