remove duplicated events on wisiwyg initialization

Author: Nazar65

lib/internal/Magento/Framework/Data/Form/Element/Editor.php

@@ -533,10 +533,6 @@ protected function getInlineJs($jsSetupObject, $forceLoad)
             $jsSetupObject .
             '));
                     varienGlobalEvents.attachEventHandler("formSubmit", editorFormValidationHandler);
-                    varienGlobalEvents.clearEventHandlers("open_browser_callback");
-                    varienGlobalEvents.attachEventHandler("open_browser_callback", ' .
-            $jsSetupObject .
-            '.openFileBrowser);
                 //]]>
                 });
                 </script>';

lib/web/mage/adminhtml/wysiwyg/tiny_mce/tinymce4Adapter.js

@@ -373,7 +373,7 @@ define([
         /**
          * @param {Object} o
          */
-        openFileBrowser: _.debounce(function (o) {
+        openFileBrowser: function (o) {
             var typeTitle = this.translate('Select Images'),
                 storeId = this.config['store_id'] ? this.config['store_id'] : 0,
                 frameDialog = jQuery('div.mce-container[role="dialog"]'),
@@ -406,7 +406,7 @@ define([
                     }
                 );
             });
-        }, 250),
+        },
 
         /**
          * @param {String} string