Developer credits
Git commits in Moodle 2.2.3 by Tim Lock
commit da496c52f8150eaa7a3bb25d614cc1ae9f5bd7d0 Author: Tim Lock <tim.lock@netspot.com.au> Date: Mon, 05 Mar 2012 09:48:58 +0800 Tag: v2.2.3 MDL-31869: Searching for users in messaging with multiple roles generates a warning