civicrm/civicrm-core — pull request #3501 by jmcclelland (2014-06-16 18:47:28+00:00)
Title: CRM-14865 - prevent duplicate participant records when added offline.

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* CRM-14865: Prevent duplicate participants when using offline event registration
https://issues.civicrm.org/jira/browse/CRM-14865