> Second, this breaks function font-latex-jit-lock-force-redisplay in
> auctex, which uses the old prototype. This is present in emacs and
> auctex from trunk. Is the prototype change really necessary? If no, this
> is a bug for emacs, if yes, this is a bug for auctex. In doubt, I'm
> submitting the report in both.
The answer is that font-latex should not modify
font-lock-fontify-region-function and should instead use
font-lock-extend-region-functions (it's OK to do what it does when
running on older Emacsen which do not have
font-lock-extend-region-functions, of course).
Stefan
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