Formatter: Unstable call arguments comment formatting

[MichaReiser]

I created this example to test some edge cases with #6817. That PR is handling the edge case correctly but I can't add the test case because the call expression formatting with the following comment itself is unstable

aaa = (
    bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
    # awkward comment
    ()
    .bbbbbbbbbbbbbbbb
)


aaa = bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb# awkward comment
().bbbbbbbbbbbbbbbb

Playground

[charliermarsh]

@MichaReiser - Want me to look at this, or are you taking as part of #6817?

[MichaReiser]

@MichaReiser - Want me to look at this, or are you taking as part of #6817?

I'm not solving it. I used a different test case to work around the issue.

[charliermarsh]

I'm thinking that I'll just make that a leading comment on bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb.

[MichaReiser]

Prettier makes it a leading comment of what comes after Playground. You have to be careful with comment ordering if you make it a leading comment of bbb, e.g if bbb has some trailing comments too

[charliermarsh]

I need to understand why we break the latter but not the former:

aaa = (
    bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
    # awkward comment
    ()
    .bbbbbbbbbbbbbbbb
)

aaa = (
    bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
    ()
    # awkward comment
    .bbbbbbbbbbbbbbbb
)

[MichaReiser]

Attribute formatting has special handling for leading comments of the next attribute

ruff/crates/ruff_python_formatter/src/expression/expr_attribute.rs

Lines 113 to 117 in 0cea497

	(!leading_attribute_comments.is_empty()).then_some(hard_line_break()),
	leading_comments(leading_attribute_comments),
	text("."),
	trailing_comments(trailing_dot_comments),
	attr.format()