Since #12241 we have notifications for this when the user navigates away from the viewer, but we do not yet warn when switching documents, which means that if you call e.g. `PDFViewerApplication.open` with a new document (or directly call `BaseViewer.setDocument` when using the viewer components standalone) there won't be any warning about losing form data. This should be addressed.
this._delayedFallback(UNSUPPORTED_FEATURES.javaScript);
        return true;
      });
      if (!triggerAutoPrint) {
        
        for (const js of javaScript) {
          if (js && AutoPrintRegExp.test(js)) {
            triggerAutoPrint = true;
            break;
          }
        }
      }
    }
    if (triggerAutoPrint) {
      this.triggerPrinting();
    }
  },
  /**
   * @private
   */
  async _initializeMetadata(pdfDocument) {
    const {
      info,
      metadata,
      contentDispositionFilename,
      contentLength,
    } = await pdfDocument.getMetadata();
    if (pdfDocument !== this.pdfDocument) {
      return; 
    }