bug#46299: 28.0.50; Value of tab-bar-show not respected in new frames.

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Date: Sun, 14 Feb 2021 20:44:20 +0200
> Cc: 46299@debbugs.gnu.org
> 
> More low-level test case:
> 
>   (set-frame-parameter nil 'tab-bar-lines 0)
>   (set-frame-parameter nil 'tab-bar-lines 1)
>   (set-frame-parameter nil 'tab-bar-lines 0)
> 
> that breaks the menu bar.

It doesn't break the menu bar here.  What kind of breakage are we
talking about, and in what Emacs configuration?