jquery/jquery-mobile — pull request #4295 by jasondscott (2012-05-05 02:38:55+00:00)
Title: Fixes 4196 - Collapsibles nested in an accordion set are always treated as accordions

How fixed: Checked if the closest parent is a collapsible-set before triggering the collapse event.

How tested: http://jsbin.com/omacox/100 and Docs