def add(self, child, z=0, name=None):
        super(ScrollingManager, self).add(child, z=z, name=name)
        # set the focus again and force it so we don't just skip because the
        # focal point hasn't changed
        self.set_focus(self.fx, self.fy, force=True)
Queries for old tasks and removes the entity which tells
dataset/ETHPy150Open los-cocos/cocos/cocos/layer/scrolling.py/ScrollingManager.add--crossover with--dataset/ETHPy150Open AppScale/appscale/AppDB/groomer.py/DatastoreGroomer.remove_old_tasks_entities