[Windows] setFlag() call removes maximized information from window

When you call setFlag(Qt::WindowStaysOnTopHint, true for a maximized window the window looses the maximized information.

The attached example can be used to reproduce the issue. First make the window maximized and then click on the window. This will set the WindowStaysOnTopHint flag to true. As a result, the window no longer is maximized.

To demonstrate this, another click on the window sets the WindowStaysOnTopHint flag to false and the window no longer is maximized.

It seems void WindowCreationData::applyWindowFlags(HWND hwnd) keeps the enabled and visible information from the current style. Should it do the same for the minimized and maximized information?