Micha Reiser 6ab3fc60f4 Correctly handle newlines after/before comments (#4895) ... <!-- Thank you for contributing to Ruff! To help us out with reviewing, please consider the following: - Does this pull request include a summary of the change? (See below.) - Does this pull request include a descriptive title? - Does this pull request include references to any relevant issues? --> ## Summary This issue fixes the removal of empty lines between a leading comment and the previous statement: ```python a = 20 # leading comment b = 10 ``` Ruff removed the empty line between `a` and `b` because: * The leading comments formatting does not preserve leading newlines (to avoid adding new lines at the top of a body) * The `JoinNodesBuilder` counted the lines before `b`, which is 1 -> Doesn't insert a new line This is fixed by changing the `JoinNodesBuilder` to count the lines instead *after* the last node. This correctly gives 1, and the `# leading comment` will insert the empty lines between any other leading comment or the node. ## Test Plan I added a new test for empty lines.		2023-06-07 14:49:43 +02:00
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test/fixtures	Correctly handle newlines after/before comments (#4895)	2023-06-07 14:49:43 +02:00