blank_line_after_nested_stub_class: blank line got added after a nested class with ...

[dhruvmanila]

Describe the bug

The preview style description says that the blank line won't be added if the body contains only ..., but it seems that Black is adding an empty line nevertheless.

To Reproduce

For example, take this code:

class Top:
    class Nested1: ...
    class Nested2:
        pass

And run it with these arguments:

$ black file.py

The resulting code is:

class Top:
    class Nested1: ...

    class Nested2:
        pass

Expected behavior

There shouldn't be a blank line after Nested1 as it only contains an ellipsis (...).

Environment

• Black's version: 24.1a1
• OS and Python version: MacOS/Python 3.11.3

Additional context

For reference, Black playground.

Please correct me if I'm misinterpreting the preview style.

[JelleZijlstra]

My intuition is that there should be a blank line because there is a nontrivial class after.

[JelleZijlstra]

Closing per my above comment.