PEP 604 type hints in a class definition are not broken up when hitting the line length limit

[mmohrhard]

I have checked with the online formatter that it is not fixed in the most up to date development branch.

Describe the bug

The following code has a line that is longer than 88 characters and yet is not split by black:

class LongNameLongName:
    pass


class LongNameLongName2:
    pass


class LongNameLongName3:
    pass


class LongNameLongName4:
    pass


class LongNameLongName5:
    pass


class LongNameLongName6:
    pass


class ClassWithTypeDefs:
    name: str
    field: LongNameLongName | LongNameLongName2 | LongNameLongName3 | LongNameLongName4 | LongNameLongName5 | LongNameLongName6


def func(
    a: LongNameLongName
    | LongNameLongName2
    | LongNameLongName3
    | LongNameLongName4
    | LongNameLongName5
    | LongNameLongName6,
):
    pass

As can be seen, for a function black breaks the typing statement into multiple lines but not for the class definition.

$ flake8 --max-line-length 88 test.py
test.py:27:89: E501 line too long (127 > 88 characters)
$ black -l 88 -t py311 test.py
All done! ✨ 🍰 ✨
1 file left unchanged.

Expected behavior

black should break the line or at least not reformat the code to a line longer than the line width limit if the line was broken up before.

Environment

Linux
$ black --version
black, 23.7.0 (compiled: no)
Python (CPython) 3.11.4

[jakkdl]

This gets wrapped with parentheses and no longer breaks the line length after #3899, and can be closed.

[JelleZijlstra]

Indeed

% black --preview -c '''class ClassWithTypeDefs:
    name: str
    field: LongNameLongName | LongNameLongName2 | LongNameLongName3 | LongNameLongName4 | LongNameLongName5 | LongNameLongName6
'''
class ClassWithTypeDefs:
    name: str
    field: (
        LongNameLongName
        | LongNameLongName2
        | LongNameLongName3
        | LongNameLongName4
        | LongNameLongName5
        | LongNameLongName6
    )