When the maximize is triggered by Qt, we get the WM_GETMINMAXINFO
too soon, as QWindow already says it's maximized, while it's still
in process of being.
Just removed the condition, doesn't seem to have any bad side-effect
When we cover the native title bar and maximize the window, it won't
appear at 0,0, but at -5, -5 or so.
Use Windows native maximize instead, which works fine
