Bug 4204: Apparently Mac OS X has drag offsets which are opposite in sign to what Windows uses. Augh!
Bug 4204: Apparently Mac OS X has drag offsets which are opposite in
sign to what Windows uses. Augh!

git-svn-id: 3948e88432e1a59e1cb2bc472f8f957688004121@8137 67b53d14-2c14-4ace-a08f-0dab2b34000c

ethaneldridge/vassal,ethaneldridge/vassal,ethaneldridge/vassal