On Wed, 4 Sept 2024 at 18:11, martin rudalics <rudalics@gmx.at> wrote:

>  > Just to check, you're suggesting that I bisect from emacs-29.3 (I use
> that
>  > tag because it's what the version of 29 I'm using is built from) to
> master
>  > HEAD, to find at which commit C-x 5 2 opens a small window immediately
>  > (without disabling menu-bar-mode)?
>
> That's the idea, yes.
>

Thanks for confirming.

My bisection suggests the problematic commit is
241616831024c9c9fe2b2378b611db0a560b9675

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