Fix remaining issues with array newlines and equal sign spaces

[DevinR528]

Well, this fixes all the issues, I think. If you think this is reasonable, I would just add docs in the readme about the two new tomlfmt options (max_array_line_len and indent_count) and it's ready to go. I could add the docs to the readme and it probably won't take me a whole year haha.

[jplatte]

Hm, I think Ruma never explicitly opted into formatting, just sorting. Is it on by default? Running cargo sort --workspace --grouped --order package,lib,features,dependencies,target,dev-dependencies,build-dependencies in Ruma with the crates.io release doesn't reformat anything, running it with the state at main makes every array single-line and running it with the state at this branch makes every array multi-line (max line length seems broken and it fails to add / removes trailing commas for the last array member).

[DevinR528]

I had a copy/paste error, and with that fixed now, it breaks arrays that are longer than 80 bytes (yes, this is just the array part of the string). I'm pretty sure with the older version the formatting was less aggressive, we just kept more of the user's formatting. With the changes now it only reformats 2 missing commas and a multiline array into a single because it is under the 80 bytes. We could make the default 60 and the changes to Ruma's Cargo.toml would just be the 2 commas.

[jplatte]

I just tested this and it looks pretty good! Is it supposed to always say that it has rewritten the file, even if no changes were done, when running in non-check mode?

Also, formatting currently removes trailing commas on multiline arrays, which I find wrong. Do you agree?

Finally, in workspaces where one crate has the same name as the workspace directory itself, it's a bit confusing to see two Checking main-crate lines. How about either changing the messages to refer to the proper file path of the file that was checked, or printing a different message when the Cargo.toml doesn't contain a [package] section?

In any case, approving since this PR is a clear improvement so I wouldn't mind addressing all of those things separately from it.

[DevinR528]

Is it supposed to always say that it has rewritten the file, even if no changes were done, when running in non-check mode?

I'd say this is a bug, it probably always has... I think.

Also, formatting currently removes trailing commas on multiline arrays, which I find wrong. Do you agree?

Agreed, a few of the multiline formatting choices toml_edit made are strange.

I like the idea about either printing file paths or check for [package] section and print different message.

At some point we can file issues for all these!