[Bug 7512] Problem with unicode comboboxes

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=7512

------- Additional Comments From [e-mail]  2007-19-07 13:59 -------
It seems the CallWindowProc[AW] has also such a protection for builtin winprocs
- the following test passes:

WCHAR uni[] = {0x142, 0x40e, 0x3b4, 0};
    hTestWnd = CreateWindowW(WC_EDITW, uni, WS_OVERLAPPEDWINDOW, 
      CW_USEDEFAULT, CW_USEDEFAULT, 680, 260, NULL, NULL, NULL, 0);
    CallWindowProcW(GetWindowLongPtrA(hTestWnd, GWLP_WNDPROC), hTestWnd,
WM_GETTEXT, 120, buf);
    ok(memcmp(buf, uni, sizeof(uni)) == 0, "WM_GETTEXT invalid return\n");
    DestroyWindow(hTestWnd);

Such a test for a custom winproc provided by a program fails.