Subject: bug#56682: feature/improved-locked-narrowing 9dee6df39c: Reworked locked narrowing.

From: Gregory Heytings <[email-masked]>
Date: Tue, 31 Jan 2023 15:17:57 +0000

>
> note that a significant part of the redisplay slowdowns wasn't caused by 
> font-lock, and thus the removal of locking will not regress those 
> performance improvements.
>

That is correct.

>
> And for those (potential?) cases where font-lock is a real problem for 
> performance, we could stop it from widening using an existing knob.
>

That is not correct.  There is no knob that can prevent a mode from 
widening.