use new double-date sorting in non-default sorting modes

classes/feeds.php

@@ -871,25 +871,25 @@ class Feeds extends Handler_Protected {
 		switch ($order_by) {
 			case "date":
 				if (get_pref($this->link, 'REVERSE_HEADLINES', $owner_uid)) {
-					$override_order = "$date_sort_field";
+					$override_order = "$date_sort_field, updated";
 				} else {
-					$override_order = "$date_sort_field DESC";
+					$override_order = "$date_sort_field DESC, updated DESC";
 				}
 				break;
 
 			case "title":
 				if (get_pref($this->link, 'REVERSE_HEADLINES', $owner_uid)) {
-					$override_order = "title DESC, $date_sort_field";
+					$override_order = "title DESC, $date_sort_field, updated";
 				} else {
-					$override_order = "title, $date_sort_field DESC";
+					$override_order = "title, $date_sort_field DESC, updated DESC";
 				}
 				break;
 
 			case "score":
 				if (get_pref($this->link, 'REVERSE_HEADLINES', $owner_uid)) {
-					$override_order = "score, $date_sort_field";
+					$override_order = "score, $date_sort_field, updated";
 				} else {
-					$override_order = "score DESC, $date_sort_field DESC";
+					$override_order = "score DESC, $date_sort_field DESC, updated DESC";
 				}
 				break;
 		}