Merging entities that contained unloaded proxy collections will delete those associations

Forgot to tell trunk revision

This issue is mainly caused by the entity not being initialized before serialization. Additionally, the PersistenCollection does loose all information that is needed to regain the kept entities because the collection itself is not initialized before serialization.

I've added an initialization call here http://github.com/Shurakai/doctrine2/commit/6c185a2891111dfbd83d381bad8c5a2b16536cad#diff-0

However, I'm not sure whether this is the best solution. Any thoughts?

@Christian: I looked at the testcase you committed there and the assumptions it makes are not correct. The original test case provided by Markus made the right assumptions, that is, after the user is unserialized it can and should not know about its groups or phonenumbers since these were not serialized.
When you serialize an entity, you serialize a partial snapshot of its state. When you unserialize it you have all the state that was loaded prior to serialization but you can not get at the rest, the object is detached from the rest of the object graph. Thats where merge() comes in, it reattaches a detached entity to a managed environment where associations can be lazy-loaded, state changes are tracked, etc.

So the problem must come later, at the point of merging.

Pushing back to beta3.

Fixed.