commit c6381a7f7618f4e752bc15534fe8cee9d4c0f6eb
Author: Lorenz Schori <lo@znerol.ch>
Date:   Sun Nov 4 22:06:58 2012 +0100

    Use array_merge_recursive in seach_admin_settings

diff --git a/core/modules/search/search.admin.inc b/core/modules/search/search.admin.inc
index 57e5d6b..30100e4 100644
--- a/core/modules/search/search.admin.inc
+++ b/core/modules/search/search.admin.inc
@@ -129,7 +129,7 @@ function search_admin_settings($form, &$form_state) {
   foreach ($config->get('active_modules') as $module) {
     $added_form = module_invoke($module, 'search_admin');
     if (is_array($added_form)) {
-      $form = array_merge($form, $added_form);
+      $form = array_merge_recursive($form, $added_form);
     }
   }