code: def trigger_manager_draw(manager):
      manager.canvas.draw_idle()
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  from contextlib import contextmanager
  import errno
  import json
  import os
  import random
  import sys
  import signal
  import socket
  import threading
  import tornado.web
  import tornado.ioloop
  import tornado.websocket
  from matplotlib import rcParams
  from matplotlib.backend_bases import _Backend
  from matplotlib._pylab_helpers import Gcf
  from .None import backend_webagg_core
  from .backend_webagg_core import TimerTornado
label_desc: Use image node_id 1 for calling the _BackendWebAgg obj's underlying member method code with example usage: obj.trigger_manager_draw(manager) without return types