don't STATUS a mailbox that isn't selectable

functions/imap_mailbox.php

@@ -795,7 +795,9 @@ function sqimap_mailbox_tree($imap_stream) {
 	    if (($unseen_notify == 2 && $mbx == 'INBOX') 
 		|| $unseen_notify == 3 
 		|| ($move_to_trash && ($mbx == $trash_folder))) {
-    		$sorted_lsub_ary[$i]['unseen'] = sqimap_unseen_messages($imap_stream, $mbx);
+    		$sorted_lsub_ary[$i]['unseen'] = 
+			$sorted_lsub_ary[$i]['noselect'] ?
+			    0 : sqimap_unseen_messages($imap_stream, $mbx);
 		if ($unseen_type == 2 || ($move_to_trash 
 		    && ($mbx == $trash_folder) )) {
         	    $sorted_lsub_ary[$i]['nummessages'] = sqimap_get_num_messages($imap_stream, $mbx);