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From: "rgb" <rbielaws@i1.net>
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Subject: Re: Multiline font lock questions
Date: 17 Nov 2006 09:02:28 -0800
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>    * Place a `font-lock-multiline' property on the construct when it is
>      added to the buffer.
>
> I don't understand how that can help.  If I start with
>
> +------------+
> |This [is    |
> |paragraph 1 |
> |            |
> |This is     |
> |paragraph] 2|
> +------------+
>
> then presumably nothing is marked with the `font-lock-multiline'
> property, because there are no multiline constructs.  If I then kill
> the blank line, how is it going to know to start identification at the
> beginning of the newly-formed paragraph?

Look at the SYNTAX-BEGIN argument of font-lock-defaults.