class_docstr: Determines the most recently run cell in the notebook.
  
  Needed to keep track of which demo the user is updating.
code: def __init__(self, ipython):
      ipython.events.register("pre_run_cell", self.pre_run_cell)
      self.shell = ipython
      self.current_cell: str = ""
  
file_path: gradio/gradio/ipython_ext.py
imports: import gradio
  from gradio.networking import App
  from gradio.utils import BaseReloader
label_desc: Use image node_id 1 to create a new CellIdTracker object  with example: obj = CellIdTracker(ipython)