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DDC-875: Merge can sometimes add the same entity twice into a collection #1083
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Originally created by @doctrinebot on GitHub (Nov 11, 2010).
Jira issue originally created by user ccapndave:
When merging some cascade merge object-graphs, the same entity in a ManyToMany association can be put into a collection twice during doMerge.
The attached patch should stop this from happening.