void gtk_drag_dest_set_proxy ( GtkWidget* widget, GdkWindow* proxy_window, GdkDragProtocol protocol, gboolean use_coordinates )
Sets this widget as a proxy for drops to another window.
Please do not use it in newly written code.
The window to which to forward drag events.
The data is owned by the caller of the function.
The drag protocol which the
proxy_windowaccepts (You can use
gdk_drag_get_protocol()to determine this)
TRUE, send the same coordinates to the destination, because it is an embedded subwindow.