Bug Report

scheduledForSynchronization not erases when no changes on the flush.

Summary

I use DEFERRED_EXPLICIT policy for entities in my app. And app crashes with out of memory error during batch processing. Because scheduledForSynchronization keeps references to entities when no changes for commit:

In this case UnitOfWork::postCommitCleanup() not called.

How to reproduce

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity()
 * @ORM\ChangeTrackingPolicy("DEFERRED_EXPLICIT")
 */
class Entity
{
}

$entity = $em->find(Entity::class, 123);

$em->persist($entity);
$em->flush();
$em->detach($entity);

var_dump($em->getUnitOfWork()->size()); // int(0)
var_dump($em->getUnitOfWork()->isScheduledForDirtyCheck($entity)); // bool(true)

Was expected that isScheduledForDirtyCheck() return false after commit (flush) in any case.