Formatter: single_line_format_skip_with_multiple_comments preview style

[MichaReiser]

Implement Black's single_line_format_skip_with_multiple_comments style in Ruff.

I don't think it's necessary to gate this change as a preview style. We should also allow the same for fmt:off and fmt:on.

# fmt:skip                           <-- single comment
# noqa:XXX # fmt:skip # a nice line  <-- multiple comments (Preview)
# pylint:XXX; fmt:skip               <-- list of comments (; separated, Preview)

[charliermarsh]

I don't mind requiring a # to delimit each pragma -- we already have this requirement in the linter IIRC.

[zanieb]

I like the ; delimiter for pragmas, I think # is pretty awkward.

[charliermarsh]

I find # more intuitive.

[zanieb]

:D Are you suggesting that we should not support using ;?

[charliermarsh]

I don't feel strongly about supporting it but I probably wouldn't recommend it. We have to use something here that all tools adhere to, and # is likely the most universal and portable.

[georgettica]

for me, the big addition is I can explain in the same comment I am skipping the formatting what led me to this

also, I am against the ; as its a new delimiter, and # is that we have and use now

[MichaReiser]

Thanks @charliermarsh for implementing this.

Allowing # is a good first step. Supporting ; or : is something that we may want to support in the future. For example, Biome has a standardized format for specifying the reason using biome-ignore rule: <reason>. Standardizing the format has the advantage that downstream tools (e.g., a dashboard) can use the explanation.

I recommend deferring this until we look into suppression comments holistically.