+ /**
+ * Determines whether the field has relevant changes.
+ *
+ * This is for example used to determine if a revision of an entity has
+ * changes in a given translation. Unlike
+ * \Drupal\Core\Field\FieldItemListInterface::equals(), this can report
+ * that for example an untranslatable field, despite being changed and
+ * therefore technically affecting all translations, is only internal metadata
+ * or only affects a single translation.
+ *
+ * @param \Drupal\Core\Field\FieldItemListInterface $original_items
+ * The original field items to compare against.
+ * @param string $langcode
+ * The language that should be checked.
+ *
+ * @return bool
+ * TRUE if the field has relevant changes, FALSE if not.
+ */
+ public function hasAffectingChanges(FieldItemListInterface $original_items, $langcode);
+