[Interest] X11: Set _NET_WM_WINDOW_TYPE to _NET_WM_WINDOW_TYPE_DOCK for QQmlApplicationEngine-based application

[Mikhail Khvoinitsky]

For QWidget-based app there was Qt::WA_X11NetWmWindowTypeDock
WidgetAttribute flag. When I try to set property manually using
libX11.so, Qt instantly overwrites the property. Any suggestions?
Thanks.