[Bug-AUCTeX] 2008-05-30; highlighting of \citep[][]{} commands

[emacs user]

hi,

when using natbib, \citep{} and \citep[]{} are nicely highlighted.
but \citep[][]{} which is a legitimate form is not highlighted.


Emacs  : GNU Emacs 23.0.60.1 (i386-apple-darwin9.2.2, *Step 9.0rc3)
 of 2008-05-27 on xx
Package: 2008-05-30

current state:
==============
(setq
 AUCTeX-date "2008-05-30"

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