def fetchMore(self, index):
        logger.debug(
            'TaskTreeModel.canFetchMore() is started for index: %s' % index)
        if index.isValid():
            item = self.itemFromIndex(index)
            item.fetchMore()
        logger.debug(
            'TaskTreeModel.canFetchMore() is finished for index: %s' % index)
fetches more elements
dataset/ETHPy150Open eoyilmaz/anima/anima/ui/models.py/TaskTreeModel.fetchMore