code: def delayed_redraw(self):
          
  
          # This is the optimized redraw method
          with self._defer_lock:
              # pick up the lowest necessary level of redrawing
              whence = self._defer_whence
              self._defer_whence = self._defer_whence_reset
              flag = self._defer_flag
              self._defer_flag = False
  
          if flag:
              # If a redraw was scheduled, do it now
              self.redraw_now(whence=whence)
docs: Handle delayed redrawing of the canvas.