code: def maxline(filename, use_cache_only=False):
      
      if filename not in file2file_remap_lines:
          return size(filename, use_cache_only)
      max_lineno = -1
      remap_line_entry = file2file_remap_lines.get(filename)
      if not remap_line_entry:
          return size(filename, use_cache_only)
      for t in remap_line_entry.from_to_pairs:
          max_lineno = max(max_lineno, t[1])
      if max_lineno == -1:
          return size(filename, use_cache_only)
      else:
          return max_lineno
docs: Return the maximum line number filename after taking into account
      line remapping. If no remapping then this is the same as size