Ticket #31877: 31877.patch

wp-admin/js/widgets.js

@@ -197 +197 @@
                                 if ( addNew ) {
                                         $widget.find( 'a.widget-action' ).trigger('click');
                                 } else {
+                                        $widget.removeClass( 'open' );
                                         wpWidgets.saveOrder( $sidebar.attr('id') );
                                 }
                         },