Gate is_multiline
change behind preview
#14630
Merged
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Summary
Ref: #14624 (review)
Test Plan
The test case in the follow-up PR showcases the difference between preview and non-preview formatting: https://github.com/astral-sh/ruff/pull/14624/files#diff-dc25bd4df280d9a9180598075b5bc2d0bac30af956767b373561029309c8f024