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

[Juri Linkov]

> Btw, the current code on master also removes the overlays where
> icomplete shows the completion candidates.  You can try it:
>
>   . Evaluate:
>
>     (defun my-message ()
>       (interactive)
>       (message "my most important message"))
>     (global-set-key [f5] 'my-message)
>
>   . M-x icomplete-mode RET
>   . C-x C-f
>   . F5
>
> After "C-x C-f" the list of candidates will be displayed in the
> minibuffer; pressing F5 removes the list and shows the message
> instead.

That's not fair.  I fixed this already a week ago.
But you didn't allow me to install the fix.