MC-5538: Search terms are not cached in case of form_key present in the request

Author: irenelagno

app/code/Magento/CatalogSearch/Test/Mftf/ActionGroup/StorefrontCatalogSearchActionGroup.xml

@@ -16,6 +16,7 @@
         <submitForm selector="#search_mini_form" parameterArray="['q' => '{{phrase}}']" stepKey="fillQuickSearch" />
         <seeInCurrentUrl url="{{StorefrontCatalogSearchPage.url}}" stepKey="checkUrl"/>
         <seeInTitle userInput="Search results for: '{{phrase}}'" stepKey="assertQuickSearchTitle"/>
+        <dontSeeInCurrentUrl url="form_key=" stepKey="checkUrlFormKey"/>
         <see userInput="Search results for: '{{phrase}}'" selector="{{StorefrontCatalogSearchMainSection.SearchTitle}}" stepKey="assertQuickSearchName"/>
     </actionGroup>
 

lib/web/mage/common.js

@@ -21,7 +21,7 @@ define([
                 form = $(e.target),
                 formKey = $('input[name="form_key"]').val();
 
-            if (formKey && !form.find('input[name="form_key"]').length) {
+            if (formKey && !form.find('input[name="form_key"]').length && form[0].method !== 'get') {
                 formKeyElement = document.createElement('input');
                 formKeyElement.setAttribute('type', 'hidden');
                 formKeyElement.setAttribute('name', 'form_key');