MC-17814: Insert Widget Slide Out

Author: danmooney2

app/code/Magento/Widget/Block/Adminhtml/Widget/Form.php

@@ -11,6 +11,9 @@
  */
 namespace Magento\Widget\Block\Adminhtml\Widget;
 
+/**
+ * Widget Form Block class
+ */
 class Form extends \Magento\Backend\Block\Widget\Form\Generic
 {
     /**
@@ -47,8 +50,12 @@ protected function _prepareForm()
         $form = $this->_formFactory->create();
 
         // Add messages container to fieldset
-        $fieldset = $form->addFieldset('base_fieldset', ['legend' => '<div data-role="messages"></div>',
-            'comment' => __('Inserting a widget does not create a widget instance.')]);
+        $fieldset = $form->addFieldset(
+            'base_fieldset',
+            [
+                'comment' => __('Inserting a widget does not create a widget instance.'),
+            ]
+        );
 
         $fieldset->addField(
             'select_widget_type',