Issue #3337216: DI problems

src/Plugin/Field/FieldWidget/PrivateMessageThreadMemberWidget.php

@@ -83,6 +83,13 @@ class PrivateMessageThreadMemberWidget extends EntityReferenceAutocompleteWidget
    */
   protected $keyValueStore;
 
+  /**
+   * The key/value storage collection.
+   *
+   * @var \Drupal\Core\KeyValueStore\KeyValueStoreInterface
+   */
+  protected $keyValueStore;
+
   /**
    * Constructs a PrivateMessageThreadMemberWidget object.
    *
@@ -128,8 +135,8 @@ class PrivateMessageThreadMemberWidget extends EntityReferenceAutocompleteWidget
     $this->currentUser = $currentUser;
     $this->requestStack = $requestStack;
     $this->keyValue = $key_value_factory;
-    $this->userManager = $entity_type_manager->getStorage('user');
-    $this->config = $config_factory->get('private_message.settings');
+    $this->userManager = $entityTypeManager->getStorage('user');
+    $this->config = $configFactory->get('private_message.settings');
     $this->keyValueStore = $keyValueStore;
   }