Formatter undocumented deviation: No blank line added between decorated inner classes in pyi files

[henribru]

class Foo:
    @foo
    class Bar: ...
    @foo
    class Baz: ...

With default settings (no settings in pyproject.toml) ruff format . leaves this code unchanged. black . adds an empty line between the two inner classes. Reproduced with Ruff 0.1.6 and Black 23.11.0.

Unfortunately I can't give you a playground reproduction for Ruff since it assumes files are .py, but here's one for Black as its playground supports it: https://black.vercel.app/?version=stable&state=_Td6WFoAAATm1rRGAgAhARYAAAB0L-Wj4ACqAGFdAD2IimZxl1N_WlXnON2nzNX9HFvHx6cBLwL3Qwwh1eRAPLFFFWljgvmpOKOffkrecPNUT9AKbB5TWcHByQZl7G4uT9jIT7lav7JhqiztyvUmJIr2-kI3P8tLXaxrmogstgAAAAAANPCqLcjD5SoAAX2rAQAAACADosuxxGf7AgAAAAAEWVo=

[charliermarsh]

Interesting! They don't add a newline between decorated functions, but do add a newline between decorated classes. Thanks for reporting.

[charliermarsh]

I'm wondering if this is intentional or a bug in Black.

[charliermarsh]

Mostly because it's not that consistent between functions and classes: https://black.vercel.app/?version=stable&state=_Td6WFoAAATm1rRGAgAhARYAAAB0L-Wj4AFyAIFdAD2IimZxl1N_WlXnON2nzNX9HFvHx6cBLwL3Qwwh1eRAPLFFFWljgvmpPX9pLqTnCMqdh3N3EyMEBEzXO-2vBynVUJMtmULtassHbhRrn1oJcaBh0ocW84sbYX4q7g1ul3plgihpMni7ANfRx9SPRrj7QHiDkG4Yihi-PnL71L5GAAAAAACFb5eQO-sQawABnQHzAgAA15WayLHEZ_sCAAAAAARZWg==