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From: Raffaele Ricciardi <rfflrccrd@gmail.com>
Newsgroups: gmane.emacs.help
Subject: Re: font-lock-keywords: matcher function not working
Date: Sat, 29 Jun 2013 15:32:45 +0200
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On 29/06/13 10:53, Raffaele Ricciardi wrote:
> However, unless I restart `lisp-interaction-mode', no highlighting occurs,
> neither it does if I just restart `font-lock-mode'.  Why is it so?  I
> was expecting
> `font-lock-fontify-buffer' to apply the new rules.

Meanwhile, for those who are interested, I've discovered that
`font-lock-fontify-buffer' applies immediately any new rules applied to the
current buffer only.  Therefore, while experimenting, you can use for 
example:

(font-lock-add-keywords nil
                         '(
                           ("^[[:blank:]]*\\((\\)" 1 
'font-lock-warning-face)
                           ))

instead of:

(font-lock-add-keywords 'lisp-interaction-mode
                         '(
                           ("^[[:blank:]]*\\((\\)" 1 
'font-lock-warning-face)
                           ))

and then call `font-lock-fontify-buffer' to see the effect.  Of course, 
do not forget to
call `font-lock-remove-keywords' on the old rules, first.