Address autopep8 overriding pycodestyle's continued_indentation

[johnhany97]

Before this PR

Given a Python file like:

def hello():
    print("Python", ("Hello",
                                     "World"))

The diagnostics report of pycodestyle is:

[{'source': 'pycodestyle', 'range': {'start': {'line': 2, 'character': 37}, 'end': {'line': 2, 'character': 47}}, 'message': 'E127 21', 'code': 'E127', 'severity': 2}]

Root cause & Description

While the error code, E127, is expected, this is not the expected error message.
This is because autopep8 overrides pycodestyle's implementation of continued_indentation which is the check used to determine this error code, among others. autopep8's implementation however returns a different thing than what we expect out of the pycodestyle implementation, leading to a scenario where the diagnostics report contains an unuseful error message.

After this PR

The output is as expected:

[{'source': 'pycodestyle', 'range': {'start': {'line': 2, 'character': 37}, 'end': {'line': 2, 'character': 47}}, 'message': 'E127 continuation line over-indented for visual indent', 'code': 'E127', 'severity': 2}]

[ccordoba12]

Thanks @johnhany97!

[afflux]

Unfortunately, this change breaks formatting when a document has continuation lines.

Try formatting this:

def foo():
    print('asdf',
    file=None
    )