bug#56682: Fix the long lines font locking related slowdowns

[Eli Zaretskii]

> Date: Fri, 5 Aug 2022 15:19:45 +0300
> Cc: 56682@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>,
>  monnier@iro.umontreal.ca
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> On 05.08.2022 11:23, Gregory Heytings wrote:
> > No, because the point of considering extreme cases is that they reveal 
> > on your computer what happens on other people's less powerful computers 
> > with much smaller files.
> 
> The problem with considering extreme cases, however, is that one can 
> also provide an even more extreme case no matter how we optimize our 
> implementations, which, with the chosen approach, will force us to 
> cripple or drop most features outright.

The chosen approach does the same in a 10KB file and in 100GB file, so
I don't understand what you have in mind here.