Before 02a6e69 (#868) folding was taking too long to open python files in some cases, such as the given example below.
It would be good to implement a "regression test" to check this on the future to avoid it on the future.

class Class1:

    def __init__(self):
        super().__init__()


class Class2:

    def __init__(self):
        super().__init__()

Thanks to @jennaliu for the contribution!