Using wrong variable here.

diff --git a/imp/mailbox-mimp.php b/imp/mailbox-mimp.php
index 87f3fd3..4f23024 100644 (file)
--- a/imp/mailbox-mimp.php
+++ b/imp/mailbox-mimp.php
@@ -235,7 +235,7 @@ foreach ($hdr_list as $key => $val) {
 }
 
 /* Add thread header entry. */
-if (!$search_mbox && IMP::threadSortAvailable($mailbox)) {
+if (!$search_mbox && IMP::threadSortAvailable(IMP::$mailbox)) {
     if (is_null($imp_thread)) {
         $t->set('hdr_subject_minor', $t->get('hdr_thread'));
     } else {