In the following spots a "MouseUp" eventName is being used, which does look inconsistent considering that the "Mouse Down"/"Mouse Enter"/"Mouse Exit" eventNames all have a space in them.
Is this inconsistency actually expected, or is it a simple typo? If the former, then a comment explaining *why* would be appropriate; otherwise we should just fix this :-)

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L806

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L945

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L1034

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L1168

/cc @calixteman 
super(parameters, { isRenderable: true });
    const { filename, content } = this.data.file;
    this.filename = getFilenameFromUrl(filename);
    this.content = content;
    this.linkService.eventBus?.dispatch("fileattachmentannotation", {
      source: this,
      id: stringToPDFString(filename),
      filename,
      content,
    });
  }
  render() {
    this.container.className = "fileAttachmentAnnotation";
    const trigger = document.createElement("div");
    trigger.style.height = this.container.style.height;
    trigger.style.width = this.container.style.width;
    trigger.addEventListener("dblclick", this._download.bind(this));
    if (!this.data.hasPopup && (this.data.title || this.data.contents)) {
      this._createPopup(trigger, this.data);
    }
    this.container.appendChild(trigger);
    return this.container;
  }
  /**
   * Download the file attachment associated with this annotation.
   *
   * @private
   * @memberof FileAttachmentAnnotationElement
   */
  _download() {