Major indentation failure when # fmt: off falls out of scope

[rwarren]

Black v19.3b0

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--line-length=89

Input

def bar():
    # fmt: off
    x=1

y=2

Output

def bar():
    # fmt: off
    x=1

    y = 2

Expected

def bar():
    # fmt: off
    x=1

y = 2

This seems somewhat related to #884, but this is a concise case.

This is a major bug since it actually changes the resulting code significantly.

[rwarren]

In case it wasn't obvious, the problem is that the y = 2 line got moved into the function (!!).

[zsol]

This seems like the same case as #569, let's keep the discussion there