[merge from 6.7] Use equals instead of == to compare item ids (#8712). Using == will...

[merge from 6.7] Use equals instead of == to compare item ids (#8712). Using == will fail at least with JPAContainer as the entity provider provides the id instances and it is not guaranteed that the same instance is returned every time (e.g. if using a Long the longs represent the same number but are not the same instance)

svn changeset:23655/svn branch:6.8