Ticket #32651: patch.diff

trunk/wp-includes/link-template.php

@@ -1571 +1571 @@
         }
 
         $adjacent = $previous ? 'previous' : 'next';
-        $op = $previous ? '<' : '>';
+        $op = $previous ? '<=' : '>=';
         $order = $previous ? 'DESC' : 'ASC';
 
         /**
@@ -1600 +1600 @@
          * @param bool   $in_same_term   Whether post should be in a same taxonomy term.
          * @param array  $excluded_terms Array of excluded term IDs.
          */
-        $where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare( "WHERE p.post_date $op %s AND p.post_type = %s $where", $current_post_date, $post->post_type ), $in_same_term, $excluded_terms );
+        $where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare( "WHERE p.post_date $op %s AND p.ID != %d AND p.post_type = %s $where", $current_post_date, $post->ID, $post->post_type ), $in_same_term, $excluded_terms );
 
         /**
          * Filter the ORDER BY clause in the SQL for an adjacent post query.
@@ -1612 +1612 @@
          *
          * @param string $order_by The `ORDER BY` clause in the SQL.
          */
-        $sort  = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" );
+        $sort  = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order, p.ID $order LIMIT 1" );
 
         $query = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort";
         $query_key = 'adjacent_post_' . md5( $query );