Bug: Hi-lock-mode doesn't highlight regexp re-builder vets

[Denis Bueno]

In GNU Emacs 22.1.50.2 (i386-apple-darwin8.9.1, Carbon Version 1.6.0) of
2007-07-06:

    1. emacs -Q
    2. Paste into *scratch*:

    7/6 09:28:35
    7/6 09:30:34

    3. M-x re-builder
    4. 09[:]\\(\\(28\\)\\|\\(29\\)\\|\\(30\\)\\)
    5. Observe that both lines have matching parts.
    6. Kill the *re-builder* buffer.
    7. M-x hi-lock-mode
    (Observe that the minibuffer says "Hi-lock mode enabled" but "Hi" is not
displayed in the modeline.  That's weird.)
    8. C-x w h 09[:]\\(\\(28\\)\\|\\(29\\)\\|\\(30\\)\\) RET RET
    9. Observe no highlighting.
    (Also "Hi" is now in the modeline.)

Thank you.

-Denis