'collapsed' class should be added to all triggers, not just the one that initiates the collapse
Created by: jkallay1
When an element is collapsed, the 'collapsed' class should be added to all collapse triggers for that element, not just the one that triggered the collapse. An example use case is where one trigger is used for showing, the other for hiding.
Test case is here. http://jsfiddle.net/G8kRu/5/