Find window given position, search front-to-back - Typically write output back to g.HoveredWindow and g.HoveredWindowUnderMovingWindow. - FIXME: Note that we have an inconsequential lag here: OuterRectClipped is updated in Begin(), so windows moved programmatically with SetWindowPos() and not SetNextWindowPos() will have that rectangle lagging by a frame at the time FindHoveredWindow() is called,