public static @NlsContexts.DialogMessage String getCannotRefactorMessage(final @NlsContexts.DialogMessage @Nullable String message) {
    return message("cannot.perform.refactoring") + (message == null ? "" : "\n" + message);
  }
public static @NlsContexts.DialogMessage String getCannotRefactorMessage(final @NlsContexts.DialogMessage @Nullable String message)