gistfile1.js

// in comment_list.js

Session.set('comments_rendered', false);

Template.comment_list.rendered = function(){
	var numberOfComments=Comments.find({post: Session.get('selected_post_id')}).count();
	var commentsRendered=this.findAll(".comment").length;
	if(numberOfComments==commentsRendered){
		console.log(numberOfComments+" comments rendered");
		Session.set('comments_rendered', true);
	}
}



// and then in comment_item.js

Template.comment_item.rendered_class = function(){
  if(Session.get("comments_rendered")){
    // comments have already been rendered in the DOM, so queue this one instead
    return "queued";
  }
  // comments are still being rendered initially, so just display it normally
  return "opened";
};