imap folders missing when mixing dovecot with gmail

Hello,

I found a bug when I mixed Dovecot as primary account with Gmail as identity account: folders from Gmail are missing. (also from Synology MailPlus).

After a little research I found in session the following variables:

Bad setup for Gmail folders:

[imap_namespace] => Array
        (
            [personal] => Array
                (
                    [0] => Array
                        (
                            [0] => INBOX.
                            [1] => .
                        )

                )

            [other] => 
            [shared] => 
            [prefix_in] => INBOX.
            [prefix_out] => INBOX.
        )

    [imap_list_conf] => Array
        (
            [0] => INBOX.
            [1] => Array
                (
                )

        )

‌

Good setup for Gmail folders:

‌

    [imap_namespace] => Array
        (
            [personal] => Array
                (
                    [0] => Array
                        (
                            [0] => 
                            [1] => /
                        )

                )

            [other] => 
            [shared] => 
            [prefix_out] => 
        )

    [imap_delimiter] => /
    [imap_list_conf] => Array
        (
            [0] => 
            [1] => Array
                (
                )

        )

‌

These variables are not changing after identity change, maybe they need to be preserved and restored.

So my dirty fix was to add into file ident_switch.php at line 737 ( in function on_switch() after $_SESSION['iid' . self::MY_POSTFIX] = $r['iid'];)

$_SESSION['imap_namespace']="";
$_SESSION['imap_namespace']=array();
$_SESSION['imap_list_conf']="";
$_SESSION['imap_list_conf']=array();

‌

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