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Closes #62796. Follow-up to #62110. # Objective The range of a diagnostic entry is anchored when it is ingested, so it follows edits. The ranges in the related information kept on the diagnostic were the ones the server published. A code action request carried both and reported the same note at two different lines: the entry Zed flattened that note into had followed the edit, the related information had not. The distance does not correct itself either. When diagnostics are merged rather than replaced, the existing entries are re-collected from their anchors while the payload is cloned as it is, so the two positions drift further apart with every edit that passes. `mlir-lsp-server` shows what this costs. `MLIRTextFile::getCodeActions` takes the line number out of `relatedInformation`, and `getCodeActionForDiagnostic` resolves it against its own current document, reading that line to copy its indentation before inserting the `expected-note` check. ## Solution The related information moves from `Diagnostic` onto `DiagnosticEntry<T>`, next to the range it belongs with. The locations of the diagnostic's own file are then in the same coordinate space as that range: anchors inside the buffer, points in the worktree's store. `Diagnostic` carries no coordinates again, so nothing that is only meaningful inside one buffer travels with a payload that outlives it. Every transition goes through `DiagnosticEntry::map_coordinates`: the unsaved-edit adjustment and the clipping when diagnostics are ingested, the anchoring in `DiagnosticSet::new`, and the conversion back to points in `merge_diagnostic_entries`. Only the diagnostic's own range is widened when it is empty, since that is for how it is rendered, while the related locations are reported back as the server framed them. Locations in another file have nothing here to anchor to and are kept as published, which is also what `mlir-lsp-server` expects, since it skips them. `DiagnosticEntryRef` is left alone. It is what the rendering path iterates, down to the scrollbar markers that walk every diagnostic of the buffer on each frame, so nothing there converts or allocates. The entries are read through `diagnostic_entries_in_range` where the request is built, and `diagnostics_in_range` is now implemented on top of it. The field is an `Option`, as an empty `Arc<[_]>` still allocates and most diagnostics carry no related information. `data` has the same staleness and cannot be anchored, as it is opaque. ## Commits The third commit is mechanical: it introduces `DiagnosticEntry::new` and rewrites the literals at its call sites, so that the last commit holds only the change of behaviour. ## Testing Three tests, all failing before this change. The first two are added as separate commits, so that they can be run against `main`: - `test_code_actions_related_information_follows_edits` edits above the note and requests code actions, where the two positions for it used to disagree. - `test_code_actions_related_information_drifts_across_merges` edits and pulls diagnostics twice, where the distance used to be every line inserted since the diagnostic was published rather than the last edit alone. - `test_code_actions_related_information_of_disk_based_diagnostics` publishes a diagnostic computed against the file on disk while the buffer holds an unsaved edit, covering the adjustment the two positions share. - `cargo test -p project` - `cargo test -p language -p diagnostics -p editor` - `cargo fmt --all -- --check` - `./script/clippy -p project -p language` ## Self-Review Checklist: - [x] I've reviewed my own diff for quality, security, and reliability - [x] Unsafe blocks (if any) have justifying comments - [x] The content adheres to Zed's UI standards ([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist) and [icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md) guidelines) - [x] Tests cover the new/changed behavior - [x] Performance impact has been considered and is acceptable --- Release Notes: - Fixed language servers receiving outdated positions for the related information of a diagnostic when code actions are requested. |
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