Re: Major modes using `widen' is a good, even essential, programming practice.

[Eli Zaretskii]

> Date: Mon, 8 Aug 2022 10:38:36 +0000
> Cc: Gregory Heytings <gregory@heytings.org>, emacs-devel@gnu.org
> From: Alan Mackenzie <acm@muc.de>
> 
> It's also worth pointing out that _looking_ at text, whatever that means
> exactly, is an order of magnitude faster than _fontifying_ that text.

I'm quite sure this is not why major modes (and CC Mode in particular)
widen.  They must do something entirely non-trivial at BOB.