public FieldItemListInterface::deleteRevision()
Defines custom revision delete behavior for field values.
This method is called from during the process of deleting an entity revision, just before the field values are deleted from storage. It is only called for entity types that support revisioning.
public function deleteRevision();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldItemListInterface.php/function/FieldItemListInterface::deleteRevision/8.1.x