commit 6f0ff4a61d232e5cb22241661cb82b83532d99ca
Author: Joel Pittet <joel@pittet.ca>
Date:   Sun Apr 7 21:33:17 2013 -0700

    pre_render first attempt

diff --git a/core/modules/views/templates/views-form-views-form.html.twig b/core/modules/views/templates/views-form-views-form.html.twig
deleted file mode 100644
index 6edbeb8..0000000
--- a/core/modules/views/templates/views-form-views-form.html.twig
+++ /dev/null
@@ -1,15 +0,0 @@
-{#
-/**
-* @file
-* Default theme implementation to display form children.
-*
-* Available variables:
-* - children: Form child elements.
-*
-* @see template_preprocess()
-* @see template_preprocess_views_form_views_form()
-*
-* @ingroup themeable
-*/
-#}
-{{ children }}
diff --git a/core/modules/views/views.module b/core/modules/views/views.module
index 39ad43b..3a740c1 100644
--- a/core/modules/views/views.module
+++ b/core/modules/views/views.module
@@ -159,7 +159,6 @@ function views_theme($existing, $type, $theme, $path) {
 
   $hooks['views_form_views_form'] = $base + array(
     'render element' => 'form',
-    'template' => 'views-form-views-form',
   );
 
   $hooks['views_exposed_form'] = $base + array(
@@ -1272,7 +1271,8 @@ function views_form($form, &$form_state, ViewExecutable $view, $output) {
 function views_form_views_form($form, &$form_state, ViewExecutable $view, $output) {
   $form['#prefix'] = '<div class="views-form">';
   $form['#suffix'] = '</div>';
-  $form['#theme'] = 'views_form_views_form';
+  $form['#theme'] = 'form';
+  $form['#pre_render'][] = 'views_pre_render_views_form_views_form';
   $form['#validate'][] = 'views_form_views_form_validate';
   $form['#submit'][] = 'views_form_views_form_submit';
 
@@ -1404,6 +1404,45 @@ function views_form_views_form_submit($form, &$form_state) {
 }
 
 /**
+ * Replaces views substitution placeholders.
+ *
+ * @param array $element
+ *   An associative array containing the properties of the element.
+ *   Properties used: #substitutions, @todo.
+ * @return array
+ *   The $element with prepared variables ready for #theme 'form' in views_form_views_form.
+ */
+function views_pre_render_views_form_views_form($element) {
+  $form = $element['form'];
+
+  // Placeholders and their substitutions (usually rendered form elements).
+  $search = array();
+  $replace = array();
+
+  // Add in substitutions provided by the form.
+  foreach ($form['#substitutions']['#value'] as $substitution) {
+    $field_name = $substitution['field_name'];
+    $row_id = $substitution['row_id'];
+
+    $search[] = $substitution['placeholder'];
+    $replace[] = isset($form[$field_name][$row_id]) ? drupal_render($form[$field_name][$row_id]) : '';
+  }
+  // Add in substitutions from hook_views_form_substitutions().
+  $substitutions = Drupal::moduleHandler()->invokeAll('views_form_substitutions');
+  foreach ($substitutions as $placeholder => $substitution) {
+    $search[] = $placeholder;
+    $replace[] = $substitution;
+  }
+
+  // Apply substitutions to the rendered output.
+  $form['output']['#markup'] = str_replace($search, $replace, $form['output']['#markup']);
+
+  // Render and add remaining form fields.
+  $element['#children'] = drupal_render_children($form);
+  return $element;
+}
+
+/**
  * Form builder for the exposed widgets form.
  *
  * Be sure that $view and $display are references.
diff --git a/core/modules/views/views.theme.inc b/core/modules/views/views.theme.inc
index 6eb5ff7..8474b13 100644
--- a/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -1004,45 +1004,6 @@ function template_preprocess_views_exposed_form(&$vars) {
   $vars['button'] = drupal_render_children($form);
 }
 
-/**
- * Prepares variables for views form views form.
- *
- * Default template: views-form-views-form.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *     - children: Stores the form children as rendered by drupal_render_children()
- *     - form: A dependency that the form children are derived from
- */
-function template_preprocess_views_form_views_form(&$variables) {
-  $form = $variables['form'];
-
-  // Placeholders and their substitutions (usually rendered form elements).
-  $search = array();
-  $replace = array();
-
-  // Add in substitutions provided by the form.
-  foreach ($form['#substitutions']['#value'] as $substitution) {
-    $field_name = $substitution['field_name'];
-    $row_id = $substitution['row_id'];
-
-    $search[] = $substitution['placeholder'];
-    $replace[] = isset($form[$field_name][$row_id]) ? drupal_render($form[$field_name][$row_id]) : '';
-  }
-  // Add in substitutions from hook_views_form_substitutions().
-  $substitutions = Drupal::moduleHandler()->invokeAll('views_form_substitutions');
-  foreach ($substitutions as $placeholder => $substitution) {
-    $search[] = $placeholder;
-    $replace[] = $substitution;
-  }
-
-  // Apply substitutions to the rendered output.
-  $form['output']['#markup'] = str_replace($search, $replace, $form['output']['#markup']);
-
-  // Render and add remaining form fields.
-  $variables['children'] = drupal_render_children($form);
-}
-
 function theme_views_mini_pager($vars) {
   global $pager_page_array, $pager_total;