Ticket #38031: 38031.diff

src/wp-includes/widgets.php

@@ -1117 +1117 @@
                 'after_title'   => '</h2>',
         );
         $args                  = wp_parse_args( $args, $default_args );
+
+        //Allow modifying widget args via filter hook 
+        $args = apply_filters( 'the_widget_args', $args );
         $args['before_widget'] = sprintf( $args['before_widget'], $widget_obj->widget_options['classname'] );
 
         $instance = wp_parse_args( $instance );