Fix chain formatting with pre-existing overflow - #7006
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Summary
Closes #6977.
A nested expression rewrite could succeed while the final chain width check rejected the entire result because an unchanged string literal already exceeded
max_width.For Style Edition 2027, allow the chain rewrite to retain the widest pre-existing normal-code line without permitting a wider overflow. Style Edition 2024 behavior remains unchanged.
Tests
Added source/target regression fixtures for Style Editions 2024 and 2027.