+ for long line functions with params keep long lines

[tbicr]

+ for long line functions with params keep long lines with line-length = 100 parameter:

def xxx(p123456789):
    r123456789 = a123456789012345678901234567890123456789() + b1234567890123456789012345678901234567890123(
        p123456789
    )

expect that next code will not be reformatted:

def xxx(p123456789):
    r123456789 = (
        a123456789012345678901234567890123456789()
        + b1234567890123456789012345678901234567890123(p123456789)
    )

Howdy! Sorry you're having trouble. To expedite your experience,
provide some basics for me:

Operating system: Ubuntu 16.04.6 LTS
Python version: 3.7.3
Black version: 19.3b, master
Does also happen on master: yes

To answer the last question, you have two options:

1. Use the online formatter at https://black.now.sh/?version=master, which will use the latest master branch.
2. Or run black on your machine:
   • create a new virtualenv (make sure it's the same Python version);
   • clone this repository;
   • run pip install -e .;
   • make sure it's sane by running python setup.py test; and
   • run black like you did last time.

[JelleZijlstra]

I had some trouble understanding the complaint but I do think there's a bug here. Given this code:

def xxx(p123456789):
    r123456789 = a123456789012345678901234567890123456789() + b1234567890123456789012345678901234567890123(
        p123456789
    )

Calling Black on it with no arguments produces the second code sample above. But black -l 100 leaves it unchanged, even though the second line exceeds 100 characters.

[JelleZijlstra]

My comment above no longer reproduces

% black -l 100 -c '''def xxx(p123456789):
    r123456789 = a123456789012345678901234567890123456789() + b1234567890123456789012345678901234567890123(
        p123456789
    )
'''
def xxx(p123456789):
    r123456789 = (
        a123456789012345678901234567890123456789()
        + b1234567890123456789012345678901234567890123(p123456789)
    )