Issue #2780583 by Lendude, joachim, Nitebreed: Views field token replacement...

Issue #2780583 by Lendude, joachim, Nitebreed: Views field token replacement patterns aren't showing in area handlers admin form

core/modules/views/src/Plugin/views/area/TokenizeAreaPluginBase.php

@@ -79,7 +79,7 @@ public function tokenForm(&$form, FormStateInterface $form_state) {
           foreach ($options[$type] as $key => $value) {
             $items[] = $key . ' == ' . $value;
           }
-          $form['tokens']['tokens'] = array(
+          $form['tokens'][$type]['tokens'] = array(
             '#theme' => 'item_list',
             '#items' => $items,
           );

core/modules/views_ui/src/Tests/TokenizeAreaUITest.php

+<?php
+
+namespace Drupal\views_ui\Tests;
+
+use Drupal\entity_test\Entity\EntityTest;
+use Drupal\views\Entity\View;
+
+/**
+ * Tests the token display for the TokenizeAreaPluginBase UI.
+ *
+ * @see \Drupal\views\Plugin\views\area\Entity
+ * @group views_ui
+ */
+class TokenizeAreaUITest extends UITestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['entity_test'];
+
+  /**
+   * Test that the right tokens are shown as available for replacement.
+   */
+  public function testTokenUI() {
+    $entity_test = EntityTest::create(['bundle' => 'entity_test']);
+    $entity_test->save();
+
+    $default = $this->randomView([]);
+    $id = $default['id'];
+    $view = View::load($id);
+
+    $this->drupalGet($view->toUrl('edit-form'));
+
+    // Add a global NULL argument to the view for testing argument tokens.
+    $this->drupalPostForm("admin/structure/views/nojs/add-handler/$id/page_1/argument", ['name[views.null]' => 1], 'Add and configure contextual filters');
+    $this->drupalPostForm(NULL, [], 'Apply');
+
+    $this->drupalPostForm("admin/structure/views/nojs/add-handler/$id/page_1/header", ['name[views.area]' => 'views.area'], 'Add and configure header');
+    // Test that field tokens are shown.
+    $this->assertText('{{ title }} == Content: Title');
+    // Test that argument tokens are shown.
+    $this->assertText('{{ arguments.null }} == Global: Null title');
+  }
+
+}