.../Plugin/Field/FieldWidget/AuthorAutocompleteWidget.php |  3 ---
 .../Field/FieldWidget/RouteBasedAutocompleteWidget.php    | 12 +++++++++---
 .../Field/Plugin/Field/FieldWidget/TimestampWidget.php    | 14 ++++++++++----
 core/modules/node/lib/Drupal/node/NodeForm.php            | 15 ++++++++-------
 .../text/Plugin/Field/FieldWidget/TextareaWidget.php      |  4 ----
 5 files changed, 27 insertions(+), 21 deletions(-)

diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/AuthorAutocompleteWidget.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/AuthorAutocompleteWidget.php
index 560cfb1..4cff988 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/AuthorAutocompleteWidget.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/AuthorAutocompleteWidget.php
@@ -18,9 +18,6 @@
  *   label = @Translation("Author user reference autocomplete"),
  *   field_types = {
  *     "entity_reference",
- *   },
- *   settings = {
- *     "route_name" = "",
  *   }
  * )
  */
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/RouteBasedAutocompleteWidget.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/RouteBasedAutocompleteWidget.php
index 40ed80b..cf8b2c3 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/RouteBasedAutocompleteWidget.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/RouteBasedAutocompleteWidget.php
@@ -18,9 +18,6 @@
  *   label = @Translation("Entity reference autocomplete (route-based)"),
  *   field_types = {
  *     "entity_reference",
- *   },
- *   settings = {
- *     "route_name" = "",
  *   }
  * )
  */
@@ -29,6 +26,15 @@ class RouteBasedAutocompleteWidget extends WidgetBase {
   /**
    * {@inheritdoc}
    */
+  public static function defaultSettings() {
+    return array(
+      'route_name' => '',
+    ) + parent::defaultSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, array &$form_state) {
     $element['target_id'] = $element + array(
       '#type' => 'textfield',
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/TimestampWidget.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/TimestampWidget.php
index 1d27fe7..a309a9b 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/TimestampWidget.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/TimestampWidget.php
@@ -20,10 +20,7 @@
  *   field_types = {
  *     "timestamp",
  *     "created",
- *   },
- *   settings = {
- *     "use_request_time_on_empty" = FALSE,
- *   },
+ *   }
  * )
  */
 class TimestampWidget extends WidgetBase {
@@ -31,6 +28,15 @@ class TimestampWidget extends WidgetBase {
   /**
    * {@inheritdoc}
    */
+  public static function defaultSettings() {
+    return array(
+      'use_request_time_on_empty' => FALSE
+    ) + parent::defaultSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, array &$form_state) {
     $default_value = isset($items[$delta]->value) ? format_date($items[$delta]->value, 'custom', 'Y-m-d H:i:s O') : '';
     $element['value'] = $element + array(
diff --git a/core/modules/node/lib/Drupal/node/NodeForm.php b/core/modules/node/lib/Drupal/node/NodeForm.php
index 2e78d37..3ab5810 100644
--- a/core/modules/node/lib/Drupal/node/NodeForm.php
+++ b/core/modules/node/lib/Drupal/node/NodeForm.php
@@ -55,6 +55,14 @@ public function form(array $form, array &$form_state) {
     /** @var \Drupal\node\NodeInterface $node */
     $node = $this->entity;
 
+    // Create the "advanced" vertical tabs before building the form, so that
+    // field widgets may detect its presence and choose to live there.
+    $form['advanced'] = array(
+      '#type' => 'vertical_tabs',
+      '#attributes' => array('class' => array('entity-meta')),
+      '#weight' => 99,
+    );
+
     $form = parent::form($form, $form_state, $node);
 
     if ($this->operation == 'edit') {
@@ -90,13 +98,6 @@ public function form(array $form, array &$form_state) {
       '#default_value' => $node->getUntranslated()->language()->id,
       '#languages' => Language::STATE_ALL,
       '#access' => isset($language_configuration['language_show']) && $language_configuration['language_show'],
-     );
-
-
-    $form['advanced'] = array(
-      '#type' => 'vertical_tabs',
-      '#attributes' => array('class' => array('entity-meta')),
-      '#weight' => 99,
     );
 
     // Add a log field if the "Create new revision" option is checked, or if
diff --git a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldWidget/TextareaWidget.php b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldWidget/TextareaWidget.php
index 8474b2b..1b41a93 100644
--- a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldWidget/TextareaWidget.php
+++ b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldWidget/TextareaWidget.php
@@ -20,10 +20,6 @@
  *   field_types = {
  *     "text_long",
  *     "string_long",
- *   },
- *   settings = {
- *     "rows" = "5",
- *     "placeholder" = ""
  *   }
  * )
  */