[Bug 1240] New: - Nullsoft Installer has bad child window style on first screen

http://bugs.winehq.com/show_bug.cgi?id=1240

Summary: Nullsoft Installer has bad child window style on first
                    screen
           Product: Wine
           Version: CVS
          Platform: PC
               URL: http://theoretic.com/mike/nsis-corruption.png
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-user
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

As shown in the URL image, what should be an invisible child window has the
WS_CAPTION style set.

trace:win:CreateWindowExW classname=#8002  stylehex=40c00440
trace:win:WIN_CreateWindowEx L"" L"#32770" ex=00000000 style=40c00440 -3,-22
456x253 parent=0x10021 menu=(nil) inst=0x400000 params=(nil)
trace:win:WIN_CreateWindowEx Styles before adjustment:
trace:win:dump_window_styles style: WS_CHILD WS_CAPTION 00000440
trace:win:dump_window_styles exstyle:
trace:win:WIN_CreateWindowEx winproc type is 3 (WIN_PROC_32W)
trace:class:CLASS_FindClassByAtom 0x00008002 0x400000
trace:class:CLASS_FindClassByAtom -- found global 0x40388118
0807a218:Call ntdll.RtlAllocateHeap(40360000,00000000,000000a2) ret=408be1fd
0807a218:Ret  ntdll.RtlAllocateHeap() retval=403a0458 ret=408be1fd
trace:win:WIN_CreateWindowEx Styles after adjustment:
trace:win:dump_window_styles style: WS_CHILD WS_CAPTION 00000440
trace:win:dump_window_styles exstyle: WS_EX_WINDOWEDGE
trace:win:WIN_SetWindowLong 0x1002f -12 0 3
0807a218:Call x11drv.CreateWindow(0001002f,406b2884,00000001) ret=408bfffc

The app I'm testing with is at http://rhymbox.com/download/start.pl

The installer itself appears to set the WS_CAPTION flag when calling
CreateWindowEx. In Windows, spy++ shows that this flag isn't set, but the usage
of vc++ lazy bindings mean I can't get an API trace under windows :(

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