font-lock-add-keywords in outline-mode

[Sebastian Tennant]

Hi all,

When I eval

 (font-lock-add-keywords nil '("<regexp>" . font-lock-variable-name-face))

in a buffer in outline mode, the pattern matched by the <regexp> is
highlighted as intended, but outline-mode's headers; for example:

** test data 

are no longer highlighted.

Presumably this is because the <regexp> I've added somehow overides
the regexp for the outline headers ("^\\*.*" maybe).

Is there an easy way to avoid this and still use the handy
font-lock-add-keyowrds function?

Sebastian