diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-admin/includes/widgets.php
--- a/wp/wp-admin/includes/widgets.php	Tue Jun 09 11:14:17 2015 +0000
+++ b/wp/wp-admin/includes/widgets.php	Mon Oct 14 17:39:30 2019 +0200
@@ -10,6 +10,9 @@
  * Display list of the available widgets.
  *
  * @since 2.5.0
+ *
+ * @global array $wp_registered_widgets
+ * @global array $wp_registered_widget_controls
  */
 function wp_list_widgets() {
 	global $wp_registered_widgets, $wp_registered_widget_controls;
@@ -51,6 +54,8 @@
  *
  * @since 3.1.0
  * @access private
+ *
+ * @return int
  */
 function _sort_name_callback( $a, $b ) {
 	return strnatcasecmp( $a['name'], $b['name'] );
@@ -62,8 +67,8 @@
  *
  * @since 2.5.0
  *
- * @param string $sidebar id slug of the sidebar
- * @param string optional $sidebar_name Include the HTML for the sidebar name
+ * @param string $sidebar      Sidebar ID.
+ * @param string $sidebar_name Optional. Sidebar name. Default empty.
  */
 function wp_list_widget_controls( $sidebar, $sidebar_name = '' ) {
 	add_filter( 'dynamic_sidebar_params', 'wp_list_widget_controls_dynamic_sidebar' );
@@ -75,30 +80,37 @@
 	if ( $sidebar_name ) {
 		?>
 		<div class="sidebar-name">
-			<div class="sidebar-name-arrow"><br /></div>
-			<h3><?php echo esc_html( $sidebar_name ); ?> <span class="spinner"></span></h3>
+			<button type="button" class="handlediv hide-if-no-js" aria-expanded="true">
+				<span class="screen-reader-text"><?php echo esc_html( $sidebar_name ); ?></span>
+				<span class="toggle-indicator" aria-hidden="true"></span>
+			</button>
+			<h2><?php echo esc_html( $sidebar_name ); ?> <span class="spinner"></span></h2>
 		</div>
 		<?php
 	}
 
-	echo '<div class="sidebar-description">';
-
 	if ( ! empty( $description ) ) {
-		echo '<p class="description">' . $description . '</p>';
+		?>
+		<div class="sidebar-description">
+			<p class="description"><?php echo $description; ?></p>
+		</div>
+		<?php
 	}
 
-	echo '</div>';
-
 	dynamic_sidebar( $sidebar );
 
 	echo '</div>';
 }
 
 /**
- * {@internal Missing Short Description}}
+ * Retrieves the widget control arguments.
  *
  * @since 2.5.0
  *
+ * @global array $wp_registered_widgets
+ *
+ * @staticvar int $i
+ *
  * @param array $params
  * @return array
  */
@@ -123,7 +135,14 @@
 	return $params;
 }
 
-function next_widget_id_number($id_base) {
+/**
+ *
+ * @global array $wp_registered_widgets
+ *
+ * @param string $id_base
+ * @return int
+ */
+function next_widget_id_number( $id_base ) {
 	global $wp_registered_widgets;
 	$number = 1;
 
@@ -143,6 +162,10 @@
  *
  * @since 2.5.0
  *
+ * @global array $wp_registered_widgets
+ * @global array $wp_registered_widget_controls
+ * @global array $sidebars_widgets
+ *
  * @param array $sidebar_args
  * @return array
  */
@@ -161,6 +184,11 @@
 	$multi_number = isset($sidebar_args['_multi_num']) ? $sidebar_args['_multi_num'] : '';
 	$add_new = isset($sidebar_args['_add']) ? $sidebar_args['_add'] : '';
 
+	$before_form = isset( $sidebar_args['before_form'] ) ? $sidebar_args['before_form'] : '<form method="post">';
+	$after_form = isset( $sidebar_args['after_form'] ) ? $sidebar_args['after_form'] : '</form>';
+	$before_widget_content = isset( $sidebar_args['before_widget_content'] ) ? $sidebar_args['before_widget_content'] : '<div class="widget-content">';
+	$after_widget_content = isset( $sidebar_args['after_widget_content'] ) ? $sidebar_args['after_widget_content'] : '</div>';
+
 	$query_arg = array( 'editwidget' => $widget['id'] );
 	if ( $add_new ) {
 		$query_arg['addnew'] = 1;
@@ -194,25 +222,30 @@
 	echo $sidebar_args['before_widget']; ?>
 	<div class="widget-top">
 	<div class="widget-title-action">
-		<a class="widget-action hide-if-no-js" href="#available-widgets"></a>
+		<button type="button" class="widget-action hide-if-no-js" aria-expanded="false">
+			<span class="screen-reader-text"><?php printf( __( 'Edit widget: %s' ), $widget_title ); ?></span>
+			<span class="toggle-indicator" aria-hidden="true"></span>
+		</button>
 		<a class="widget-control-edit hide-if-js" href="<?php echo esc_url( add_query_arg( $query_arg ) ); ?>">
 			<span class="edit"><?php _ex( 'Edit', 'widget' ); ?></span>
 			<span class="add"><?php _ex( 'Add', 'widget' ); ?></span>
 			<span class="screen-reader-text"><?php echo $widget_title; ?></span>
 		</a>
 	</div>
-	<div class="widget-title"><h4><?php echo $widget_title ?><span class="in-widget-title"></span></h4></div>
+	<div class="widget-title"><h3><?php echo $widget_title; ?><span class="in-widget-title"></span></h3></div>
 	</div>
 
 	<div class="widget-inside">
-	<form method="post">
-	<div class="widget-content">
-<?php
-	if ( isset($control['callback']) )
+	<?php echo $before_form; ?>
+	<?php echo $before_widget_content; ?>
+	<?php
+	if ( isset( $control['callback'] ) ) {
 		$has_form = call_user_func_array( $control['callback'], $control['params'] );
-	else
-		echo "\t\t<p>" . __('There are no options for this widget.') . "</p>\n"; ?>
-	</div>
+	} else {
+		echo "\t\t<p>" . __('There are no options for this widget.') . "</p>\n";
+	}
+	?>
+	<?php echo $after_widget_content; ?>
 	<input type="hidden" name="widget-id" class="widget-id" value="<?php echo esc_attr($id_format); ?>" />
 	<input type="hidden" name="id_base" class="id_base" value="<?php echo esc_attr($id_base); ?>" />
 	<input type="hidden" name="widget-width" class="widget-width" value="<?php if (isset( $control['width'] )) echo esc_attr($control['width']); ?>" />
@@ -223,16 +256,19 @@
 
 	<div class="widget-control-actions">
 		<div class="alignleft">
-		<a class="widget-control-remove" href="#remove"><?php _e('Delete'); ?></a> |
-		<a class="widget-control-close" href="#close"><?php _e('Close'); ?></a>
+			<button type="button" class="button-link button-link-delete widget-control-remove"><?php _e( 'Delete' ); ?></button>
+			<span class="widget-control-close-wrapper">
+				|
+				<button type="button" class="button-link widget-control-close"><?php _e( 'Done' ); ?></button>
+			</span>
 		</div>
 		<div class="alignright<?php if ( 'noform' === $has_form ) echo ' widget-control-noform'; ?>">
-			<?php submit_button( __( 'Save' ), 'button-primary widget-control-save right', 'savewidget', false, array( 'id' => 'widget-' . esc_attr( $id_format ) . '-savewidget' ) ); ?>
+			<?php submit_button( __( 'Save' ), 'primary widget-control-save right', 'savewidget', false, array( 'id' => 'widget-' . esc_attr( $id_format ) . '-savewidget' ) ); ?>
 			<span class="spinner"></span>
 		</div>
 		<br class="clear" />
 	</div>
-	</form>
+	<?php echo $after_form; ?>
 	</div>
 
 	<div class="widget-description">
@@ -243,3 +279,12 @@
 
 	return $sidebar_args;
 }
+
+/**
+ *
+ * @param string $classes
+ * @return string
+ */
+function wp_widgets_access_body_class($classes) {
+	return "$classes widgets_access ";
+}