Re: Partly deferred font-locking?

[Eli Zaretskii]

> From: Michael Heerdegen <michael_heerdegen@web.de>
> Date: Thu, 12 Jan 2023 15:33:03 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > > That would have to be done in Emacs, not in my code, right?
> >
> > Depends on whether the additional highlighting will be part of
> > jit-lock.el or not.  The display engine only cares whether the value
> > of 'fontified' is nil or not.
> 
> I can't image a solution that is not part of jit-lock.
> 
> > while-no-input is not a way to interrupt an on-going calculation,
> > because it requires Emacs to check whether any input arrived, and
> > Emacs only does that when it's idle.
> 
> Only when idle?  Why is
> 
>   (while-no-input (while t (+ 1 1)))
> 
> interruptable?

Yes, the Lisp interpreter also tests for input in many places.  But if
you call a C library function, that won't happen until it returns.