Ticket #15400: 15400-1-reduce-to-one-query-when-pagination-disabled.patch

wp-includes/default-widgets.php

@@ -650 +650 @@
                         $number = 1;
 
                 $comments = get_comments( array( 'number' => $number, 'status' => 'approve' ) );
+                $posts = array();
+                foreach ( (array) $comments as $comment) {
+                        $posts[] = $comment->comment_post_ID;
+                }
+                $posts = array_unique($posts);
+                get_posts( array( 'post__in' => $posts, 'numberposts' => -1, 'update_post_meta_cache' => false, 'update_post_term_cache' => false, 'posts_per_page' => -1 ) );
                 $output .= $before_widget;
                 if ( $title )
                         $output .= $before_title . $title . $after_title;