* zin: add open-url class to backBtn element.

lib/zin/wg/backbtn/v1.php

@@ -45,4 +45,17 @@ class backBtn extends btn
         $props['data-back'] = $this->prop('back');
         return $props;
     }
+
+    /**
+     * Override the getClassList method.
+     *
+     * @access protected
+     * @return array
+     */
+    protected function getClassList(): array
+    {
+        $classList = parent::getClassList();
+        $classList['open-url'] = true;
+        return $classList;
+    }
 }

lib/zin/wg/btn/v1.php

@@ -66,7 +66,7 @@ class btn extends wg
         return $children;
     }
 
-    private function getClassList()
+    protected function getClassList()
     {
         list($url, $type, $caret, $text, $icon, $trailingIcon) = $this->prop(array('url', 'type', 'caret', 'text', 'icon', 'trailingIcon'));
         $onlyCaret = empty($text) && !empty($caret) && empty($icon) && empty($trailingIcon);