bug#67715: 28.2; Minibuffer content is sometimes unexpectedly partially hidden

[Eli Zaretskii]

> From: Markus Triska <triska@metalevel.at>
> Cc: 67715@debbugs.gnu.org
> Date: Sat, 09 Dec 2023 08:04:40 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Why did you expect the mini-window to resize in this case?
> 
> The Emacs Lisp documentation states in section 21.1:
> 
>     The minibuffer’s window is normally a single line; it grows
>     automatically if the contents require more space.

As I said, this is currently limited to showing echo-area messages and
prompts for the user to type some input.  The text above didn't
imagine someone will want to use the mini-window as a normal window
and just insert there some arbitrary text.

> I added (fit-window-to-buffer) after inserting the text, and still the
> text is not fully visible. fit-window-to-buffer is documented as:
> 
>     Adjust size of WINDOW to display its buffer’s contents exactly.
> 
> I would greatly prefer if Emacs works as documented. Should I file a
> separate issue for this, or is this also a case of wontfix? Is there any
> way to solve the issue?

I don't know.  You haven't actually explained what you are trying to
accomplish and why you use this strange way of accomplishing it.  Why
not, for example, use the minibuffer-prompt face instead to show the
prompt in a different typeface?

But yes, it is possible that we will not want to fix that, since the
change was to solve a more serious issue, and I don't see how these
two issues could be reconciled given the way redisplay currently
works.

The basic technical reason for what you see is that redisplay is
inhibited when with-selected-window returns and restores the selected
window, which is in your case the opportunity to resize the
mini-window.  When redisplay is inhibited, the code which resizes the
mini-window returns without doing anything.  So one way of fixing this
would be to try to avoid with-selected-window, and instead use some
other way of achieving what you want to do.