docs: def _first_line_handler(self, data, search_pattern):
          """
          In certain situations the first line will get repainted which causes a false
          match on the terminating pattern.
  
          Filter this out.
  
          returns a tuple of (data, first_line_processed)
  
          Where data is the original data potentially with the first line modified
          and the first_line_processed is a flag indicating that we have handled the
          first line.
          """
          try:
              # First line is the echo line containing the command. In certain situations
              # it gets repainted and needs filtered
              lines = data.split(self.RETURN)
              first_line = lines[0]
              if BACKSPACE_CHAR in first_line:
                  pattern = search_pattern + r".*$"
                  first_line = re.sub(pattern, repl="", string=first_line)
                  lines[0] = first_line
                  data = self.RETURN.join(lines)
              return (data, True)
          except IndexError:
              return (data, False)