diff -u b/core/modules/comment/lib/Drupal/comment/Plugin/views/field/NodeNewComments.php b/core/modules/comment/lib/Drupal/comment/Plugin/views/field/NodeNewComments.php
--- b/core/modules/comment/lib/Drupal/comment/Plugin/views/field/NodeNewComments.php
+++ b/core/modules/comment/lib/Drupal/comment/Plugin/views/field/NodeNewComments.php
@@ -57,7 +57,7 @@
     $this->field_alias = $this->table . '_' . $this->field;
   }
 
-  public function preRender(&$values) {
+  function pre_render(&$values) {
     global $user;
     if (!$user->uid || empty($values)) {
       return;
@@ -91,7 +91,7 @@
     $this->field_alias = $this->table . '_' . $this->field;
   }
 
-  function pre_render(&$values) {
+  public function preRender(&$values) {
     global $user;
     if (!$user->uid || empty($values)) {
       return;
diff -u b/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php b/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php
--- b/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php
@@ -35,7 +35,7 @@
     $this->field_alias = $this->aliases['uid'];
   }
 
-  public function preRender(&$values) {
+  function pre_render(&$values) {
     $uids = array();
     $this->items = array();
 
@@ -69,7 +69,7 @@
     $this->field_alias = $this->aliases['uid'];
   }
 
-  function pre_render(&$values) {
+  public function preRender(&$values) {
     $uids = array();
     $this->items = array();
 
diff -u b/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php b/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php
--- b/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php
@@ -35,7 +35,7 @@
     $this->field_alias = $this->aliases['uid'];
   }
 
-  public function preRender(&$values) {
+  function pre_render(&$values) {
     $uids = array();
     $this->items = array();
 
@@ -69,7 +69,7 @@
     $this->field_alias = $this->aliases['uid'];
   }
 
-  function pre_render(&$values) {
+  public function preRender(&$values) {
     $uids = array();
     $this->items = array();
 
diff -u b/core/modules/user/lib/Drupal/user/Tests/Views/HandlerFieldRoleTest.php b/core/modules/user/lib/Drupal/user/Tests/Views/HandlerFieldRoleTest.php
--- b/core/modules/user/lib/Drupal/user/Tests/Views/HandlerFieldRoleTest.php
+++ b/core/modules/user/lib/Drupal/user/Tests/Views/HandlerFieldRoleTest.php
@@ -49,7 +49,7 @@
     $view = views_get_view('test_views_handler_field_role');
     $this->executeView($view);
     $view->row_index = 0;
-    // The role field is populated during pre_render.
+    // The role field is populated during preRender.
     $view->field['rid']->preRender($view->result);
     $render = $view->field['rid']->advancedRender($view->result[0]);
 
reverted:
--- b/core/modules/views/lib/Drupal/views/Plugin/views/area/Title.php
+++ a/core/modules/views/lib/Drupal/views/Plugin/views/area/Title.php
@@ -45,7 +45,7 @@
   }
 
   /**
+   * Overrides Drupal\views\Plugin\views\AreaPluginBase::preRender().
-   * {@inheritdoc}
    */
   public function preRender(array $results) {
     parent::preRender($results);
only in patch2:
unchanged:
--- a/core/modules/views/lib/Drupal/views/Plugin/views/HandlerBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/HandlerBase.php
@@ -274,7 +274,7 @@ public function buildOptionsForm(&$form, &$form_state) {
     // Some form elements belong in a fieldset for presentation, but can't
     // be moved into one because of the form_state['values'] hierarchy. Those
     // elements can add a #fieldset => 'fieldset_name' property, and they'll
-    // be moved to their fieldset during pre_render.
+    // be moved to their fieldset during preRender.
     $form['#pre_render'][] = 'views_ui_pre_render_add_fieldset_markup';
 
     $form['admin_label'] = array(
only in patch2:
unchanged:
--- a/core/modules/views/lib/Drupal/views/Plugin/views/PluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/PluginBase.php
@@ -184,7 +184,7 @@ public function buildOptionsForm(&$form, &$form_state) {
     // Some form elements belong in a fieldset for presentation, but can't
     // be moved into one because of the form_state['values'] hierarchy. Those
     // elements can add a #fieldset => 'fieldset_name' property, and they'll
-    // be moved to their fieldset during pre_render.
+    // be moved to their fieldset during preRender.
     $form['#pre_render'][] = 'views_ui_pre_render_add_fieldset_markup';
   }
 
only in patch2:
unchanged:
--- a/core/modules/views/lib/Drupal/views/Plugin/views/filter/FilterPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/filter/FilterPluginBase.php
@@ -493,8 +493,8 @@ public function showExposeButton(&$form, &$form_state) {
   public function buildExposeForm(&$form, &$form_state) {
     $form['#theme'] = 'views_ui_expose_filter_form';
     // #flatten will move everything from $form['expose'][$key] to $form[$key]
-    // prior to rendering. That's why the pre_render for it needs to run first,
-    // so that when the next pre_render (the one for fieldsets) runs, it gets
+    // prior to rendering. That's why the preRender for it needs to run first,
+    // so that when the next preRender (the one for fieldsets) runs, it gets
     // the flattened data.
     array_unshift($form['#pre_render'], 'views_ui_pre_render_flatten_data');
     $form['expose']['#flatten'] = TRUE;
@@ -836,8 +836,8 @@ protected function buildExposedFiltersGroupForm(&$form, &$form_state) {
     $form['#theme'] = 'views_ui_build_group_filter_form';
 
     // #flatten will move everything from $form['group_info'][$key] to $form[$key]
-    // prior to rendering. That's why the pre_render for it needs to run first,
-    // so that when the next pre_render (the one for fieldsets) runs, it gets
+    // prior to rendering. That's why the preRender for it needs to run first,
+    // so that when the next preRender (the one for fieldsets) runs, it gets
     // the flattened data.
     array_unshift($form['#pre_render'], 'views_ui_pre_render_flatten_data');
     $form['group_info']['#flatten'] = TRUE;
only in patch2:
unchanged:
--- a/core/modules/views/lib/Drupal/views/Plugin/views/sort/SortPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/sort/SortPluginBase.php
@@ -188,8 +188,8 @@ protected function sortOptions() {
 
   public function buildExposeForm(&$form, &$form_state) {
     // #flatten will move everything from $form['expose'][$key] to $form[$key]
-    // prior to rendering. That's why the pre_render for it needs to run first,
-    // so that when the next pre_render (the one for fieldsets) runs, it gets
+    // prior to rendering. That's why the preRender for it needs to run first,
+    // so that when the next preRender (the one for fieldsets) runs, it gets
     // the flattened data.
     array_unshift($form['#pre_render'], 'views_ui_pre_render_flatten_data');
     $form['expose']['#flatten'] = TRUE;
only in patch2:
unchanged:
--- a/core/modules/views/views.api.php
+++ b/core/modules/views/views.api.php
@@ -431,7 +431,7 @@ function hook_views_pre_execute(ViewExecutable &$view) {
 /**
  * Act on the view immediately after the query has been executed.
  *
- * At this point the query has been executed, but the pre_render() phase has
+ * At this point the query has been executed, but the preRender() phase has
  * not yet happened for handlers.
  *
  * Output can be added to the view by setting $view->attachment_before
@@ -455,7 +455,7 @@ function hook_views_post_execute(ViewExecutable &$view) {
 /**
  * Act on the view immediately before rendering it.
  *
- * At this point the query has been executed, and the pre_render() phase has
+ * At this point the query has been executed, and the preRender() phase has
  * already happened for handlers, so all data should be available. This hook
  * can be utilized by themes.
  *
only in patch2:
unchanged:
--- a/core/modules/views_ui/admin.inc
+++ b/core/modules/views_ui/admin.inc
@@ -258,7 +258,7 @@ function views_ui_taxonomy_autocomplete_validate($element, &$form_state) {
  *
  * Many views forms use #tree = TRUE to keep their values in a hierarchy for
  * easier storage. Moving the form elements into fieldsets during form building
- * would break up that hierarchy. Therefore, we wait until the pre_render stage,
+ * would break up that hierarchy. Therefore, we wait until the preRender stage,
  * where any changes we make affect presentation only and aren't reflected in
  * $form_state['values'].
  */