On Sat, 7 Sept 2024 at 09:37, martin rudalics <rudalics@gmx.at> wrote:

>
> -#if defined (USE_X_TOOLKIT) || defined (USE_GTK)
> +#if defined (USE_X_TOOLKIT) && !defined (USE_GTK)
>

OK, so I applied this patch and ran `emacs -Q`, then did C-x 5 2 and got
the usual small window and error:

(emacs:3159980): Gtk-CRITICAL **: 13:05:49.056:
gtk_distribute_natural_allocation: assertion 'extra_space >= 0' failed


> Now set
>
> (setq default-frame-alist '((menu-bar-lines . 0)))
>
> and do C-x 5 2.  How does that behave?
>

That opens a small window with no error message.

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