Failing Test (since commit 53a5a48aed7d87aa1533c0bcbd72e41b686527d8)

Hi,

It seems to be a regression since the commit https://github.com/doctrine/doctrine2/commit/53a5a48aed7d87aa1533c0bcbd72e41b686527d8

Doctrine\ORM\PersistentCollection can be populated in $changeSet if you set a PreUpdate and PostUpdate event.

Original issue: http://www.doctrine-project.org/jira/browse/DDC-3033