Single argument to nested function call placed on separate line

[dirn]

Operating system: macOS
Python version: 3.7.2
Black version: 18.9b0
Does also happen on master: Yes

It looks like Black is exploding arguments to a function within another function call, regardless of whether or not the former's arguments fight onto a single line.

Original code:

text = textwrap.dedent("""
    This
    is
    some
    text.
    """.strip("\n")
)

Expected output:

text = textwrap.dedent(
    """
    This
    is
    some
    text.
    """.strip("\n")
)

Actual output:

text = textwrap.dedent(
    """
    This
    is
    some
    text.
    """.strip(
        "\n"
    )
)

P.S. In this particular case I switched to lstrip and placed it after the call to dedent, but that probably won't always be an option.

[ichard26]

Duplicate of #256.