Bug #3017 wrong Relay_Log_Pos if Rotate is in the middle of a transaction in relay log

Description:
See how-to-repeatR

How to repeat:
Run test rpl_trunc_binlog: result contains
  show slave status;
  Master_Host   Master_User     Master_Port     Connect_retry   Master_Log_File Read_Master_Log_Pos     Relay_Log_File        Relay_Log_Pos   Relay_Master_Log_File   Slave_IO_Running        Slave_SQL_Running       Replicate_do_db       Replicate_ignore_db     Last_errno      Last_error      Skip_counter    Exec_master_log_pos  Relay_log_space
! 127.0.0.1     root    MASTER_PORT     1       master-bin.002  4       slave-relay-bin.002     161     master-bin.001        Yes     No                      0       Rolling back unfinished transaction (no COMMIT or ROLLBACK) from relay log. Probably cause is that the master died while writing the transaction to it's binary log.0       79      #

Relay_log_pos==161 does not correspond to any position in the relay log. It should read "120", "160" or "201".

Suggested fix:
pushing a fix now...

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Additional info:

ChangeSet@1.1723, 2004-03-01 00:46:31+01:00, guilhem@mysql.com