\Recent flag in IMAP

If I read in a message via IMAP that has its \Recent flag set, and then
try to change other flags via Message.setFlags (or Message.setFlag), I
get a MessagingException which complains about trying to set the \Recent
flag.  The problem appears to be that after merging in the new flag
values, gnu.mail.profiders.imap.IMAPMessage.setFlags does not ignore the
\Recent flag when sending the updated flags to the IMAP server.
 
Note that according to the IMAP specification, the \Recent flag is not
a legal argument to the STORE or APPEND commands (section 2.3.2 of RFC
3501).
 
Thanks,
Bob Mitchell.