bug#32257: 26.1; read-multiple-choice inf loops on mouse clicks

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@gmail.com>
> Date: Tue, 21 May 2019 20:52:34 -0400
> Cc: 32257@debbugs.gnu.org
> 
> >> Fixing a problem and introducing another doesn't sound wise to me.
> >> We've been there several times during the last years, and I don't want
> >> to make the same mistake again.  Sorry.
> >
> > Perhaps reverting the patches that introduced read-multiple-choice
> > is the right answer then.
> 
> How about for emacs-26, we call read-event only after receiving the
> problematic error.  This works around the problem, and should be safe
> enough, since it only triggers when we would otherwise be ending up in
> an infloop anyway.

SGTM, thanks.