@Nullable
  private static String getSelectedPrefixText(@NotNull ResourceBundleEditor resourceBundleEditor) {
    Object item = resourceBundleEditor.getSelectedElementIfOnlyOne();
    if (item instanceof PropertiesPrefixGroup prefixGroup) {
      return prefixGroup.getPrefix() + prefixGroup.getSeparator();
    }
    return null;
  }
@Nullable
  private static String getSelectedPrefixText(@NotNull ResourceBundleEditor resourceBundleEditor)