bug#57207: 29.0.50; Fontification is slow after e7b5912b23 (Improvements to long lines handling)

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> Ah, I know what's causing this: flyspell calls redisplay (via sit-for)
> inside its post-command-hook.
>
> So I think this basically means we cannot narrow the buffer while
> calling pre- and post-command-hooks, because any of them can trigger
> redisplay, and that will show "Narrow" on the mode line.

Would binding `inhibit-redisplay' there help?