http://bugs.winehq.org/show_bug.cgi?id=3532
--- Comment #9 from Andrew Talbot Andrew.Talbot@talbotville.com 2007-09-01 19:02:00 --- The patch that fixes this bug is commit ac98e0c07535af4a373c0af343498903e2ff42a6: "winex11: Switch windows to managed mode in SetWindowPos instead of at creation time."
I have determined that, with the associated app, the reported oscillations are clearly and consistently evident prior to this patch, but not subsequently.