Add EventObject to CMS Page/Block Collection

Author: osrecio

app/code/Magento/Cms/Model/ResourceModel/Page/Collection.php

@@ -30,14 +30,14 @@ class Collection extends AbstractCollection
      *
      * @var string
      */
-    protected $_eventPrefix = 'page_collection';
+    protected $_eventPrefix = 'cms_page_collection';
 
     /**
      * Event object
      *
      * @var string
      */
-    protected $_eventObject = 'order_item_collection';
+    protected $_eventObject = 'page_collection';
 
     /**
      * Define resource model