Subject: RE: bug#18844: Trunk: typing in minibuffer gets spuriously echoed in mode line.

From: Drew Adams <[email-masked]>
Date: Sun, 26 Oct 2014 09:33:59 -0700 (PDT)

> > With the "latest" trunk (of about 2014-10-26 08:00 GMT), start
> > emacs -Q. Type in "M-: (setq" and wait ~half a second.  The word
> > "setq" is spuriously echoed at the start of the mode line.
> 
> It's a feature: Emacs shows you some minimal documentation on what
> you type.

One person's feature is another's annoyance.  And not every such is
imposed as the default behavior, out of the blue.