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

[Juri Linkov]

>> IDK, I tried to set resize-mini-windows to nil and in icomplete-mode
>> can see the message.
>
> My bad, last time I was trying it was with ido-mode. There, the message
> comes at the end of all completions.
>
> With icomplete, however, it's printed before the completions. And it also
> appears to the left of the cursor. Is that intentional?

Code in set-minibuffer-message was copied from minibuffer-message
where handling of the cursor and after-string overlay was intentional.

Could ido-mode use an overlay the same way as it's used in icomplete
that plays nicely with the set-minibuffer-message overlay?