hydrateAdd does not update originalEntityData

Step to reproduce :

1) create Two entity with bidirectionnal oneToMany association.

ex :
Client (id, name | emails)
Email(id, email, client_id | clients)

Email is the owning side.

2) Do a query using both entity
$qb->select('client', 'emails')
->from('Client', 'client')
->leftJoin('client.emails', 'emails')
->where(...);
$query = $qb->getQuery();
$client = $query->getSingleResult();
$em->flush();

3) If you set listener on onUpdate event, you will notice that the Email entity is updated.

I looked deep into UnitOfWork and ObjectHydrator and I see that the originalEntityData (used to calculate modified data before update) is saved before the manyToMany relation is set by a call to hydrateAdd (ObjectHydrator line 322)

In my previously bug report : DDC-139, I tought I had to check if an entity have changed in the onUpdate. Now, I see that entity are wrongly updated.

I can provide a more detailled test case if you need more informations.

Thank you