--- a/wp/wp-admin/edit.php	Mon Jun 08 16:11:51 2015 +0000
+++ b/wp/wp-admin/edit.php	Tue Jun 09 03:35:32 2015 +0200
@@ -12,6 +12,14 @@
 if ( ! $typenow )
 	wp_die( __( 'Invalid post type' ) );
 
+if ( 'attachment' === $typenow ) {
+	if ( wp_redirect( admin_url( 'upload.php' ) ) ) {
+		exit;
+	}
+}
+
+global $post_type, $post_type_object;
+
 $post_type = $typenow;
 $post_type_object = get_post_type_object( $post_type );
 
@@ -19,7 +27,7 @@
 	wp_die( __( 'Invalid post type' ) );
 
 if ( ! current_user_can( $post_type_object->cap->edit_posts ) )
-	wp_die( __( 'Cheatin’ uh?' ) );
+	wp_die( __( 'Cheatin’ uh?' ), 403 );
 
 $wp_list_table = _get_list_table('WP_Posts_List_Table');
 $pagenum = $wp_list_table->get_pagenum();
@@ -56,9 +64,12 @@
 		$sendback = admin_url($post_new_file);
 
 	if ( 'delete_all' == $doaction ) {
+		// Prepare for deletion of all posts with a specified post status (i.e. Empty trash).
 		$post_status = preg_replace('/[^a-z0-9_-]+/i', '', $_REQUEST['post_status']);
-		if ( get_post_status_object($post_status) ) // Check the post status exists first
+		// Validate the post status exists.
+		if ( get_post_status_object( $post_status ) ) {
 			$post_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_type=%s AND post_status = %s", $post_type, $post_status ) );
+		}
 		$doaction = 'delete';
 	} elseif ( isset( $_REQUEST['media'] ) ) {
 		$post_ids = $_REQUEST['media'];
@@ -152,6 +163,7 @@
 $wp_list_table->prepare_items();
 
 wp_enqueue_script('inline-edit-post');
+wp_enqueue_script('heartbeat');
 
 $title = $post_type_object->labels->name;
 
@@ -196,8 +208,8 @@
 
 	get_current_screen()->set_help_sidebar(
 	'<p><strong>' . __('For more information:') . '</strong></p>' .
-	'<p>' . __('<a href="http://codex.wordpress.org/Posts_Screen" target="_blank">Documentation on Managing Posts</a>') . '</p>' .
-	'<p>' . __('<a href="http://wordpress.org/support/" target="_blank">Support Forums</a>') . '</p>'
+	'<p>' . __('<a href="https://codex.wordpress.org/Posts_Screen" target="_blank">Documentation on Managing Posts</a>') . '</p>' .
+	'<p>' . __('<a href="https://wordpress.org/support/" target="_blank">Support Forums</a>') . '</p>'
 	);
 
 } elseif ( 'page' == $post_type ) {
@@ -217,12 +229,12 @@
 
 	get_current_screen()->set_help_sidebar(
 	'<p><strong>' . __('For more information:') . '</strong></p>' .
-	'<p>' . __('<a href="http://codex.wordpress.org/Pages_Screen" target="_blank">Documentation on Managing Pages</a>') . '</p>' .
-	'<p>' . __('<a href="http://wordpress.org/support/" target="_blank">Support Forums</a>') . '</p>'
+	'<p>' . __('<a href="https://codex.wordpress.org/Pages_Screen" target="_blank">Documentation on Managing Pages</a>') . '</p>' .
+	'<p>' . __('<a href="https://wordpress.org/support/" target="_blank">Support Forums</a>') . '</p>'
 	);
 }
 
-add_screen_option( 'per_page', array( 'label' => $title, 'default' => 20, 'option' => 'edit_' . $post_type . '_per_page' ) );
+add_screen_option( 'per_page', array( 'default' => 20, 'option' => 'edit_' . $post_type . '_per_page' ) );
 
 $bulk_counts = array(
 	'updated'   => isset( $_REQUEST['updated'] )   ? absint( $_REQUEST['updated'] )   : 0,
@@ -235,14 +247,16 @@
 $bulk_messages = array();
 $bulk_messages['post'] = array(
 	'updated'   => _n( '%s post updated.', '%s posts updated.', $bulk_counts['updated'] ),
-	'locked'    => _n( '%s post not updated, somebody is editing it.', '%s posts not updated, somebody is editing them.', $bulk_counts['locked'] ),
+	'locked'    => ( 1 == $bulk_counts['locked'] ) ? __( '1 post not updated, somebody is editing it.' ) :
+	                   _n( '%s post not updated, somebody is editing it.', '%s posts not updated, somebody is editing them.', $bulk_counts['locked'] ),
 	'deleted'   => _n( '%s post permanently deleted.', '%s posts permanently deleted.', $bulk_counts['deleted'] ),
 	'trashed'   => _n( '%s post moved to the Trash.', '%s posts moved to the Trash.', $bulk_counts['trashed'] ),
 	'untrashed' => _n( '%s post restored from the Trash.', '%s posts restored from the Trash.', $bulk_counts['untrashed'] ),
 );
 $bulk_messages['page'] = array(
 	'updated'   => _n( '%s page updated.', '%s pages updated.', $bulk_counts['updated'] ),
-	'locked'    => _n( '%s page not updated, somebody is editing it.', '%s pages not updated, somebody is editing them.', $bulk_counts['locked'] ),
+	'locked'    => ( 1 == $bulk_counts['locked'] ) ? __( '1 page not updated, somebody is editing it.' ) :
+	                   _n( '%s page not updated, somebody is editing it.', '%s pages not updated, somebody is editing them.', $bulk_counts['locked'] ),
 	'deleted'   => _n( '%s page permanently deleted.', '%s pages permanently deleted.', $bulk_counts['deleted'] ),
 	'trashed'   => _n( '%s page moved to the Trash.', '%s pages moved to the Trash.', $bulk_counts['trashed'] ),
 	'untrashed' => _n( '%s page restored from the Trash.', '%s pages restored from the Trash.', $bulk_counts['untrashed'] ),
@@ -265,7 +279,6 @@
 require_once( ABSPATH . 'wp-admin/admin-header.php' );
 ?>
 <div class="wrap">
-<?php screen_icon(); ?>
 <h2><?php
 echo esc_html( $post_type_object->labels->name );
 if ( current_user_can( $post_type_object->cap->create_posts ) )
@@ -290,7 +303,7 @@
 }
 
 if ( $messages )
-	echo '<div id="message" class="updated"><p>' . join( ' ', $messages ) . '</p></div>';
+	echo '<div id="message" class="updated notice is-dismissible"><p>' . join( ' ', $messages ) . '</p></div>';
 unset( $messages );
 
 $_SERVER['REQUEST_URI'] = remove_query_arg( array( 'locked', 'skipped', 'updated', 'deleted', 'trashed', 'untrashed' ), $_SERVER['REQUEST_URI'] );
@@ -298,7 +311,7 @@
 
 <?php $wp_list_table->views(); ?>
 
-<form id="posts-filter" action="" method="get">
+<form id="posts-filter" method="get">
 
 <?php $wp_list_table->search_box( $post_type_object->labels->search_items, 'post' ); ?>