code: def rectangles(
      self, istart, istop=None, workers=None, start_boundary=0
  ):
      msgs = []
      diff = self.index - len(self.buffer)
      if istop is None:
          istop = self.index
      for i in range(
          max(0, (istart or 0) - diff), istop - diff if istop else istop
      ):
          msg = self.buffer[i]
          msgs.append(msg)
  
      return rectangles(
          msgs, workers=workers, start_boundary=start_boundary
      )
  
file_path: distributed/distributed/diagnostics/task_stream.py
imports: from __future__ import annotations
  import logging
  from collections import deque
  import dask
  from dask.utils import format_time, key_split, parse_timedelta
  from distributed.diagnostics.plugin import SchedulerPlugin
  from distributed.diagnostics.progress_stream import color_of
  from distributed.metrics import time
label_desc: Use image node_id 4 for calling the TaskStreamPlugin obj's underlying member method code with example usage: obj.rectangles(istart, istop, workers, start_boundary) and returns: rectangles