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Eli Zaretskii <eliz@gnu.org> writes:

> But there's also the mini-window: if we don't do something there,
> you'll see the mode line move up and down in annoying ways, depending
> on what text is displayed in the mini-window and which fonts it uses.
> And the mini-window is mostly just another window.  So I think we
> should decide what to do with window-body display as well (see my
> other message about this in bug#51821 discussion), not just with
> mode-line, tab-line, etc.

Sadly, that means we are on our own here: other programs do not have
such a mini-window.

The closest to them that exist in other GUI programs are the URL and
search boxes in modern web browsers.  FWIW, they are also of a fixed
height and do not change in size based on their contents.