An NSMatrix with its selection mode set to NSListModeMatrix seems to, if
there's no other selection, automatically select its first cell whenever
a resize or scroll happens. I'd be very grateful if someone could tell
me how to get it to not do that.

"First, let me make it very clear, poor people aren't necessarily killers. Just
because you happen to be not rich doesn't mean you're willing to kill."
-- George W. Bush in Washington, D.C. on May 19, 2003