code: def focusOutEvent(self, ev):
      text = self.toPlainText()
      if text != self.lastText:
          self.lastText = text
          self.on_update()
      super().focusOutEvent(ev)
  
imports: import numpy
  from ...graphicsItems.LinearRegionItem import LinearRegionItem
  from ...Qt import QtCore, QtWidgets
  from ...widgets.TreeWidget import TreeWidget
  from ..Node import Node
  from .None import functions
  from .common import CtrlNode
label_desc: Use image node_id 2 for calling the TextEdit obj's underlying member method code with example usage: obj.focusOutEvent(ev) without return types