Forgot that $lsub_ibx[0] would be unset if LSUB didn't return INBOX, so

it'd never run the LIST code.  This meant in the case where they weren't
subbed to their INBOX, it'd never appear.

Thanks shaug for helping spot that.

functions/imap_mailbox.php

@@ -731,15 +731,14 @@ function sqimap_mailbox_tree($imap_stream) {
 
         if ($has_inbox == false) {
             $lsub_ibx = sqimap_run_command( $imap_stream, "LSUB \"\" \"INBOX\"", true, $response, $message );
-            if (isset($lsub_ibx[0])) {
-                if (preg_match("/^\*\s+LSUB\s+(.*)\"?INBOX\"?[^(\/\.)].*$/",$lsub_ibx[0])) {
+            if (isset($lsub_ibx[0]) && (preg_match("/^\*\s+LSUB\s+(.*)\"?INBOX\"?[^(\/\.)].*$/",$lsub_ibx[0]))) {
+                $lsub_ary[] = $lsub_ibx[0];
+            } else {
+                $lsub_ibx = sqimap_run_command( $imap_stream, "LIST \"\" \"INBOX\"", true, $response, $message );
+                if (preg_match("/^\*\s+LIST\s+(.*)\"?INBOX\"?[^(\/\.)].*$/",$lsub_ibx[0])) {
+                    sqimap_run_command( $imap_stream, "SUBSCRIBE \"INBOX\"", true, $response, $message );
+                    $lsub_ibx[0] = str_replace("LIST","LSUB",$lsub_ibx[0]);
                     $lsub_ary[] = $lsub_ibx[0];
-                } else {
-                    $lsub_ibx = sqimap_run_command( $imap_stream, "LIST \"\" \"INBOX\"", true, $response, $message );
-                    if (preg_match("/^\*\s+LIST(.*)\"?INBOX\"?[^(\/\.)].*$/",$lsub_ibx[0])) {
-                        $lsub_ibx[0] = str_replace("LIST","LSUB",$lsub_ibx[0]);
-                        $lsub_ary[] = $lsub_ibx[0];
-                    }
                 }
             }
         }