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fix: Filter suggestion parts that match existing code While testing my changes to make `rustc` use `annotate-snippets`, I encountered a new `clippy` test failure stemming from [two](https://github.com/rust-lang/rust/pull/145273/files#diff-6e8403e31463539666afbc00479cb416dc767a518f562b6e2960630953ee7da2R275-R278) [suggestion](https://github.com/rust-lang/rust/pull/145273/files#diff-6e8403e31463539666afbc00479cb416dc767a518f562b6e2960630953ee7da2R289-R292) output changes in rust-lang/rust#145273. The new output in these two cases feels like a regression as it is not as clear as the old output, and adds unnecessary information. Before rust-lang/rust#145273 (`Diff` style)  After rust-lang/rust#145273 ("multi-line" style)  The reason for the change was that a new suggestion part (which matches existing code) was added on a different line than the existing parts, causing the suggestion style to change from `Diff` to "multi-line". Since this new part matches existing code, no code changes show up in the output for it, but it still makes the suggestion style "multi-line" when it doesn't need to be. To get the old output back, I made it so that suggestion parts that perfectly match existing code get filtered out. try-job: aarch64-apple
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