http://bugs.winehq.org/show_bug.cgi?id=24579
--- Comment #33 from Alexey Loukianov mooroon2@mail.ru 2011-09-10 19:08:10 CDT --- Well, Steam window moving is still buggy with Wine 1.3.28.
Also I can confirm that the Steam behavior under 1.3.28 is pretty much the same as described in comment #28. I think that it might be related to the fact that Steam works much more slowly (laggy) under recent Wine versions, and it somehow causes its event loop to miss mouse up handler and to "stuck" into "window drag mode". Steam lagging heavily is a subject for another bug - namely bug #19889. I bet that as soon as heavy lagging problem would be fixed it would either return-back double-range jump on windo move behavior or would finally fix this bug.