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

[Eli Zaretskii]

> Date: Fri, 3 Sep 2021 20:51:22 +0000
> Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
> From: Alan Mackenzie <acm@muc.de>
> 
> OK, I've hacked up a trial implementation, though I haven't started
> testing it yet.  The key is to extract jit-lock--fontify-now-1 from
> jit-lock-fontify-now, and have it call itself recursively to handle the
> expansion of the region caused by a jit-lock-bounds returned by the
> second or later function.
> 
> This should be easy to test and verify as correct, yet the recursion
> should be invoked rarely enough that it won't lead to inefficiencies.
> 
> This implementation should resolve Eli's concerns about handling two
> or more "first" functions in jit-lock-functions.

Thanks.