fix: remove multiple trailing lines in comments #6163
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Previously, rustfmt would remove one blank, trailing line in a comment every time it ran, so formatting was not idempotent if a comment had multiple trailing lines. Comments are only reformatted in this way if `comment::rewrite_comment_inner` is called, which is enabled by any of the config options `normalize_comments`, `wrap_comments`, or `format_code_in_doc_comments` (for doc comments only). Absent those config options, no trailing line reformatting occurs at all. In this commit, when the existing condition that detects a blank, trailing line is true, any preceding blank lines are removed from the reformatted comment. A source/target "system test" was added to prevent regression. Signed-off-by: Ross Williams <ross@ross-williams.net>
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@overhacked thanks for the PR. Would you mind also filing an issue for this too. |
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Previously, rustfmt would remove one blank, trailing line in a comment every time it ran, so formatting was not idempotent if a comment had multiple trailing lines. Comments are only reformatted in this way if
comment::rewrite_comment_inneris called, which is enabled by any of the config optionsnormalize_comments,wrap_comments, orformat_code_in_doc_comments(for doc comments only). Absent those config options, no trailing line reformatting occurs at all.In this fix, when the existing condition that detects a blank, trailing line is true, any preceding blank lines are removed from the reformatted comment. A source/target "system test" was added to prevent regression.