if the layout policy is STRETCH. It would probably also make sense to
make them work with EQUALIZE, but that would require a few more changes.
(If the maximum width component had a weight of 2 you could set the
baseline width to half that.)
git-svn-id: https://samskivert.googlecode.com/svn/trunk@1713 6335cc39-0255-0410-8fd6-9bcaacd3b74c