[Bug 31604] New: Steam: Windows can not be closed, they are always opened again (regression)

http://bugs.winehq.org/show_bug.cgi?id=31604

Bug #: 31604
           Summary: Steam: Windows can not be closed, they are always
                    opened again (regression)
           Product: Wine
           Version: 1.5.12
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: user32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
                CC: [e-mail]
    Classification: Unclassified
   Regression SHA1: d35fc4369fd9eb7e5fca78cc0d61e241de286ee0

Using wine 1.5.12, closing a window in Steam immediately re-opens the window. I
have not used Steam with wine for more than a year, and remember that the bug
was already present back then, but according to this bug it was fixed in the
mean time:
http://bugs.winehq.org/show_bug.cgi?id=23872

And indeed, going back to wine 1.5.11 fixed the problem. I did a regression
test, with the following result:

d35fc4369fd9eb7e5fca78cc0d61e241de286ee0 is the first bad commit
commit d35fc4369fd9eb7e5fca78cc0d61e241de286ee0
Author: Alexandre Julliard 
Date:   Wed Aug 29 18:08:37 2012 +0200

user32: Always go through set_window_pos when the WS_VISIBLE style is
changed.

:040000 040000 2181c83f9671eb18ffb3538e627cce5d2b0bf7e0
cdf5240aa47f26a98421467c50979a84b60c68e7 M      dlls

I verified that reverting this commit indeed fixes the problem.