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Re: Bug in font-lock-syntactic-keywords handling?

From: Stefan Monnier
Subject: Re: Bug in font-lock-syntactic-keywords handling?
Date: Mon, 06 Oct 2014 09:14:21 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

> As you can see, for the third iteration start moves back to the
> beginning of the second chunk and it tries to re-propertize it without
> unfontifying which causes an bug in lua-mode's syntactic keyword
> handling. I do know that I (ab-)used a deprecated variable to maintain
> compatibility with Emacs23 and using `syntax-propertize-function`
> should fix that for Emacs24, but I'd be grateful if anyone pointed me
> to a simple fix for Emacs23.

That seems like a performance bug (it re-fontifies something that's
already been fontified), indeed, but I don't see why that would cause
something to "fail".

If it really causes a failure, I suspect that the failure is really
caused by an underlying bug in the specific syntactic-keywords rules,
which merely gets triggered by this performance bug.


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