[Imap-protocol] LIST response with trailing hierarchy character

[Bill Shannon]

Mark Crispin wrote:
> On Fri, 30 Mar 2007, Bill Shannon wrote:
>> Is the last untagged LIST response below valid?
>> A2 LIST "" "%"
>> [snip]
>> * LIST (\Noselect) "/" "Public Folders/"
>> A2 OK LIST completed.
> 
> I would say "no".

Ok, good, that's what I thought.

> UW imapd can return such a LIST result, but only from a pattern ending 
> with "/%".  For example:
> 
>     tag list "" barter/%
>     * LIST (\NoSelect) "/" barter/
>     * LIST (\NoInferiors \Marked) "/" barter/fred
>     * LIST (\NoInferiors \Marked) "/" barter/joe
>     * LIST (\NoInferiors \UnMarked) "/" barter/pete
>     tag OK LIST completed
> 
> This is because % is defined to match zero or more characters.

Which I understand, and I handle that case.

> My guess is that the author of server that did the bad thing did 
> empirical testing of UW imapd and misinterpreted what s/he saw.

It seems like quite a leap from what UW imapd does to this.

I think it's more likely because "Public Folders/" is a namespace,
which as I previously learned is a reasonable response to the
NAMESPACE command.  It just doesn't make sense here.

Looks like time for another bug workaround...