gdkDragFindWindow(object, drag.window, x.root, y.root)objectdrag.windowGdkWindow]  a window which may be at the pointer position, but
     should be ignored, since it is put up by the drag source as an icon.x.rooty.rootdest.windowGdkWindow]  location to store the destination window in.protocolGdkDragProtocol]  location to store the DND protocol in.dest.window and protocol parameters for gdkDragMotion.