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

[Dmitry Gutov]

On 08.08.2022 14:30, Eli Zaretskii wrote:
> So if you dislike the current solution of locked narrowing, how about
> making syntax-ppss work in chunks (perhaps from an idle timer?), after
> initially scanning only the first small portion of the file.  The goal
> is to have the file displayed quickly enough, and thereafter complete
> the scan when possible.

The file is already displayed "quickly enough". The problem arrives when 
you try to navigate far from BOB (e.g. to EOB).

What's going to happen then, if the timer hasn't fired yet? And for the 
timer's work to be useful, it has to had happened between the last edit 
and the subsequent navigation. A lot of idle timers like that = a lot of 
discarded work.