Encoding & External editor (SVN_EDITOR)

Hello.

http://svn.collab.net/repos/svn/tags/1.1.3/subversion/clients/cmdline/util.c

#line 532:
      /* Use the external edit to get a log message. */
      err = svn_cl__edit_externally (&msg_string, &lmb->tmpfile_left,
                                     lmb->editor_cmd, lmb->base_dir,
                                     msg_string, "svn-commit",
                                     lmb->config, TRUE, NULL, pool);

Why 9th argument (const char *encoding) is NULL? What about lmb->message_encoding?

--
Alexander