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.
switch (evt.action) {
    case "GoToPage":
      PDFViewerApplication.appConfig.toolbar.pageNumber.select();
      break;
    case "Find":
      if (!PDFViewerApplication.supportsIntegratedFind) {
        PDFViewerApplication.findBar.toggle();
      }
      break;
    case "Print":
      PDFViewerApplication.triggerPrinting();
      break;
    case "SaveAs":
      webViewerSave();
      break;
  }
}
function webViewerPresentationModeChanged(evt) {