無効なアイテムが top_menu 設定に追加できてしまう

[fefrei (Felix Freiberger)]

@sam

You can not longer “magic” a category into top menu which we used to support, this has to be done in a theme.

Is there a howto for that? I thought I saw one, but my skills didn’t suffice to dig it out again – or it never existed and I just hallucinated