http://bugs.winehq.org/show_bug.cgi?id=17163
--- Comment #2 from Dylan Smith dylan.ah.smith@gmail.com 2009-01-28 08:18:25 --- (In reply to comment #1)
Sent a patch to wine-patches that seems to fix the bug: richedit: Suppress scrollbar if missing WS_[VH]SCROLL style. http://www.winehq.org/pipermail/wine-patches/2009-January/068491.html
The patch has just been accepted in to the main git tree as commit a051a231190a0b76887a8f90a00d41b54ac703d5
It should be fixed in git. could you re-test and make sure.