Ticket #18402: 21272.patch

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

@@ -363 +363 @@
                                         clean_post_cache( $page );
                                 }
 
-                                if ( 0 == $page->post_parent )
-                                        $top_level_pages[] = $page;
+                                if ( 0 == $page->post_parent || !$this->is_post_in_array( $page->post_parent, $pages ))
+                                    $top_level_pages[] = $page;
                                 else
-                                        $children_pages[ $page->post_parent ][] = $page;
+                                    $children_pages[ $page->post_parent ][] = $page;
                         }
 
                         $pages = &$top_level_pages;
@@ -514 +514 @@
                                                         if ( is_null( $parent ) )
                                                                 break;
 
-                                                        $level++;
                                                         $find_main_page = (int) $parent->post_parent;
 
-                                                        if ( !isset( $parent_name ) )
+                                                        if ( !isset( $parent_name ) && $parent->post_status != 'trash' )
                                                                 $parent_name = apply_filters( 'the_title', $parent->post_title, $parent->ID );
                                                 }
                                         }
@@ -1060 +1059 @@
                 </tbody></table></form>
 <?php
         }
+
+        /**
+         * Determine if a post object with certain ID exists in an array of post objects
+         *
+         * @return bool
+         */
+        function is_post_in_array( $post_id, $posts ) {    
+                foreach ( $posts as $post ) {
+                        if ( $post->ID == $post_id ) {
+                                return true;
+                        }
+                }
+                return false;
+        }  
 }