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

From: Bastian Beranek <[email-masked]>
Date: Mon, 15 Feb 2021 16:32:24 +0100

On Mon, Feb 15, 2021 at 4:26 PM Eli Zaretskii <[email-masked]> wrote:
>
> > From: Juri Linkov <[email-masked]>
> > Date: Sun, 14 Feb 2021 20:44:20 +0200
> > Cc: [email-masked]
> >
> > 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?

For this to trigger you need to put those lines in a .el file (say
foo.el) and run emacs in text mode and load that file:

emacs -nw -Q -l foo.el

For me there is no menu-bar anymore and using this emacs instance
quickly reveals visual glitches (mode line jumping around for
example). A good way to provoke this is to create a few tabs with C-x
t 2.