Add --skip-magic-trailing-comma to formatter dev comment

[konstin]

Testing the compatibility with the future stable black style, i realized the ruff_python_formatter dev main was lacking the --skip-magic-trailing-comma option. This does not affect ruff format.

Usage:

cargo run --bin ruff_python_formatter -p ruff_python_formatter -- --skip-magic-trailing-comma --emit stdout scratch.py

[github-actions]

ruff-ecosystem results

Formatter (stable)

✅ ecosystem check detected no format changes.

Formatter (preview)

✅ ecosystem check detected no format changes.

[Apreche]

Right now whenever I run ruff format with version 0.1.5, it's behaving as if skip_magic_trailing_comma = true even though the default is supposed to be false. It's really annoying to put in a bunch of newlines and then have them blown away to make one long line.

Does this fix that issue?

[charliermarsh]

@Apreche - This is just an internal development command for Ruff so it shouldn't affect your production setup. Can you give an example of code that's being reformatted?

[Apreche]

I investigated, and it was my mistake. No issues. Sorry about that.