Changes have been made in Git (master):

commit d1bfcec37a434fb9a66e9f1f2686ae7b034de2df
Author: Moritz Venn <ritzmo@php.net>
Date:   Thu Jul 12 20:25:50 2007 +0000

     Implement #8503, thanks Brian


     git-svn-id: 
https://svn.php.net/repository/pear/packages/Text_Wiki/trunk@239632 
c90b9560-bf6c-de11-be94-00142212c4b1

  Text/Wiki/Mediawiki.php               |  1 +
  Text/Wiki/Parse/Mediawiki/Comment.php | 59 
+++++++++++++++++++++++++++++++++++
  2 files changed, 60 insertions(+)

http://github.com/horde/horde/commit/d1bfcec37a434fb9a66e9f1f2686ae7b034de2df

No, this is working fine.  An attachment is any part that isn't 
displayed inline (e.g. that can not be displayed in the body).  For 
example, things like images won't appear in the attachment list since 
they are represented in the body of the message (this is consistent 
with the way most other mail clients work).



I can confirm that files attached as application/octet-stream, for 
example, are properly shown in the summary list.



On further review, the 'none' option to the parts_display pref should 
really never be selected.  I will remove this option.

There are 3 options for attachment view: all parts, only attachments 
and none. The first and the last options are working, the second one 
do not show anything.