Concurrent edits may break page consistency

[tteofili]

When using Confluence FISE plugin if one user tries to edit a page and then one other user tries to edit the same page, even if the latter clicks cancel the FISE plugin is executed leading to a :

caused by: net.sf.hibernate.LazyInitializationException: cannot access loading collection
at net.sf.hibernate.collection.PersistentCollection.initialize(PersistentCollection.java:191)

The resolution is in handling correct events instead of generic Page/BlogEvent