NSTextView - supplying word completions for insertion point?

FROM : Jim Correia
DATE : Tue Aug 29 22:39:01 2006

I have a text view in for which I'd like to offer a small number of 
completions for. I'm currently supplying these via the appropriate 
delegate method.

What I would like to do in addition is offer up all of the possibly 
completions (there aren't that many) when the user tries to 
"complete" an insertion point.

NSTextView appears to go backwards to the next word boundary (over 
whitespace) which is undesirable, but a simple override can correct 
that.

However, if I return a 0 length range from -rangeForUserCompletion, 
the completions are never triggered. The documentation is explicit 
that I should "Returning (NSNotFound, 0) suppresses completion." How 
can I convince NSTextView that it should offer up a list of 
completions for an empty completion range?

Thanks,
Jim