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<!-- 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. |
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| .. | ||
| flake8_to_ruff | ||
| ruff | ||
| ruff_benchmark | ||
| ruff_cache | ||
| ruff_cli | ||
| ruff_dev | ||
| ruff_diagnostics | ||
| ruff_formatter | ||
| ruff_index | ||
| ruff_macros | ||
| ruff_newlines | ||
| ruff_python_ast | ||
| ruff_python_formatter | ||
| ruff_python_semantic | ||
| ruff_python_stdlib | ||
| ruff_rustpython | ||
| ruff_testing_macros | ||
| ruff_textwrap | ||
| ruff_wasm | ||