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.
>
> Sorry, I don't think I follow: what did you want to fix in this
> scenario?

I already fixed this 10 days ago.  If the patch was installed then
you wouldn't say that the current code on master removes the icomplete
overlays.  Because the patch doesn't remove the icomplete overlays.
Its behavior is so smooth that it would be unfortunate to implement
something worse than that.