3564e882d7
## Summary
The basic problem here is that when we had multiple items in an inline
array, and that array expanded to multiple lines, we accidentally
changed the indentation part-way through due to how prefixes work in the
TOML.
Here's Claude's explanation of the root cause, which I find pretty
decent:
```
Here's what happened step by step:
1. First item ("iniconfig"): Has empty prefix "" → indentation_prefix stays None → uses default 4 spaces
2. Second item ("ruff"): Has empty prefix "" → indentation_prefix stays None → uses default 4 spaces
3. Third item ("typing-extensions"): Has prefix " " (single space from inline format) → indentation_prefix becomes
Some(" ") → uses only 1 space!
This produced:
[dependency-groups]
dev = [
"iniconfig>=2.0.0",
"ruff",
"typing-extensions", # ← Only 1 space instead of 4!
]
Why the Third Item Had a Different Prefix
In inline arrays like ["ruff", "typing-extensions"], the items are separated by commas and spaces. When parsed by
the TOML library:
- "ruff" has no prefix (it comes right after [)
- "typing-extensions" has a single space prefix (the space after the comma)
The Fix
Moving the indentation calculation outside the loop ensures it's calculated only once:
// Calculate indentation ONCE before the loop
if let Some(first_item) = deps.iter().next() {
let decor_prefix = /* get prefix from first item */
indentation_prefix = (!decor_prefix.is_empty()).then_some(decor_prefix.to_string());
}
// Now use the same indentation for ALL items
for item in deps.iter_mut() {
// Apply consistent indentation to every item
}
This ensures all items get the same indentation (4 spaces by default when converting from inline arrays), producing
the correct output:
[dependency-groups]
dev = [
"iniconfig>=2.0.0",
"ruff",
"typing-extensions", # ← Correct 4-space indentation
]
The bug only affected arrays being converted from inline to multiline format, where different items might have
different residual formatting from their inline representation.
```
Closes #14961.
---------
Co-authored-by: Zanie Blue <contact@zanie.dev>
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