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Improve comments around Arguments handling in classes (#6310)

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## Summary

Based on the confusion here:
https://github.com/astral-sh/ruff/pull/6274#discussion_r1282754515.

I looked into moving this logic into `placement.rs`, but I think it's
trickier than it may appear.
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Charlie Marsh 2023-08-03 12:34:03 -04:00 • committed by GitHub
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commit b3f3529499
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32
crates/ruff_python_formatter/src/statement/stmt_class_def.rs
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@ -64,28 +64,48 @@ impl FormatNodeRule<StmtClassDef> for FormatStmtClassDef {
}
if let Some(arguments) = arguments.as_deref() {
// Drop empty parentheses, e.g., in:
// Drop empty the arguments node entirely (i.e., remove the parentheses) if it is empty,
// e.g., given:
// ```python
// class A():
// ...
// ```
//
// However, preserve any dangling end-of-line comments, e.g., in:
// Format as:
// ```python
// class A:
// ...
// ```
//
// However, preserve any dangling end-of-line comments, e.g., given:
// ```python
// class A( # comment
// ):
// ...
//
// If the arguments contain any dangling own-line comments, we retain the parentheses,
// e.g., in:
// Format as:
// ```python
// class A: # comment
// ...
// ```
//
// However, the arguments contain any dangling own-line comments, we retain the
// parentheses, e.g., given:
// ```python
// class A( # comment
// # comment
// ):
// ...
// ```
if arguments.args.is_empty()
&& arguments.keywords.is_empty()
//
// Format as:
// ```python
// class A( # comment
// # comment
// ):
// ...
// ```
if arguments.is_empty()
&& comments
.dangling_comments(arguments)
.iter()