From 48e0852c3a8edda855479c78c1366873a2e9edb3 Mon Sep 17 00:00:00 2001
From: Alex Pott <alex.a.pott@googlemail.com>
Date: Sun, 27 Mar 2016 18:01:29 +0100
Subject: [PATCH] Issue #2677414 by blue_waters: VerticalTabs' #default_tab
 broken due to wrong/mismatching class name

---
 core/lib/Drupal/Core/Render/Element/VerticalTabs.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/lib/Drupal/Core/Render/Element/VerticalTabs.php b/core/lib/Drupal/Core/Render/Element/VerticalTabs.php
index 447fc06d30ab..0852209037d0 100644
--- a/core/lib/Drupal/Core/Render/Element/VerticalTabs.php
+++ b/core/lib/Drupal/Core/Render/Element/VerticalTabs.php
@@ -136,7 +136,7 @@ public static function processVerticalTabs(&$element, FormStateInterface $form_s
     $element[$name . '__active_tab'] = array(
       '#type' => 'hidden',
       '#default_value' => $element['#default_tab'],
-      '#attributes' => array('class' => array('vertical-tabs-active-tab')),
+      '#attributes' => array('class' => array('vertical-tabs__active-tab')),
     );
     // Clean up the active tab value so it's not accidentally stored in
     // settings forms.
-- 
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