Hi Eli,
* Gregor Zattler <grfz@gmx.de> [2022-11-09; 15:35 +01]:
> * Eli Zaretskii <eliz@gnu.org> [2022-11-09; 16:06 +02]:
>> The backtrace seems to indicate that it reads from the minibuffer, but
>> in that case, does it mean the mini-window was 7-lines high in this
>> case?
>
> quite possible, I have quite a few saved searches which are
> presented to me.  The hight of the minibuffer also depends
> on the frames width.  If the frame is half of the width of
> my monitor the choices are listed in 6 lines, then there is
> a blan line and a final line with a prompt.  In fullscreen
> it's 3 lines of choices, the blank line and the prompt.

see attached screenshot: