[Imap-protocol] Gmail LIST-EXTENDED bug

A Gmail IMAP protocol bug that was reported to me and has been verified.

Gmail supports LIST-EXTENDED, at least in the account I tested with.   
However, this command fails:

* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN  
X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE ENABLE MOVE CONDSTORE ESEARCH  
UTF8=ACCEPT LIST-EXTENDED LIST-STATUS
a OK [email protected] authenticated (Success)
b LIST () "" (*)
b BAD Could not parse command


This is a legal LIST command if LIST-EXTENDED is available, per RFC 5258:

    list =      "LIST" [SP list-select-opts] SP mailbox SP mbox-or-pat
                [SP list-return-opts]
    list-select-opts =  "(" [
                  (*(list-select-opt SP) list-select-base-opt
                   *(SP list-select-opt))
                / (list-select-independent-opt
                   *(SP list-select-independent-opt))
                ] ")"
                ; Any number of options may be in any order.
                ; If a list-select-mod-opt appears, then a
                ; list-select-base-opt must also appear.
                ; This allows these:
                ; ()
                ; (REMOTE)
                ; (SUBSCRIBED)
                ; (SUBSCRIBED REMOTE)
                ; (SUBSCRIBED RECURSIVEMATCH)
                ; (SUBSCRIBED REMOTE RECURSIVEMATCH)
                ; But does NOT allow these:
                ; (RECURSIVEMATCH)
                ; (REMOTE RECURSIVEMATCH)
    mbox-or-pat =  list-mailbox / patterns
    patterns =  "(" list-mailbox *(SP list-mailbox) ")"


michael

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