Hello Juri,

I added code to make the frame setting of tab-bar-lines as well as the
default-frame-alist value dependent on tab-bar-show to the
tab-bar-mode function.
I think with this the part to which sets frame parameters in
tab-bar-show :set is not needed because (tab-bar-mode 1) is called
anyway, which already does everything.

What do you think about the attached patch?

Cheers
Bastian

On Fri, Feb 5, 2021 at 3:11 PM Bastian Beranek
<bastian.beischer@gmail.com> wrote:
>
> Hello Juri,
>
> I now installed your patch and I don't think it is complete yet.
>
> 1) Is the :set function actually used the next time emacs starts after
> customizations have been written to .emacs and variables are
> initialized to customized values using (custom-set-variables ...)? I
> don't think it is, right?
>
> 2) Switching tab-bar-mode on and off seems to overwrite the
> tab-bar-lines information in default-frame-alist:
>
>     ;; If the user has given `default-frame-alist' a `tab-bar-lines'
>     ;; parameter, replace it.
>     (if (assq 'tab-bar-lines default-frame-alist)
>         (setq default-frame-alist
>               (cons (cons 'tab-bar-lines val)
>                     (assq-delete-all 'tab-bar-lines
>                                      default-frame-alist)))))
>
> This code should depend on the value of tab-bar-show, right?
>
> Cheers
> Bastian