bug#60015: 29.0.60; multi-line messages truncated in non-selected minibuffer

[Eli Zaretskii <eliz@gnu.org>]

> Date: Thu, 15 Dec 2022 16:44:29 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: Eli Zaretskii <eliz@gnu.org>, 60015@debbugs.gnu.org
> 
> Is this not something that can be solved in set-minibuffer-message, like 
> this:
> 
> diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el
> index 6e42296e7ba..c10a6401180 100644
> --- a/lisp/minibuffer.el
> +++ b/lisp/minibuffer.el
> @@ -817,6 +817,11 @@ set-minibuffer-message
>                             ;; Make sure we can put-text-property.
>                             (copy-sequence message)
>                           (concat " [" message "]")))
> +        (let ((window-lines (window-height minibuf-window))
> +              (message-lines (length (split-string message "\n"))))
> +          (when (> message-lines window-lines)
> +            (with-selected-window minibuf-window
> +              (enlarge-window (- message-lines window-lines)))))
>           (unless (or (null minibuffer-message-properties)
>                       ;; Don't overwrite the face properties the caller has set
>                       (text-properties-at 0 message))

This won't catch the case of a single very long line (which wraps to
produce several screen lines).

Also, unconditionally enlarging the mini-window is not a good idea
because it might already be tall enough.  Try the above in the recipe
posted by Juri, but then type "C-c C-c" several times -- doesn't it
keep enlarging the mini-window with each "C-c C-c"?