Formatting document is inconsistent between ruff and air

Originally posted by @juliasilge in https://github.com/quarto-dev/quarto/pull/754#pullrequestreview-3688360799:

I'm supportive of us merging this because it gives us an improvement, but I want to highlight a difference in results between very similar formatters, when you use Format Document.

If you have settings like this:

{
    "[python]": {
        "editor.defaultFormatter": "charliermarsh.ruff"
    },
    "[r]": {
        "editor.defaultFormatter": "Posit.air-vscode"
    },
    "[quarto]": {
        "editor.defaultFormatter": "quarto.quarto"
    }
}

And two .qmd files like this:

---
title: "Untitled"
format: html
---

```{python}
1 + 1
```


Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.

```{python}
from typing import Iterable

import os


def sum_even_numbers(numbers: Iterable[int]) -> int:
    """Given an iterable of integers, return the sum of all even numbers in the iterable."""
    return sum(
        num for num in numbers
        if num % 2 == 0
    )
```

Second one:

---
title: "Untitled"
format: html
---

```{r}
1 + 1
```


Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.

```{r}
list(foobar, foobar, foobar, foobar, foobar, foobar, foobar, foobar, foobar, foobar, foobar, foobar)
```

• Put your cursor in the 1 + 1 code cell
• Run Format Document
• In the R file, the other code cell will get formatted, which is what I would argue is the correct behavior
• In the Python file, the other code cell not get formatted, which I think is not right

If you run Format Document from the code cell that needs formatting, the behavior is the same for both; it does format that code cell. The command Quarto: Format Cell also works well for both files.

We can log this problem to follow up on.

Reproduce the two .qmd examples in VS Code with the listed formatter settings, comparing Format Document from a code cell with Quarto: Format Cell. Trace the document-formatting paths for Python and R to identify why Ruff does not format the other cell; done means the Python document matches the R behavior while both existing commands continue to work.