bug#57161: 28.1.91; two column windows merge leaves 2nd column window showing

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,  Van Ly <van.ly@sdf.org>,
>   57161@debbugs.gnu.org
> Date: Mon, 15 Aug 2022 07:58:41 +0200
> 
> So the normal user reaction to <f2> is probably "uhm... `C-g'...  Emacs
> sucks..."

We don't need any steenking "normal" users to know that Emacs sucks.