bug#38457: 27.0.50; dabbrev-expand regression due to message change

[Dmitry Gutov]

Eli, don't you think we should iron out this new feature's interaction 
with icomplete and ido before the release?

On 25.12.2019 19:30, Dmitry Gutov wrote:
> > Could ido-mode use an overlay the same way as it's used in icomplete
> > that plays nicely with the set-minibuffer-message overlay?
>
> This seems to work, but it needs more testing:
>
> diff --git a/lisp/ido.el b/lisp/ido.el
> index 79f259b819..d47450fc40 100644
> --- a/lisp/ido.el
> +++ b/lisp/ido.el
> @@ -4492,6 +4492,8 @@ ido-initiate-auto-merge
>       (ido-tidy))
>         (throw 'ido contents))))
>
> +(defvar ido--overlay nil)
> +
>   (defun ido-exhibit ()
>     "Post command hook for Ido."
>     ;; Find matching files and display a list in the minibuffer.
> @@ -4726,7 +4728,12 @@ ido-exhibit
>       (let ((inf (ido-completions contents)))
>         (setq ido-show-confirm-message nil)
>         (ido-trace "inf" inf)
> -      (insert inf))
> +          (when ido--overlay
> +            (delete-overlay ido--overlay))
> +          (let ((o (make-overlay (point-max) (point-max) nil t t)))
> +            (when (> (length inf) 0)
> +              (put-text-property 0 1 'cursor t inf))
> +            (overlay-put o 'after-string inf)
> +            (setq ido--overlay o)))
>       ))))
>
>   (defun ido-completions (name)