[Tickets #3557] Virtual Shared Folders are not shown

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Ticket URL: http://bugs.horde.org/ticket/?id=3557
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 Ticket             | 3557
 Updated By         | Michael Slusarz <slusarz at mail.curecanti.org>
 Summary            | Virtual Shared Folders are not shown
 Queue              | IMP
 Version            | 4.1-RC3
 State              | Feedback
 Priority           | 2. Medium
 Type               | Bug
 Owners             | Michael Slusarz
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Michael Slusarz <slusarz at mail.curecanti.org> (2006-03-28 14:19) wrote:

According to RFC 3501 [6.3.8]:
      Server implementations are permitted to "hide" otherwise
      accessible mailboxes from the wildcard characters, by preventing
      certain characters or names from matching a wildcard in certain
      situations.  For example, a UNIX-based server might restrict the
      interpretation of "*" so that an initial "/" character does not
      match.

*Not* a big fan of this at all.  There is no way to determine, for example,
when a server is going to disregard a wildcard character (technically
speaking, an IMAP server could have its wildcards ignore the letter 'a', for
example, which completely goes against the idea of a wildcard.)

Apparently, some servers (Courier IMAP seems to be a culprit) don't
advertise their shared folders when doing a 'LIST "" "*"' command on the
server.  Thus, we need to go through all namespaces and do a wildcard search
on each one.  Unfortunately, this will cause duplicative IMAP searches on
many IMAP servers (e.g., listing namespace '' and then listing namespace
'shared.') but I guess there is no way around it.