@NotNull
    private WorkingCopyFormat displayUpgradeDialog() {
      final UpgradeFormatDialog dialog = new UpgradeFormatDialog(myProject, myPath, false);
      final ModalityState dialogState = any();

      dialog.startLoading();
      getApplication().executeOnPooledThread(() -> {
        final List<WorkingCopyFormat> formats = loadSupportedFormats();

        getApplication().invokeLater(() -> {
          final String errorMessage = error.get();

          if (errorMessage != null) {
            dialog.doCancelAction();
            showErrorDialog(message("message.text.cannot.load.supported.formats", errorMessage),
                            message("dialog.title.check.out"));
          }
          else {
            dialog.setSupported(formats);
            dialog.setData(getFirstItem(formats, UNKNOWN));
            dialog.stopLoading();
          }
        }, dialogState);
      });

      return dialog.showAndGet() ? dialog.getUpgradeMode() : UNKNOWN;
    }
@NotNull
    private WorkingCopyFormat displayUpgradeDialog()