https://bugs.winehq.org/show_bug.cgi?id=43577
--- Comment #9 from Fabian Maurer dark.shadow4@web.de --- (In reply to Zebediah Figura from comment #8)
I don't think it's a mistake—the application is requesting SetParent(...,NULL), and testing on Windows shows that a child window thus affected retains its WS_CHILD status.
Makes sense I guess. Anyways, the current code treats such windows wrong, would my way be acceptable?