code: function update(){
  			var y      = 0;
  			var height = 0;
  			var i      = 0;
  			var l      = folds.length;
  			var parentFold = THIS.parentFold;
  			var fold, diff;
  			
  			for(; i < l; ++i){
  				fold   = folds[i];
  				fold.y = y;
  				fold.fit();
  				y      += fold.height;
  				height += fold.height;
  			}
  			
  			diff = height - _height;
  			parentFold
  				? (parentFold.open && THIS.parent.updateFold(parentFold, diff))
  				: edgeCheck(diff);
  			
  			THIS.height = height;
  		}
docs: Update the height of each fold to fit its content.