@classmethod
    def add_item(c, name, item):
        if isinstance(item, MenuItem):
            if name not in c.items:
                c.items[name] = []
            c.items[name].append(item)
            c.sorted[name] = False
Remove a tab from front of lines but allowing dedented lines.
dataset/ETHPy150Open borgstrom/django-simple-menu/menu/menu.py/Menu.add_item--crossover with--dataset/ETHPy150Open darcyliu/storyboard/markdown/blockprocessors.py/BlockProcessor.looseDetab