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

[Eli Zaretskii <eliz@gnu.org>]

> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Tue, 31 Jul 2018 12:59:37 +0100
> 
> > Another possibility is to use read-char-exclusive which only changes
> > ERROR_NON_ASCII to 0.  The downside is that when there are mouse clicks
> > it prints the events into the minibuffer, covering the prompt (but
> > typing "?"  still works to restore the prompt).
> 
> AS you have done, I read the implementation and tried a patch using
> `read-char-exclusive'. The result is unusable as the printed events
> obscure the original question.

I think "unusable" is an exaggeration, since you can recover the
prompt.  And the result is definitely better than the current
situation, where you just get stuck.

> The proper long term fix for this is to make read-multiple-choice use a
> dedicated buffer rather than the minibuffer, and give better visibility
> when more than one question is asked in succession. Perhaps also some
> way to stop the echo area from obscuring the minibuffer ?

The echo-area messages are fine, but we should have a feature that
allows to suppress echoing the mouse clicks.