def increase_version(self):
        refresh = False
        self.version += 1
        self.data.increase_version()
        if self.version - self.data.version != 0:
            self.refresh()  # when does that happen?
            self.version = self.data.version
            refresh = True
        return refresh
dataset/ETHPy150Open Net-ng/kansha/kansha/board/comp.py/Board.increase_version/swapped operands of `-`