Ticket #25791: add_nesting_class.diff

wp-admin/includes/class-wp-posts-list-table.php

@@ -491 +491 @@
                         $classes .= ' wp-locked';
                         $lock_holder = get_userdata( $lock_holder );
                 }
+                if ( $post->post_parent ) {
+                    $count = count( get_post_ancestors($post->ID) );
+                    $classes .= ' level-'. $count;
+                } else {
+                    $classes .= ' level-0';
+                }
         ?>
                 <tr id="post-<?php echo $post->ID; ?>" class="<?php echo implode( ' ', get_post_class( $classes, $post->ID ) ); ?>" valign="top">
         <?php