Ticket #41392: 41392.0.diff

src/wp-includes/widgets/class-wp-widget-custom-html.php

@@ -79 +79 @@
                 if ( ! empty( $title ) ) {
                         echo $args['before_title'] . $title . $args['after_title'];
                 }
+                echo '<div class="textwidget custom-html-widget">';
                 echo $content;
+                echo '</div>';
                 echo $args['after_widget'];
         }