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 
idFactoryMock
      ).then(({ data }) => {
        expect(data.annotationType).toEqual(AnnotationType.LINK);
        expect(data.url).toEqual("http://www.example.com/test.pdf#15");
        expect(data.unsafeUrl).toEqual("http://www.example.com/test.pdf#15");
        expect(data.dest).toBeUndefined();
        expect(data.newWindow).toBeFalsy();
        done();
      }, done.fail);
    });
    it("should correctly parse a GoToR action, with explicit destination array", function (done) {
      const actionDict = new Dict();
      actionDict.set("Type", Name.get("Action"));
      actionDict.set("S", Name.get("GoToR"));
      actionDict.set("F", "http://www.example.com/test.pdf");
      actionDict.set("D", [14, Name.get("XYZ"), null, 298.043, null]);
      const annotationDict = new Dict();
      annotationDict.set("Type", Name.get("Annot"));
      annotationDict.set("Subtype", Name.get("Link"));
      annotationDict.set("A", actionDict);
      const annotationRef = Ref.get(489, 0);
      const xref = new XRefMock([{ ref: annotationRef, data: annotationDict }]);
      AnnotationFactory.create(
        xref,
        annotationRef,
        pdfManagerMock,
        idFactoryMock
      ).then(({ data }) => {
        expect(data.annotationType).toEqual(AnnotationType.LINK);
        expect(data.url).toEqual(