Developer credits
Git commits in Moodle 2.5.3 by Juan Leyva
commit 119faec0546c34a8a55085adf4ed0e5140cda8ff Author: Juan Leyva <juanleyvadelgado@gmail.com> Date: Thu, 31 Oct 2013 18:18:24 +0800 Tag: v2.5.3 MDL-42617 Add support for frozen fields in searchableselector form elements