Re: Partly deferred font-locking?

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: Michael Heerdegen <michael_heerdegen@web.de>, emacs-devel@gnu.org
> Date: Thu, 12 Jan 2023 14:30:32 +0000
> 
> I just tried
> 
> (while-no-input (let ((x 0)) (while t (cl-incf x) (when (> 3 (random 
> 1000000)) (message "%d" x)))))
> 
> and it does not block.

Do you understand why?  Specifically: which code in Emacs caused us to
throw on input in this case?  And is that going to happen when Emacs
calls a C function that hits the disk?