def filter(self, table, stacks, filter_string):
        query = filter_string.lower()
        return [stack for stack in stacks
                if query in stack.name.lower()]
Diagonal line in two possible directions; either bottomUp or topDown.
dataset/ETHPy150Open openstack/horizon/openstack_dashboard/dashboards/project/stacks/tables.py/StacksFilterAction.filter--crossover with--dataset/ETHPy150Open adobe-type-tools/box-drawing/boxDrawing.py/diagonal