core/modules/ckeditor/src/Plugin/CKEditorPlugin/Internal.php | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/core/modules/ckeditor/src/Plugin/CKEditorPlugin/Internal.php b/core/modules/ckeditor/src/Plugin/CKEditorPlugin/Internal.php
index ecaff54..ba875b9 100644
--- a/core/modules/ckeditor/src/Plugin/CKEditorPlugin/Internal.php
+++ b/core/modules/ckeditor/src/Plugin/CKEditorPlugin/Internal.php
@@ -8,6 +8,7 @@
 namespace Drupal\ckeditor\Plugin\CKEditorPlugin;
 
 use Drupal\ckeditor\CKEditorPluginBase;
+use Drupal\ckeditor\CKEditorPluginContextualInterface;
 use Drupal\Component\Utility\NestedArray;
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Cache\CacheBackendInterface;
@@ -24,7 +25,7 @@
  *   label = @Translation("CKEditor core")
  * )
  */
-class Internal extends CKEditorPluginBase implements ContainerFactoryPluginInterface {
+class Internal extends CKEditorPluginBase implements ContainerFactoryPluginInterface, CKEditorPluginContextualInterface {
 
   /**
    * The cache backend.
@@ -84,6 +85,15 @@ public function isInternal() {
   /**
    * {@inheritdoc}
    */
+  public function isEnabled(Editor $editor) {
+    // This plugin represents the core CKEditor plugins. They're always enabled:
+    // its configuration is always necessary.
+    return TRUE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function getFile() {
     // This plugin is already part of Drupal core's CKEditor build.
     return FALSE;