Re: Why is jit-lock-stealth-time nil by default?

[emacsq via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

> That shouldn't happen.  Emacs uses a JIT fontification feature, which
> is turned on by default, and which should make sure any part of the
> buffer is always fontified before it is displayed.

Is it also true for programmatic features, that is if the user himself doesn't visit those parts, only elisp routines go there and show parts of the buffer? E.g. 'peek' features which fetch unvisited parts of a buffer and show them to the user in a tooltip? I thought JIT does not fontificates those parts.

------- Original Message -------
On Thursday, February 17th, 2022 at 7:26 AM, emacsq <laszlomail@protonmail.com> wrote:

> I use commands which can show unvisited parts of a buffer and I find it
> annoying when those parts are not fontified.
>
> I looked into it and found stealth font locking which performs fontification
> of those parts when the user is idle.
>
> But jit-lock-stealth-time is nil by default. Is there a reason for this? It's a useful
> feature and today's computers have plenty of idle time, so why is not enabled
> out of the box?