Merge remote-tracking branch 'trigger/AC-1429-with-24-develop' into AC-1390

Author: xmav

lib/web/mage/backend/tabs.js

@@ -239,11 +239,22 @@ define([
     // Extension for mage.tabs - Ajax functionality for tabs
     $.widget('mage.tabs', $.mage.tabs, {
         options: {
-            ajaxOptions: {
-                data: {
-                    isAjax: true,
-                    'form_key': typeof FORM_KEY !== 'undefined' ? FORM_KEY : null
-                }
+            /**
+             * Add form key to ajax call
+             * @param {Object} event - event object
+             * @param {Object} ui
+             */
+            beforeLoad: function (event, ui) {
+                ui.ajaxSettings.type = 'POST';
+                ui.ajaxSettings.hasContent = true;
+                ui.jqXHR.setRequestHeader('Content-Type', ui.ajaxSettings.contentType);
+                ui.ajaxSettings.data = jQuery.param(
+                    {
+                        isAjax: true,
+                        'form_key': typeof FORM_KEY !== 'undefined' ? FORM_KEY : null
+                    },
+                    ui.ajaxSettings.traditional
+                );
             },
 
             /**