code: def simplify_textboxes(miner, textbox_getter):
      
      for box in textbox_getter(miner):
          first_line = box._objs[0]
          first_char = first_line._objs[0]
  
          visible = first_char.rendermode != 3
          corrupt = first_char.get_text() == '\ufffd'
          yield TextboxInfo(box.bbox, visible, corrupt)
docs: Extract only limited content from text boxes
  
      We do this to save memory and ensure that our objects are pickleable.