in server/src/main/resources/twitter-server/js/threads.js [16:27]
$('.' + stackTraceRowClass).each(function() {
var stackDomId = $(this).attr('id');
var isIdle = $(this).hasClass(idleThreadStackClass);
if (idleShown || !isIdle) {
stackOnOff[stackDomId] = isOn;
if (isOn)
$(this).show();
else
$(this).hide();
}
});