nnmail split multi-byte bug or feature?

[stormwatch]

Note: It seems that the original message sent thorugh
news.individual.net was not delivered.

I did set this nnmail split method
("mail.utn.campusvirtual.\\1" "^X-Course-Name: \\(.*\\)$")

The problem is that the matched text is multi-byte encoded. Setting
(setq nnmail-mail-splitting-decodes t) did the trick. Well, almost,
because the group name shown in the *Group* buffer is:

28: mail.utn.campusvirtual.ingenier\355a y sociedad

instead of:

28: mail.utn.campusvirtual.ingeniería y sociedad

The dir '/home/stormwatch/Mail/mail/utn/campusvirtual/ingeniería y
sociedad' was created by gnus but I could not view the summary of the
group; not until I created a symlink with a latin-1 encoded dirname by
means of convmv:

david :: mail/utn/campusvirtual » ls -l
total 4
lrwxrwxrwx 1 stormwatch stormwatch   22 jul 22 05:09 ingenier?a y
sociedad -> ingeniería y sociedad
drwxrwxr-x 2 stormwatch stormwatch 4096 jul 22 05:19 ingeniería y
sociedad

My locale is utf-8 (LANG=es_AR.UTF-8)

--
Ezequiel Birman