bug#34535: 27.0.50; emacs -nw: while-no-input + sit-for + <KEY> => Quit

[Eli Zaretskii]

> From: Michael Heerdegen <michael_heerdegen@web.de>
> Cc: monnier@iro.umontreal.ca,  34535@debbugs.gnu.org
> Date: Sun, 24 Feb 2019 08:16:51 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Please note that using while-no-input with BODY that reads some input
> > in a way causes indeterminate results, because whether the arriving
> > input will be read and consumed by BODY and/or used to throw control
> > flow out of BODY, depends on seemingly random factors, like whether
> > Emacs checks quit-flag before or after BODY consumes the input and
> > acts upon it.
> 
> I hope this is not the case in my code.  In the w-n-i BODY I perform a
> computation, but as in the skeleton I posted, the BODY itself doesn't
> read input.  The w-n-i with the computation is done in a function in
> 'minibuffer-setup-hook'.  Is that allowed?

Your description indicates that in your case BODY doesn't by itself
read input, so you should be OK, I think.