GtkWidgetdrag_dest_set_proxy

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.

`proxy_window`	`GdkWindow`
	The window to which to forward drag events.
	The data is owned by the caller of the function.
`protocol`	`GdkDragProtocol`
	The drag protocol which the `proxy_window` accepts (You can use `gdk_drag_get_protocol()` to determine this)
`use_coordinates`	`gboolean`
	If `TRUE`, send the same coordinates to the destination, because it is an embedded subwindow.