code: def set_cursor(self, cursor):
      # docstring inherited
      window = self.get_property("window")
      if window is not None:
          window.set_cursor(_mpl_to_gtk_cursor(cursor))
          context = GLib.MainContext.default()
          context.iteration(True)
  
imports: import functools
  import logging
  import os
  from pathlib import Path
  import matplotlib
  from matplotlib import _api, backend_tools, cbook
  from matplotlib.backend_bases import ToolContainerBase, CloseEvent, KeyEvent, LocationEvent, MouseEvent, ResizeEvent
  from gi.repository import Gio, GLib, GObject, Gtk, Gdk
  from .None import _backend_gtk
  from ._backend_gtk import _BackendGTK, _FigureCanvasGTK, _FigureManagerGTK, _NavigationToolbar2GTK, TimerGTK
label_desc: Use image node_id 3 for calling the FigureCanvasGTK3 obj's underlying member method code with example usage: obj.set_cursor(cursor) without return types