Issue #2245721 by vijaycs85, YesCT: Add missing configuration schema in language component.

core/modules/language/config/schema/language.schema.yml

@@ -106,3 +106,32 @@ language.entity.*:
     langcode:
       type: string
       label: 'Default language'
+
+language.settings:
+  type: mapping
+  label: 'Language settings'
+  mapping:
+    entities:
+      type: sequence
+      label: 'Entity type'
+      sequence:
+        - type: sequence
+          label: 'Bundle'
+          sequence:
+            - type: mapping
+              label: 'Custom language settings'
+              mapping:
+                language:
+                  type: mapping
+                  label: 'Custom language settings'
+                  mapping:
+                    default_configuration:
+                      type: mapping
+                      label: 'Default language'
+                      mapping:
+                        langcode:
+                          type: string
+                          label: 'Default language'
+                        language_show:
+                          type: boolean
+                          label: 'Show language selector on create and edit pages'

core/modules/language/language.module

@@ -348,7 +348,7 @@ function language_get_default_configuration_settings_key($entity_type, $bundle)
   // Replace all the characters that are not letters, numbers or "_" with "_".
   $entity_type = preg_replace('/[^0-9a-zA-Z_]/', "_", $entity_type);
   $bundle = preg_replace('/[^0-9a-zA-Z_]/', "_", $bundle);
-  return $entity_type . '.' . $bundle . '.language.default_configuration';
+  return 'entities.' . $entity_type . '.' . $bundle . '.language.default_configuration';
 }
 
 /**

core/modules/language/lib/Drupal/language/Tests/LanguageConfigSchemaTest.php

@@ -0,0 +1,78 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\language\Tests\LanguageConfigSchemaTest.
+ */
+
+namespace Drupal\language\Tests;
+
+use Drupal\config\Tests\ConfigSchemaTestBase;
+
+/**
+ * Tests the language config schema.
+ */
+class LanguageConfigSchemaTest extends ConfigSchemaTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('language');
+
+  /**
+   * A user with administrative permissions.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $adminUser;
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Language config schema',
+      'description' => 'Ensures the language config schema is correct.',
+      'group' => 'Language',
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  function setUp() {
+    parent::setUp();
+
+    // Create user.
+    $this->adminUser = $this->drupalCreateUser(array('administer languages'));
+    $this->drupalLogin($this->adminUser);
+  }
+
+  /**
+   * Tests whether the language config schema is valid.
+   */
+  function testValidLanguageConfigSchema() {
+    // Make sure no language configuration available by default.
+    $config_data = \Drupal::config('language.settings')->get();
+    $this->assertTrue(empty($config_data));
+
+    $settings_path = 'admin/config/regional/content-language';
+
+    // Enable translation for menu link.
+    $edit['entity_types[menu_link]'] = TRUE;
+    $edit['settings[menu_link][menu_link][settings][language][language_show]'] = TRUE;
+
+    // Enable translation for user.
+    $edit['entity_types[user]'] = TRUE;
+    $edit['settings[user][user][settings][language][language_show]'] = TRUE;
+    $edit['settings[user][user][settings][language][langcode]'] = 'en';
+
+    $this->drupalPostForm($settings_path, $edit, t('Save'));
+
+    $config_data = \Drupal::config('language.settings')->get();
+    // Make sure configuration saved correctly.
+    $this->assertTrue($config_data['entities']['menu_link']['menu_link']['language']['default_configuration']['language_show']);
+
+    $this->assertConfigSchema(\Drupal::service('config.typed'), 'language.settings', $config_data);
+  }
+
+}

core/modules/node/node.install

@@ -460,7 +460,8 @@ function node_uninstall() {
   foreach ($types as $config_name) {
     $type = \Drupal::config($config_name)->get('type');
     if (\Drupal::moduleHandler()->moduleExists('language')) {
-      \Drupal::config('language.settings')->clear('node. ' . $type . '.language.default_configuration')->save();
+      $key = language_get_default_configuration_settings_key('node', $type);
+      \Drupal::config('language.settings')->clear($key)->save();
     }
   }