Fixes test failure on FF2 with a bit of a hack in the test (FF2 has an
off-by-one error in getBoxObjectFor() that cannot easily be fixed).
TBR: jlabanca


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@5492 8db76d5a-ed1c-0410-87a9-c151d255dfc7