Before we leap into adding code into the highlighter though I think it's worth considering what we are trying to fix here in a more general sense.
As a basic principle I think highlighting should attempt to show the user what the search engine saw as important in the document.
With that principle in mind I should really make sure that if I search for:
("Doug Cutting" AND lucene) OR google
I shouldn't highlight "Doug Cutting" in a matching document that has google but not lucene.
Shouldn't the search code already take care of that? That said, for a document that contains both "Doug Cutting loves Lucene" and "Doug Cutting loves Google", ideally a highlighter should prefer "Doug Cutting loves Google". The query should thus be compared to each potential highlight fragment. This evaluation is different than the whole-document evaluation performed by search. If no fragments match the entire query, then fragments should be selected which, considered together, match the entire query.
Doug
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