Rework reformatting in PyProjectTomlMut to respect original indentation

[flyaroundme]

Summary

So this PR introduces change to how Array of dependencies representation is reformatted while PyProjectTomlMut is manipulated. These changes are here for it to respect the original indentation.
Closes #5009

Test Plan

Using pyproject.toml like

[project]
name = "project"
version = "0.1.0"
requires-python = ">=3.12"
dependencies = [
  "requests"
]

Executed

$ uv add httpx

And expected in pyproject.toml

[project]
name = "project"
version = "0.1.0"
requires-python = ">=3.12"
dependencies = [
  "requests",
  "httpx",
]

Preserving original indentation

[ibraheemdev]

Thanks for doing this!

Can we add a test to ensure this is working as expected? You can see https://github.com/astral-sh/uv/blob/main/crates/uv/tests/edit.rs#L14 for an example (you can probably omit the part checking uv.lock).

[flyaroundme]

Thanks for doing this!

Can we add a test to ensure this is working as expected? You can see https://github.com/astral-sh/uv/blob/main/crates/uv/tests/edit.rs#L14 for an example (you can probably omit the part checking uv.lock).

Sure, will do

[flyaroundme]

Updated, please re-review 🙏

[ibraheemdev]

Hmm I'm a little unclear how this works if the line doesn't have a comment?

[flyaroundme]

If the decor.prefix() does not have a comment this whole expression will return the String that is in decor.prefix() trimmed by "\n" from the left

[flyaroundme]

If you're asking about this particular line

.map(|s| s.split('#').next().unwrap_or("").to_string())

in case there is no '#' in the string it well return the whole string

[ibraheemdev]

Ah that makes sense.

[ibraheemdev]

Nice work!