On Sun, Apr 14, 2013 at 2:20 AM, Stefan Monnier <monnier@iro.umontreal.ca>wrote:

> > It crossed my mind, but I didn't like the idea, as it also removes
> > "good" fortification.  I suppose this could be of little consequence.
>
> I don't know what you mean by "removes good fontification".
>
>
>         Stefan
>

Actually you've said it in a comment:

(remove-overlays start end 'nlinum t)
;; Warn jit-lock that this part of the buffer is not done any
;; more.  This has the downside that font-lock will be re-applied
;; as well.  But jit-lock doesn't know how to (and doesn't want
;; to) keep track of the status of its various
;; clients independently.
(put-text-property start end 'fontified nil)

Evgeni