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

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Juri Linkov <juri@linkov.net>,  38457@debbugs.gnu.org
> Date: Wed, 11 Dec 2019 12:34:26 -0500
> 
> You understood correctly: I do not consider this a bug (tho it might be
> purely accidental, as I suspect it is: it's likely the result of the
> fact that the list of completion is removed by icomplete before
> processing a command and re-added afterwards, and minibuffer-message
> adds a 2s wait during the execution of the command, i.e. at a point in
> time where icomplete's list is not displayed).

I actually thought this was the result of adding an overlay at the
end, which "covers" the icomplete's overlay.  But I didn't look
closely at the code, so maybe I'm wrong.