diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/widgets/class-wp-widget-media.php
--- a/wp/wp-includes/widgets/class-wp-widget-media.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/widgets/class-wp-widget-media.php	Tue Dec 15 13:49:49 2020 +0100
@@ -72,11 +72,11 @@
 			'edit_media'                 => _x( 'Edit Media', 'label for button in the media widget; should preferably not be longer than ~13 characters long' ),
 			'add_to_widget'              => __( 'Add to Widget' ),
 			'missing_attachment'         => sprintf(
-				/* translators: %s: URL to media library */
+				/* translators: %s: URL to media library. */
 				__( 'We can&#8217;t find that file. Check your <a href="%s">media library</a> and make sure it wasn&#8217;t deleted.' ),
 				esc_url( admin_url( 'upload.php' ) )
 			),
-			/* translators: %d: widget count */
+			/* translators: %d: Widget count. */
 			'media_library_state_multi'  => _n_noop( 'Media Widget (%d)', 'Media Widget (%d)' ),
 			'media_library_state_single' => __( 'Media Widget' ),
 			'unsupported_file_type'      => __( 'Looks like this isn&#8217;t the correct kind of file. Please link to an appropriate file instead.' ),
@@ -106,14 +106,16 @@
 		}
 		$this->registered = true;
 
-		// Note that the widgets component in the customizer will also do the 'admin_print_scripts-widgets.php' action in WP_Customize_Widgets::print_scripts().
+		// Note that the widgets component in the customizer will also do
+		// the 'admin_print_scripts-widgets.php' action in WP_Customize_Widgets::print_scripts().
 		add_action( 'admin_print_scripts-widgets.php', array( $this, 'enqueue_admin_scripts' ) );
 
 		if ( $this->is_preview() ) {
 			add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_preview_scripts' ) );
 		}
 
-		// Note that the widgets component in the customizer will also do the 'admin_footer-widgets.php' action in WP_Customize_Widgets::print_footer_scripts().
+		// Note that the widgets component in the customizer will also do
+		// the 'admin_footer-widgets.php' action in WP_Customize_Widgets::print_footer_scripts().
 		add_action( 'admin_footer-widgets.php', array( $this, 'render_control_template_scripts' ) );
 
 		add_filter( 'display_media_states', array( $this, 'display_media_state' ), 10, 2 );
@@ -127,6 +129,7 @@
 	 * @see WP_REST_Controller::get_item_schema()
 	 * @see WP_REST_Controller::get_additional_fields()
 	 * @link https://core.trac.wordpress.org/ticket/35574
+	 *
 	 * @return array Schema for properties.
 	 */
 	public function get_instance_schema() {
@@ -273,7 +276,10 @@
 			}
 			$value = $new_instance[ $field ];
 
-			// Workaround for rest_validate_value_from_schema() due to the fact that rest_is_boolean( '' ) === false, while rest_is_boolean( '1' ) is true.
+			/*
+			 * Workaround for rest_validate_value_from_schema() due to the fact that
+			 * rest_is_boolean( '' ) === false, while rest_is_boolean( '1' ) is true.
+			 */
 			if ( 'boolean' === $field_schema['type'] && '' === $value ) {
 				$value = false;
 			}
@@ -320,8 +326,8 @@
 	 * @since 4.8.0
 	 *
 	 * @see \WP_Widget_Media::render_control_template_scripts() Where the JS template is located.
+	 *
 	 * @param array $instance Current settings.
-	 * @return void
 	 */
 	final public function form( $instance ) {
 		$instance_schema = $this->get_instance_schema();