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Re: What's the best (i.e. least bad) way to re-redisplay?

From: Alan Mackenzie
Subject: Re: What's the best (i.e. least bad) way to re-redisplay?
Date: Wed, 25 Aug 2021 20:09:24 +0000

Hello, Stefan.

On Tue, Aug 24, 2021 at 18:43:04 -0400, Stefan Monnier wrote:
> > The problem is, there will be occurences in the foreground window before
> > the one which triggered the fontification.  Redisplay will already have
> > passed this earlier buffer position.  So I need to trigger another
> > redisplay immediately after the current one.

> > What is the least bad way of doing this?

> I think something along the lines of

>     (run-with-timer 0 nil
>                     (lambda (buf)
>                       (with-current-buffer buf (font-lock-flush)))
>                     (current-buffer))

> is the cleanest that comes to mind.

Thanks.  That's probably cleaner than a direct use of
jit-lock-force-redisplay.  I'll just need to add BEG and END into that,
somehow, but font-lock-flush has these as &optional parameters, so that
won't be a problem.

But, looking at the code, font-lock-flush works by clearing the
'fontified property, nothing more.  This won't always trigger a
redisplay, will it?  Doesn't it need after-change-functions to be active
at the time?  Maybe after-change-functions will always be active during
a redisplay (and hence immediately after redisplay completes), but my
head's beginning to hurt.

>         Stefan
Alan Mackenzie (Nuremberg, Germany).

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