416                 if prev is None:

   416                 if prev is None:

   417                     dump_end = max(-1, count - 10)

   417                     dump_end = max(-1, count - 10)

   418                     oldest_message = (-1, None)

   418                     oldest_message = (-1, None)

   419                 else:

   419                 else:

   420                     dump_end = prev - 1

   420                     dump_end = prev - 1

   422                     new_message = self.GetLogMessageFromSource(msgidx, level)

   422                     new_message = self.GetLogMessageFromSource(msgidx, level)

   423                     if new_message is None:

   423                     if new_message is None:

   424                         if prev is None:

   424                         if prev is None:

   425                             oldest_message = (-1, None)

   425                             oldest_message = (-1, None)

   426                         break

   426                         break