commit b49c989e8e0bc383d83ef7059bedeaeba234bc41
Author: Joel Pittet <joel@pittet.ca>
Date:   Wed May 27 19:54:57 2015 -0700

    search and datetime

diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index c9959af..f481902 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -492,29 +492,14 @@ function template_preprocess_datetime_form(&$variables) {
  *
  * @param array $variables
  *   An associative array containing:
- *   - element: An associative array containing the properties of the element.
- *     Properties used: #title, #children, #required, #attributes.
+ *   - title: The title text.
+ *   - title_attributes: An Attribute object for the title element.
+ *   - description: The help text description of the field.
+ *   - required: A required boolean state for the date field.
+ *   - children: The form element content.
  */
 function template_preprocess_datetime_wrapper(&$variables) {
-  $element = $variables['element'];
-
-  if (!empty($element['#title'])) {
-    $variables['title'] = $element['#title'];
-  }
-
-  if (!empty($element['#description'])) {
-    $variables['description'] = $element['#description'];
-  }
-
-  $variables['required'] = FALSE;
-  // For required datetime fields a 'form-required' class is appended to the
-  // label attributes.
-  if (!empty($element['#required'])) {
-    $variables['required'] = TRUE;
-  }
-  $variables['content'] = $element['#children'];
-
-  $variables['title_attributes'] = isset($variables['title_attributes']) ? new Attribute($variables['title_attributes']) : new Attribute();
+  $variables['content'] = $variables['children'];
 }
 
 /**
@@ -1737,9 +1722,15 @@ function drupal_common_theme() {
     'datetime_form' => array(
       'render element' => 'element',
     ),
-    'datetime_wrapper' => array(
-      'render element' => 'element',
-    ),
+    'datetime_wrapper' => [
+      'variables' => [
+        'title' => '',
+        'title_attributes' => new Attribute(),
+        'description' => '',
+        'required' => FALSE,
+        'children' => '',
+      ],
+    ],
     'status_messages' => array(
       'variables' => ['status_headings' => [], 'message_list' => NULL],
     ),
diff --git a/core/modules/datetime/src/Plugin/Field/FieldWidget/DateTimeWidgetBase.php b/core/modules/datetime/src/Plugin/Field/FieldWidget/DateTimeWidgetBase.php
index 32d3668..1a7c434 100644
--- a/core/modules/datetime/src/Plugin/Field/FieldWidget/DateTimeWidgetBase.php
+++ b/core/modules/datetime/src/Plugin/Field/FieldWidget/DateTimeWidgetBase.php
@@ -11,6 +11,7 @@
 use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\Core\Field\WidgetBase;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Template\Attribute;
 use Drupal\datetime\Plugin\Field\FieldType\DateTimeItem;
 
 /**
@@ -28,7 +29,9 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
     // title because the actual title display is handled at a higher level by
     // the Field module.
 
-    $element['#theme_wrappers'][] = 'datetime_wrapper';
+    $element['#theme_wrappers']['datetime_wrapper'] = [
+      '#title_attributes' => new Attribute(),
+    ];
     $element['#attributes']['class'][] = 'container-inline';
 
     $element['value'] = array(
diff --git a/core/modules/search/search.module b/core/modules/search/search.module
index 462e4db..afe514d 100644
--- a/core/modules/search/search.module
+++ b/core/modules/search/search.module
@@ -11,6 +11,7 @@
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Template\Attribute;
 
 /**
  * Matches all 'N' Unicode character classes (numbers)
@@ -103,7 +104,12 @@ function search_help($route_name, RouteMatchInterface $route_match) {
 function search_theme() {
   return array(
     'search_result' => array(
-      'variables' => array('result' => NULL, 'plugin_id' => NULL),
+      'variables' => [
+        'result' => NULL,
+        'plugin_id' => NULL,
+        'title_attributes' => new Attribute(),
+        'content_attributes' => new Attribute(),
+      ],
       'file' => 'search.pages.inc',
     ),
   );
diff --git a/core/modules/search/search.pages.inc b/core/modules/search/search.pages.inc
index dba393a..b50a6cd 100644
--- a/core/modules/search/search.pages.inc
+++ b/core/modules/search/search.pages.inc
@@ -7,7 +7,6 @@
 
 use Drupal\Component\Utility\SafeMarkup;
 use Drupal\Core\Language\LanguageInterface;
-use Drupal\Core\Template\Attribute;
 
 /**
  * Implements hook_theme_suggestions_HOOK().
@@ -65,7 +64,5 @@ function template_preprocess_search_result(&$variables) {
     '#template' => '{{ info|safe_join(" - ") }}',
     '#context' => array('info' => $info),
   );
-  $variables['title_attributes'] = isset($variables['title_attributes']) ? new Attribute($variables['title_attributes']) : new Attribute();
-  $variables['content_attributes'] = isset($variables['content_attributes']) ? new Attribute($variables['content_attributes']) : new Attribute();
 }