http://bugs.winehq.org/show_bug.cgi?id=30057
--- Comment #38 from Dmitry Timoshkov dmitry@baikal.ru 2012-03-14 23:10:38 CDT --- (In reply to comment #37)
XI2 provides the raw mouse data as XGenericEventCookie's data.raw_values, while If what Peter H says is correct this is a bugfix rather than a regression, meaning it will never be changed back.
This just means that with that "bugfix" they have broken all existing applications including just released Wine 1.4. Really nice of them.