Embeding XWindow in Gtk.DrawingArea

#!/usr/bin/python3

from gi.repository import Gtk, Gdk, GdkX11

WIDTH = 800
HEIGHT = 600

drawing_area = Gtk.DrawingArea()
drawing_area.set_size_request(WIDTH, HEIGHT)
drawing_area.add_events(Gdk.EventMask.ALL_EVENTS_MASK)
drawing_area.set_double_buffered(False)
drawing_area.realize()

window = Gtk.Window()
window.add(drawing_area)

window.connect('delete-event', Gtk.main_quit)
window.show_all()

# Just for sure
drawing_area.get_window().resize(WIDTH, HEIGHT)

xid = drawing_area.get_window().get_xid()
print('export LIBSOY_X11_WID=%s' % xid)

Gtk.main()