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.
PDFViewerApplication.pdfViewer.presentationModeState = evt.state;
}
function webViewerSidebarViewChanged(evt) {
  PDFViewerApplication.pdfRenderingQueue.isThumbnailViewEnabled =
    PDFViewerApplication.pdfSidebar.isThumbnailViewVisible;
  const store = PDFViewerApplication.store;
  if (store && PDFViewerApplication.isInitialViewSet) {
    
    store.set("sidebarView", evt.view).catch(function () {});
  }
}
function webViewerUpdateViewarea(evt) {