@NotNull
      private Stack<@NlsContexts.ProgressText String> getTextStack() {
        Stack<@NlsContexts.ProgressText String> stack = myTextStack;
        if (stack == null) myTextStack = stack = new Stack<>(2);
        return stack;
      }
@NotNull
      private Stack<@NlsContexts.ProgressText String> getTextStack()