Collapse plugin does not correctly set the "collapsed" class on accordion heading links

Created by: dynamicdan

This line:

$this[$(target).hasClass('in') ? 'addClass' : 'removeClass']('collapsed')

Only works to remove or add the collapsed class on the element clicked. It does not updated the element that was previously expanded/clicked. So the class usage becomes inconsistent quickly and stops me easily styling stuff.

Note diff b/w accordion-heading and accordion-body.