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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: What's the best (i.e. least bad) way to re-redisplay?
Date: Mon, 23 Aug 2021 22:57:28 +0300
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In-Reply-To: <83fsv0vts5.fsf@gnu.org> (message from Eli Zaretskii on Mon, 23
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> Date: Mon, 23 Aug 2021 22:35:22 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> Why not simply call a one-time timer function that runs
> jit-lock-force-redisplay, when you decide that you need to refontify?
> jit-lock.el already does that in some cases.

Btw, you could try making it so your fontification function arrange
for jit-lock to call jit-lock-force-redisplay via its return value and
the jit-lock-bounds thingy.