Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: acm@muc.de,  emacs-devel@gnu.org
> Date: Sat, 04 Sep 2021 13:47:09 -0400
> 
> IIRC it's a result of the redisplay skipping invisible text and hence not
> calling `fontification-functions` on it.

My reading of the xdisp.c code is that it first invokes
fontification-functions, and only after that checks for invisible
text.  See handle_stop and the way it iterates over the handlers in
the it_props array.

Do you have some Lisp to show that invisible text isn't fontified by
jit-lock?