instead of using a buffer strategy. This will shortly be extended to
support more efficient scrolling as well.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1021 542714f4-19e9-0310-aa3c-eee0fc999fb1
paintImmediately() so that it can figure out if it's being painted solely
to facilitate scrolling or because there are dirty regions.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1010 542714f4-19e9-0310-aa3c-eee0fc999fb1