commit 5518e18c530181191a32b714056352ec834a95fe
Author: Joel Pittet <joel@pittet.ca>
Date:   Tue May 7 17:49:46 2013 -0700

    only the tpl conversion

diff --git a/core/modules/views/templates/views-view-grouping.html.twig b/core/modules/views/templates/views-view-grouping.html.twig
index 0f05da1..ad80090 100644
--- a/core/modules/views/templates/views-view-grouping.html.twig
+++ b/core/modules/views/templates/views-view-grouping.html.twig
@@ -1,28 +1,24 @@
 {#
 /**
  * @file
- * Default theme implementation to print a single grouping in a view.
+ * Default theme implementation to display a single views grouping.
  *
- * It is not actually used in default Views, as this is registered as a theme
- * function which has better performance. For single overrides, the template is
- * perfectly okay.
- *
- * Variables available:
- * - view: The view object
+ * Available variables:
+ * - view: The View object.
  * - grouping: The grouping instruction.
  * - grouping_level: Integer indicating the hierarchical level of the grouping.
- * - rows: The rows contained in this grouping.
- * - title: The title of this grouping.
- * - content: The processed content output that will normally be used.
+ * - title: The group heading.
+ * - content: The content to be grouped. This is set via aggregation settings
+ *   on the view.
+ * - rows: The rows returned from the view.
  *
  * @see template_preprocess()
+ * @see template_preprocess_views_view_grouping()
  *
  * @ingroup themeable
  */
 #}
 <div class="view-grouping">
   <div class="view-grouping-header">{{ title }}</div>
-  <div class="view-grouping-content">
-    {{ content }}
-  </div>
+  <div class="view-grouping-content">{{ content }}</div>
 </div>
diff --git a/core/modules/views/views.theme.inc b/core/modules/views/views.theme.inc
index d620493..476f6b0 100644
--- a/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -296,18 +296,38 @@ function template_preprocess_views_view_fields(&$vars) {
 }
 
 /**
- * Prepares variables for a single grouping within a view templates.
+ * Display a single views grouping.
+ */
+function theme_views_view_grouping($vars) {
+  $view = $vars['view'];
+  $title = $vars['title'];
+  $content = $vars['content'];
+
+  $output = '<div class="view-grouping">';
+  $output .= '<div class="view-grouping-header">' . $title . '</div>';
+  $output .= '<div class="view-grouping-content">' . $content . '</div>' ;
+  $output .= '</div>';
+
+  return $output;
+}
+
+/**
+ * Prepares variables for views single grouping templates.
  *
  * Default template: views-view-grouping.html.twig.
  *
  * @param array $variables
  *   An associative array containing:
- *   - view: @todo.
- *   - rows: @todo.
- *   - grouping_level: @todo.
- */
-function template_preprocess_views_view_grouping(&$variables) {
-  $variables['content'] = $variables['view']->style_plugin->render_grouping_sets($variables['rows'], $variables['grouping_level']);
+ *   - view: The view object.
+ *   - rows: The rows returned from the view.
+ *   - grouping_level: Integer indicating the hierarchical level of the
+ *     grouping.
+ *   - content: The content to be grouped. This is set via aggregation settings
+ *     on the view.
+ *   - title: The group heading.
+  */
+function template_preprocess_views_view_grouping(&$vars) {
+  $vars['content'] = $vars['view']->style_plugin->render_grouping_sets($vars['rows'], $vars['grouping_level']);
 }
 
 /**