feat: scope local reviews to comparisons

tests/review_cli.rs

@@ -154,6 +154,7 @@ fn cli_resolves_only_the_requested_comment_and_preserves_original_feedback() {
     let storage = root.join("reviews");
     let mut store = Store::open(&storage).unwrap();
     let mut review = Review::new(root.join("repo"));
+    review.comparison = Some(["frozen-base".into(), "working:frozen-tip".into()]);
     review.summary = "Keep summary".into();
     review.verdict = Some(Verdict::ChangesRequested);
     review.comments = [u64::MAX, 2, 3]
@@ -176,6 +177,11 @@ fn cli_resolves_only_the_requested_comment_and_preserves_original_feedback() {
     let mut other = Review::new(root.join("other"));
     other.comments = review.comments.clone();
     store.save(&mut other).unwrap();
+    let mut source = Review::new(review.root.clone());
+    store.save(&mut source).unwrap();
+    let mut reversed = Review::new(review.root.clone());
+    reversed.comparison = Some(["working:frozen-tip".into(), "frozen-base".into()]);
+    store.save(&mut reversed).unwrap();
     let id = review.storage_id.unwrap();
     let id_text = id.to_string();
     let cli = |repo: &str, args: &[&str]| {
@@ -214,6 +220,7 @@ fn cli_resolves_only_the_requested_comment_and_preserves_original_feedback() {
     let json: serde_json::Value = serde_json::from_slice(&output.stdout).unwrap();
     assert_eq!(json["id"], id);
     assert_eq!(json["revision"], review.storage_revision + 1);
+    assert_eq!(json["comparison"], serde_json::json!(review.comparison));
     assert_eq!(
         json["counts"],
         serde_json::json!({"total": 3, "resolved": 2, "unresolved": 1})
@@ -227,6 +234,7 @@ fn cli_resolves_only_the_requested_comment_and_preserves_original_feedback() {
     assert_eq!(loaded.summary, review.summary);
     assert_eq!(loaded.verdict, review.verdict);
     assert_eq!(loaded.reviewed_files, review.reviewed_files);
+    assert_eq!(loaded.comparison, review.comparison);
     assert!(store.save(&mut review).is_err()); // Stale editors cannot undo resolution.
     assert_eq!(store.load(&review.root, id).unwrap().comments, expected);
 
@@ -264,8 +272,20 @@ fn cli_resolves_only_the_requested_comment_and_preserves_original_feedback() {
     let output = cli("repo", &["list", "--json"]);
     assert!(output.status.success(), "{:?}", output);
     let list: serde_json::Value = serde_json::from_slice(&output.stdout).unwrap();
-    assert_eq!(list["reviews"].as_array().unwrap().len(), 1);
-    assert_eq!(list["reviews"][0]["counts"], json["counts"]);
+    assert_eq!(list["reviews"].as_array().unwrap().len(), 3);
+    assert_eq!(
+        list["reviews"][0]["comparison"],
+        serde_json::json!(reversed.comparison)
+    );
+    assert!(list["reviews"][1]["comparison"].is_null());
+    assert_eq!(list["reviews"][2]["comparison"], json["comparison"]);
+    assert_eq!(list["reviews"][2]["counts"], json["counts"]);
+    let output = cli("repo", &["list"]);
+    assert!(output.status.success(), "{:?}", output);
+    let text = String::from_utf8(output.stdout).unwrap();
+    assert!(text.contains("Scope: source"));
+    assert!(text.contains("Scope: comparison frozen-base → working:frozen-tip"));
+    assert!(text.contains("Scope: comparison working:frozen-tip → frozen-base"));
     let output = cli("repo", &["resolve", &id_text, "2"]);
     assert!(output.status.success(), "{:?}", output);
     let text = String::from_utf8(output.stdout).unwrap();

tests/unit/diff.rs

@@ -2370,6 +2370,7 @@ fn live_state(before: Vec<String>, after: Vec<String>, eof: bool) -> DiffState {
             loaded: true,
         }],
     });
+    state.review_comparison = Some(["base".into(), "working:snapshot".into()]);
     state.files = Some(FilePicker::from_paths(
         PathBuf::new(),
         [(0, PathBuf::from("file"))],
@@ -2764,7 +2765,33 @@ fn restored_review_marks_use_file_identities_and_rename_paths_not_catalog_order(
 }
 
 #[test]
-fn unchanged_file_review_survives_other_files_changing() {
+fn review_marks_cannot_cross_comparison_scopes_even_with_matching_file_identities() {
+    let mut review = crate::review::ReviewState::default();
+    let mut state = DiffState::new();
+    let mut first = comparison();
+    first.files[0].review_revisions = Some(["file-before".into(), "file-after".into()]);
+    state.request_kind = Some(RequestKind::Comparison);
+    state.apply_result(1, Ok(Outcome::Comparison(first)));
+    state.toggle_reviewed(&mut review).unwrap();
+    let initial_scope = review.document.comparison.clone();
+    let mut second = comparison();
+    second.files[0].review_revisions = Some(["file-before".into(), "file-after".into()]);
+    second.revisions[1] = "another-head".into();
+    state.request_kind = Some(RequestKind::Comparison);
+    state.apply_result(2, Ok(Outcome::Comparison(second)));
+    state.restore_reviewed_files(&review);
+    assert!(state.reviewed_files.is_empty());
+    assert_eq!(
+        state.toggle_reviewed(&mut review),
+        Err("Select the review for this comparison first")
+    );
+    assert!(state.reviewed_files.is_empty());
+    assert_eq!(review.document.comparison, initial_scope);
+    assert_eq!(review.document.reviewed_files.len(), 1);
+}
+
+#[test]
+fn working_refresh_retains_scope_and_unchanged_file_progress() {
     let mut review = crate::review::ReviewState::default();
     use crate::repository::Repository;
     use std::sync::{Arc, atomic::AtomicBool};
@@ -2825,20 +2852,27 @@ fn unchanged_file_review_survives_other_files_changing() {
         .compare(2, &before, &after, ComparisonMode::Snapshots, &[])
         .unwrap();
     assert_ne!(changes.revisions, original_revisions);
-    state.request_kind = Some(RequestKind::Comparison);
-    state.apply_result(2, Ok(Outcome::Comparison(changes)));
+    state.after = Some(after);
+    state.request_kind = None;
+    state.pending = None;
+    state.loading = false;
+    state.queue_checkout_refresh(true);
+    state.take_request();
+    assert!(state.apply_result(2, Ok(Outcome::CheckoutRefresh(Some(changes)))));
+    assert_eq!(state.review_comparison, Some(original_revisions));
     review.document = store.load(&root, id).unwrap();
     state.restore_reviewed_files(&review);
     assert_eq!(state.reviewed_files, BTreeSet::from([0]));
+    state.load_file(0);
     let detail = repository.load_file(2, 0).unwrap();
-    state.apply_result(
+    assert!(state.apply_result(
         3,
         Ok(Outcome::File {
             comparison_id: 2,
             file_index: 0,
             file: detail,
         }),
-    );
+    ));
     state.restore_reviewed_files(&review);
     assert_eq!(state.reviewed_files, BTreeSet::from([0]));
     std::fs::remove_dir_all(root).unwrap();

tests/unit/editor.rs

@@ -3017,6 +3017,15 @@ fn diff_preserves_parked_buffers_visual_carets_and_insert_history() {
 }
 
 fn working_diff(editor: &mut Editor, root: &Path, paths: &[&str]) -> Box<[(PathBuf, String)]> {
+    working_diff_with_revisions(editor, root, paths, ["base", "working-snapshot"])
+}
+
+fn working_diff_with_revisions(
+    editor: &mut Editor,
+    root: &Path,
+    paths: &[&str],
+    revisions: [&str; 2],
+) -> Box<[(PathBuf, String)]> {
     use crate::diff::{Catalog, Category, ChangedFile, Comparison, FileStatus, RepoKind, Revision};
     editor.execute("diff");
     let (id, _) = editor.take_diff_request().unwrap();
@@ -3070,7 +3079,7 @@ fn working_diff(editor: &mut Editor, root: &Path, paths: &[&str]) -> Box<[(PathB
         Ok(Outcome::Comparison(Comparison {
             blame: Default::default(),
             root: root.canonicalize().unwrap(),
-            revisions: ["base".into(), "working-snapshot".into()],
+            revisions: revisions.map(str::to_owned),
             before: "base".into(),
             after: "Working".into(),
             editable_paths: paths.iter().map(|path| PathBuf::from(*path)).collect(),
@@ -3081,6 +3090,16 @@ fn working_diff(editor: &mut Editor, root: &Path, paths: &[&str]) -> Box<[(PathB
 }
 
 fn historical_diff(editor: &mut Editor, root: &Path, before: Vec<String>, after: Vec<String>) {
+    historical_diff_with_revisions(editor, root, before, after, ["base", "head"]);
+}
+
+fn historical_diff_with_revisions(
+    editor: &mut Editor,
+    root: &Path,
+    before: Vec<String>,
+    after: Vec<String>,
+    revisions: [&str; 2],
+) {
     use crate::diff::{Catalog, Category, ChangedFile, Comparison, FileStatus, RepoKind, Revision};
     editor.execute("diff");
     let (id, _) = editor.take_diff_request().unwrap();
@@ -3108,7 +3127,7 @@ fn historical_diff(editor: &mut Editor, root: &Path, before: Vec<String>, after:
         Ok(Outcome::Comparison(Comparison {
             blame: Default::default(),
             root: root.to_owned(),
-            revisions: ["base".into(), "head".into()],
+            revisions: revisions.map(str::to_owned),
             before: "base".into(),
             after: "head".into(),
             editable_paths: Default::default(),
@@ -3154,6 +3173,305 @@ fn source_review_editor(directory: &Directory, text: &str) -> (Editor, PathBuf,
     (editor, root, path)
 }
 
+#[test]
+fn comparison_reviews_use_ordered_resolved_identities_and_resume_only_the_same_pair() {
+    use crate::review::{Store, Verdict};
+    let directory = Directory::new();
+    let (mut editor, root, _) = source_review_editor(&directory, "source\n");
+    historical_diff(&mut editor, &root, vec!["old".into()], vec!["new".into()]);
+    editor.execute("comment");
+    type_text(&mut editor, "iPair feedback");
+    editor.handle(Input::Escape);
+    editor.execute("w");
+    editor.handle(Input::Escape);
+    editor.execute("diff.review.toggle");
+    editor.execute("review.verdict looks_good");
+    let original = editor.local_review.document.clone();
+    editor.handle(Input::Escape);
+    for pair in [["other", "head"], ["base", "other"], ["head", "base"]] {
+        historical_diff_with_revisions(
+            &mut editor,
+            &root,
+            vec!["old".into()],
+            vec!["new".into()],
+            pair,
+        );
+        assert_eq!(
+            editor.local_review.document.comparison,
+            Some(pair.map(str::to_owned))
+        );
+        assert!(editor.local_review.document.comments.is_empty());
+        assert!(editor.local_review.document.verdict.is_none());
+        assert!(editor.local_review.document.reviewed_files.is_empty());
+        assert!(editor.workspace_diff().unwrap().reviewed_files.is_empty());
+        editor.execute("review.verdict changes_requested");
+        assert_ne!(editor.local_review.document.storage_id, original.storage_id);
+        editor.handle(Input::Escape);
+    }
+    historical_diff(&mut editor, &root, vec!["old".into()], vec!["new".into()]);
+    assert_eq!(editor.local_review.document.storage_id, original.storage_id);
+    assert_eq!(
+        editor.local_review.document.comments[0].body,
+        "Pair feedback"
+    );
+    assert_eq!(
+        editor.local_review.document.verdict,
+        Some(Verdict::LooksGood)
+    );
+    assert_eq!(
+        editor.workspace_diff().unwrap().reviewed_files,
+        BTreeSet::from([0])
+    );
+    assert_eq!(
+        Store::open(&root.join("reviews"))
+            .unwrap()
+            .list(&root)
+            .unwrap()
+            .len(),
+        4
+    );
+}
+
+#[test]
+fn source_and_comparison_reviews_remain_separate_in_shared_panes_and_tabs() {
+    let directory = Directory::new();
+    let (mut editor, root, _) = source_review_editor(&directory, "source\n");
+    let source = editor.pane_id;
+    editor.execute("comment");
+    type_text(&mut editor, "iSource feedback");
+    editor.handle(Input::Escape);
+    editor.execute("w");
+    let source_id = editor.local_review.document.storage_id;
+    editor.handle(Input::Escape);
+    editor.split_pane(SplitAxis::Vertical);
+    let comparison_pane = editor.pane_id;
+    historical_diff(&mut editor, &root, vec!["old".into()], vec!["new".into()]);
+    editor.execute("comment");
+    type_text(&mut editor, "iComparison feedback");
+    editor.handle(Input::Escape);
+    editor.execute("w");
+    let comparison_id = editor.local_review.document.storage_id;
+    assert_ne!(comparison_id, source_id);
+    editor.handle(Input::Escape);
+    editor.select_pane(source);
+    editor.execute("review.edit 1");
+    assert_eq!(editor.local_review.document.storage_id, source_id);
+    assert!(editor.local_review.document.comparison.is_none());
+    assert_eq!(editor.context().text, "Source feedback");
+    editor.handle(Input::Escape);
+    editor.select_pane(comparison_pane);
+    editor.execute("review.edit 1");
+    assert_eq!(editor.local_review.document.storage_id, comparison_id);
+    assert_eq!(editor.context().text, "Comparison feedback");
+    editor.handle(Input::Escape);
+    editor.select_pane(source);
+    editor.execute("tab.new");
+    editor.execute("review.edit 1");
+    assert_eq!(editor.local_review.document.storage_id, source_id);
+    assert_eq!(editor.context().text, "Source feedback");
+    editor.handle(Input::Escape);
+    historical_diff(&mut editor, &root, vec!["old".into()], vec!["new".into()]);
+    assert_eq!(editor.local_review.document.storage_id, comparison_id);
+    editor.execute("tab.previous");
+    editor.select_pane(comparison_pane);
+    editor.execute("review.edit 1");
+    assert_eq!(editor.context().text, "Comparison feedback");
+}
+
+#[test]
+fn review_selectors_and_explicit_opens_reject_other_comparison_and_source_scopes() {
+    use crate::review::{Review, Store};
+    let directory = Directory::new();
+    let (mut editor, root, _) = source_review_editor(&directory, "source\n");
+    let mut store = Store::open(&root.join("reviews")).unwrap();
+    let mut source = Review::new(root.clone());
+    source.summary = "source-only".into();
+    store.save(&mut source).unwrap();
+    let mut other = Review::new(root.clone());
+    other.comparison = Some(["different".into(), "head".into()]);
+    other.summary = "other-pair-only".into();
+    store.save(&mut other).unwrap();
+    let other_json = root.join("other.json");
+    other.save(&other_json).unwrap();
+    let source_json = root.join("source.json");
+    source.save(&source_json).unwrap();
+    historical_diff(&mut editor, &root, vec!["old".into()], vec!["new".into()]);
+    editor.execute("review.verdict looks_good");
+    let current = editor.local_review.document.clone();
+    for command in [
+        format!("review.open {}", source.storage_id.unwrap()),
+        format!("review.open {}", other.storage_id.unwrap()),
+        format!("review.open {}", source_json.display()),
+        format!("review.open {}", other_json.display()),
+    ] {
+        editor.execute(&command);
+        assert!(
+            editor
+                .message()
+                .contains("different comparison or source scope")
+        );
+        assert_eq!(editor.local_review.document.storage_id, current.storage_id);
+        assert_eq!(editor.local_review.document.comparison, current.comparison);
+        assert_eq!(editor.local_review.document.verdict, current.verdict);
+    }
+    editor.execute("review.new");
+    let second_id = editor.local_review.document.storage_id;
+    editor.execute("review.open");
+    assert!(!editor.context().text.contains("source-only"));
+    assert!(!editor.context().text.contains("other-pair-only"));
+    editor.handle(Input::Enter);
+    assert_eq!(editor.local_review.document.storage_id, second_id);
+    editor.execute(&format!("review.open {}", current.storage_id.unwrap()));
+    assert_eq!(editor.local_review.document.storage_id, current.storage_id);
+}
+
+#[test]
+fn dirty_review_drafts_guard_scope_replacement_new_reviews_and_mode_changes() {
+    let directory = Directory::new();
+    let (mut editor, root, _) = source_review_editor(&directory, "source\n");
+    let source = editor.pane_id;
+    editor.split_pane(SplitAxis::Vertical);
+    let comparison_pane = editor.pane_id;
+    historical_diff(&mut editor, &root, vec!["old".into()], vec!["new".into()]);
+    editor.execute("comment");
+    type_text(&mut editor, "iUnsaved feedback");
+    editor.handle(Input::Escape);
+    let draft = editor.buffer_id();
+    let panel = editor.review_pane.unwrap();
+    let scope = editor.local_review.document.comparison.clone();
+    editor.execute("review.new");
+    assert!(editor.message().contains("Save the current local review"));
+    assert_eq!(editor.context().text, "Unsaved feedback");
+    editor.select_pane(source);
+    editor.execute("review.overview");
+    assert!(editor.message().contains("changing review scopes"));
+    assert_eq!(editor.local_review.document.comparison, scope);
+    editor.select_pane(comparison_pane);
+    let comparison = editor.workspace_diff().unwrap().comparison_id;
+    editor.act(Action::DiffModeToggle);
+    assert_eq!(editor.workspace_diff().unwrap().comparison_id, comparison);
+    assert!(editor.workspace_diff().unwrap().comparison.is_some());
+    editor.execute("diff");
+    assert_eq!(editor.workspace_diff().unwrap().comparison_id, comparison);
+    editor.select_pane(panel);
+    assert_eq!(editor.buffer_id(), draft);
+    assert_eq!(editor.context().text, "Unsaved feedback");
+    editor.execute("w");
+    editor.handle(Input::Escape);
+    editor.select_pane(source);
+    editor.execute("review.overview");
+    assert!(editor.local_review.document.comparison.is_none());
+    assert!(editor.local_review.document.comments.is_empty());
+}
+
+#[test]
+fn working_refresh_keeps_review_scope_and_drafts_but_explicit_reopen_uses_new_identities() {
+    let directory = Directory::new();
+    let (mut editor, root, _) = source_review_editor(&directory, "source\n");
+    fs::write(root.join("file.txt"), "original\n").unwrap();
+    working_diff(&mut editor, &root, &["file.txt"]);
+    editor.handle(Input::Enter);
+    editor.execute("comment");
+    type_text(&mut editor, "iWorking feedback");
+    editor.handle(Input::Escape);
+    editor.execute("w");
+    editor.handle(Input::Escape);
+    let original_id = editor.local_review.document.storage_id;
+    let scope = editor.local_review.document.comparison.clone();
+    editor.execute("review.summary");
+    type_text(&mut editor, "iUnsaved working summary");
+    editor.handle(Input::Escape);
+    let panel = editor.review_pane.unwrap();
+    let owner = editor.diff_owner.unwrap();
+    editor.queue_checkout_refreshes(true);
+    let (_, request, _) = editor.take_next_diff_request().unwrap();
+    let mut replacement = editor.with_pane(owner, |editor| {
+        editor.diff.as_mut().unwrap().comparison.take().unwrap()
+    });
+    replacement.revisions[1] = "working:changed".into();
+    replacement.files[0].after = vec!["refreshed".into()];
+    assert!(editor.apply_diff_result(request, Ok(Outcome::CheckoutRefresh(Some(replacement)))));
+    assert_eq!(editor.local_review.document.comparison, scope);
+    assert_eq!(editor.local_review.document.storage_id, original_id);
+    assert_eq!(
+        editor.local_review.document.comments[0].body,
+        "Working feedback"
+    );
+    assert!(editor.current_review_dirty());
+    editor.select_pane(panel);
+    assert_eq!(editor.context().text, "Unsaved working summary");
+    editor.execute("w");
+    editor.handle(Input::Escape);
+    working_diff_with_revisions(
+        &mut editor,
+        &root,
+        &["file.txt"],
+        ["base", "working:changed"],
+    );
+    assert!(editor.local_review.document.comments.is_empty());
+    assert!(editor.local_review.document.summary.is_empty());
+    editor.execute("review.verdict looks_good");
+    assert_ne!(editor.local_review.document.storage_id, original_id);
+    editor.handle(Input::Escape);
+    working_diff(&mut editor, &root, &["file.txt"]);
+    assert_eq!(editor.local_review.document.storage_id, original_id);
+    assert_eq!(
+        editor.local_review.document.summary,
+        "Unsaved working summary"
+    );
+}
+
+#[test]
+fn moved_bookmark_selects_new_review_and_dirty_draft_blocks_endpoint_replacement() {
+    use crate::diff::Comparison;
+    let directory = Directory::new();
+    let (mut editor, root, _) = source_review_editor(&directory, "source\n");
+    historical_diff(&mut editor, &root, vec!["old".into()], vec!["new".into()]);
+    editor.execute("review.verdict looks_good");
+    let original_id = editor.local_review.document.storage_id;
+    editor.handle(Input::Escape);
+    editor.execute("review.summary");
+    type_text(&mut editor, "iBookmark draft");
+    editor.handle(Input::Escape);
+    let panel = editor.review_pane.unwrap();
+    let moved = || Comparison {
+        revisions: ["base".into(), "moved-head".into()],
+        root: root.clone(),
+        before: "base".into(),
+        after: "head".into(),
+        blame: Default::default(),
+        editable_paths: Default::default(),
+        files: Vec::new(),
+    };
+    editor.queue_checkout_refreshes(false);
+    let (_, request, _) = editor.take_next_diff_request().unwrap();
+    assert!(editor.apply_diff_result(request, Ok(Outcome::BookmarkRefresh(moved()))));
+    assert_eq!(editor.local_review.document.storage_id, original_id);
+    assert_eq!(
+        editor
+            .workspace_diff()
+            .unwrap()
+            .comparison
+            .as_ref()
+            .unwrap()
+            .revisions[1],
+        "head"
+    );
+    editor.select_pane(panel);
+    assert_eq!(editor.context().text, "Bookmark draft");
+    editor.execute("w");
+    editor.handle(Input::Escape);
+    editor.queue_checkout_refreshes(false);
+    let (_, request, _) = editor.take_next_diff_request().unwrap();
+    assert!(editor.apply_diff_result(request, Ok(Outcome::BookmarkRefresh(moved()))));
+    assert_eq!(
+        editor.local_review.document.comparison,
+        Some(["base".into(), "moved-head".into()])
+    );
+    assert!(editor.local_review.document.verdict.is_none());
+    assert!(editor.local_review.document.summary.is_empty());
+}
+
 #[test]
 fn source_review_drafts_guard_source_pane_close_and_saved_panels_retarget() {
     let directory = Directory::new();
@@ -3443,6 +3761,8 @@ fn review_navigation_maps_working_ranges_and_preserves_stale_snapshots() {
         .unwrap()
         .revisions[1] = "working:old".into();
     editor.local_review.document = crate::review::Review::new(root);
+    editor.local_review.document.comparison =
+        editor.workspace_diff().unwrap().review_comparison.clone();
     let anchor = Anchor {
         revision: "working:old".into(),
         path: "file.txt".into(),
@@ -7595,6 +7915,7 @@ mod system_clipboard {
             let root = fixture.0.0.canonicalize().unwrap();
             let storage = root.join("reviews");
             let mut review = Review::new(root.clone());
+            review.comparison = Some(["base".into(), "head".into()]);
             review.summary = "Review summary".into();
             review.verdict = Some(Verdict::ChangesRequested);
             review.comments = vec![

tests/unit/review.rs

@@ -151,7 +151,7 @@ fn database_restarts_preserve_identity_and_exact_stale_anchors() {
     let exported = fs::read(&path).unwrap();
     let json: serde_json::Value = serde_json::from_slice(&exported).unwrap();
     assert_eq!(json["comments"][0]["resolved"], true);
-    assert_eq!(json["version"], 4);
+    assert_eq!(json["version"], 5);
     assert_eq!(json["reviewed_files"][0]["after"], "live 👩‍🔬\r\n");
     assert!(json["reviewed_files"][1]["after"].is_null());
     assert_eq!(json["reviewed_files"][2]["after"], "");
@@ -189,6 +189,139 @@ fn database_restarts_preserve_identity_and_exact_stale_anchors() {
     assert_eq!(loaded.verdict, verdict);
 }
 
+#[test]
+fn comparison_scopes_roundtrip_in_order_and_cannot_move_saved_reviews() {
+    let directory = directory();
+    let root = directory.0.canonicalize().unwrap();
+    let storage = root.join("storage");
+    let mut store = Store::open(&storage).unwrap();
+    let mut source = Review::new(root.clone());
+    store.save(&mut source).unwrap();
+    let endpoints = ["frozen-base".to_owned(), "working:frozen-tip".to_owned()];
+    let mut comparison = Review::new(root.clone());
+    comparison.comparison = Some(endpoints.clone());
+    store.save(&mut comparison).unwrap();
+    let id = comparison.storage_id.unwrap();
+    assert!(source.summary_text().contains("Scope: source"));
+    assert!(
+        comparison
+            .summary_text()
+            .contains("Scope: comparison frozen-base → working:frozen-tip")
+    );
+    let mut reversed = Review::new(root.clone());
+    reversed.comparison = Some([endpoints[1].clone(), endpoints[0].clone()]);
+    store.save(&mut reversed).unwrap();
+    drop(store);
+    let mut store = Store::open(&storage).unwrap();
+    let reviews = store.list(&root).unwrap();
+    assert_eq!(reviews.len(), 3);
+    assert_eq!(reviews[0].comparison, reversed.comparison);
+    assert_eq!(reviews[1].comparison, Some(endpoints.clone()));
+    assert_eq!(reviews[2].comparison, None);
+    let mut loaded = store.load(&root, id).unwrap();
+    let path = root.join("comparison.json");
+    loaded.save(&path).unwrap();
+    let json: serde_json::Value = serde_json::from_slice(&fs::read(&path).unwrap()).unwrap();
+    assert_eq!(json["comparison"], serde_json::json!(endpoints));
+    let imported = Review::load(&path, &root).unwrap();
+    assert_eq!(imported.comparison, loaded.comparison);
+    loaded.comparison = None;
+    assert!(store.save(&mut loaded).unwrap_err().contains("scope"));
+    assert_eq!(store.load(&root, id).unwrap().comparison, Some(endpoints));
+    assert_eq!(loaded.storage_revision, 1);
+    source.comparison = reversed.comparison;
+    assert!(store.save(&mut source).is_err());
+    assert_eq!(
+        store
+            .load(&root, source.storage_id.unwrap())
+            .unwrap()
+            .comparison,
+        None
+    );
+}
+
+#[test]
+fn invalid_comparison_scopes_and_old_json_are_rejected_without_replacing_data() {
+    let directory = directory();
+    let root = directory.0.canonicalize().unwrap();
+    let mut review = Review::new(root.clone());
+    let path = root.join("review.json");
+    review.save(&path).unwrap();
+    let original = fs::read(&path).unwrap();
+    let mut store = Store::open(&root.join("storage")).unwrap();
+    for endpoint in ["", "bad\nrevision", "bad\0revision"] {
+        for side in [0, 1] {
+            let mut endpoints = ["base".to_owned(), "tip".to_owned()];
+            endpoints[side] = endpoint.into();
+            review.comparison = Some(endpoints);
+            assert!(review.save(&path).unwrap_err().contains("immutable"));
+            assert!(store.save(&mut review).unwrap_err().contains("immutable"));
+            assert_eq!(fs::read(&path).unwrap(), original);
+            assert_eq!((review.storage_id, review.storage_revision), (None, 0));
+        }
+    }
+    assert!(store.list(&root).unwrap().is_empty());
+    let mut old: serde_json::Value = serde_json::from_slice(&original).unwrap();
+    old["version"] = 4.into();
+    old.as_object_mut().unwrap().remove("comparison");
+    let bytes = serde_json::to_vec(&old).unwrap();
+    fs::write(&path, &bytes).unwrap();
+    assert!(
+        Review::load(&path, &root)
+            .unwrap_err()
+            .contains("Unsupported review version 4")
+    );
+    assert_eq!(fs::read(&path).unwrap(), bytes);
+    let fresh = Review::new(root.clone());
+    assert!(fresh.save(&path).is_err());
+    assert_eq!(fs::read(&path).unwrap(), bytes);
+}
+
+#[test]
+fn comparison_rows_enforce_complete_pairs_and_the_review_size_limit() {
+    let directory = directory();
+    let root = directory.0.canonicalize().unwrap();
+    let mut store = Store::open(&root.join("storage")).unwrap();
+    let mut review = Review::new(root.clone());
+    store.save(&mut review).unwrap();
+    let id = review.storage_id.unwrap();
+    for update in [
+        "before_revision = 'base'",
+        "after_revision = 'tip'",
+        "before_revision = '', after_revision = 'tip'",
+        "before_revision = 'base', after_revision = ''",
+    ] {
+        assert!(
+            store
+                .connection
+                .execute(&format!("UPDATE reviews SET {update} WHERE id = ?1"), [id],)
+                .is_err()
+        );
+    }
+    store
+        .connection
+        .execute(
+            "UPDATE reviews SET before_revision = 'base', after_revision = char(10) WHERE id = ?1",
+            [id],
+        )
+        .unwrap();
+    assert!(store.load(&root, id).unwrap_err().contains("immutable"));
+    store
+        .connection
+        .execute(
+            "UPDATE reviews SET after_revision = hex(zeroblob(?1)) WHERE id = ?2",
+            params![(LIMIT / 2) as i64, id],
+        )
+        .unwrap();
+    assert!(store.load(&root, id).unwrap_err().contains("64 MiB"));
+    assert!(store.list(&root).unwrap_err().contains("64 MiB"));
+    review.comparison = Some(["base".into(), "x".repeat(LIMIT)]);
+    assert!(store.save(&mut review).unwrap_err().contains("64 MiB"));
+    let path = root.join("too-large.json");
+    assert!(review.save(&path).unwrap_err().contains("64 MiB"));
+    assert!(!path.exists());
+}
+
 #[test]
 fn database_repository_identity_is_canonical_and_independent() {
     let first = directory();
@@ -268,9 +401,16 @@ fn database_conflicts_and_locked_writes_keep_drafts_and_identity() {
 #[test]
 fn incompatible_database_schemas_are_preserved() {
     let previous = format!(
-        "{REVIEWS_SCHEMA}; {COMMENTS_SCHEMA};
+        "CREATE TABLE reviews (
+            id INTEGER PRIMARY KEY CHECK (id > 0),
+            root TEXT NOT NULL,
+            revision INTEGER NOT NULL CHECK (revision > 0),
+            summary TEXT NOT NULL,
+            verdict TEXT CHECK (verdict IN ('looks_good', 'changes_requested'))
+        ) STRICT;
+         {COMMENTS_SCHEMA}; {REVIEWED_FILES_SCHEMA};
          INSERT INTO reviews VALUES (1, '/old/repo', 1, 'Preserve me', 'looks_good');
-         PRAGMA user_version = 2"
+         PRAGMA user_version = 3"
     );
     for schema in [
         previous.as_str(),
@@ -799,12 +939,12 @@ fn exact_grapheme_ranges_roundtrip_and_reject_invalid_coordinates() {
         .as_object_mut()
         .unwrap()
         .remove("resolved");
-    for version in [2, 3, 4] {
+    for version in [2, 3, 4, 5] {
         missing_resolution["version"] = version.into();
         let bytes = serde_json::to_vec(&missing_resolution).unwrap();
         fs::write(&path, &bytes).unwrap();
         let error = Review::load(&path, &root).unwrap_err();
-        if version < 4 {
+        if version < 5 {
             assert!(error.contains("Unsupported review version"));
         } else {
             assert!(error.contains("missing field"));

tests/unit/tui.rs

@@ -1272,10 +1272,6 @@ fn resolver_renders_aligned_native_draft_alternative_and_separate_history() {
         assert!(!heading.contains(resolver.files[current_file].path.to_string_lossy().as_ref()));
         assert!(!heading.split_whitespace().any(|word| word == "M"));
     }
-    assert!(
-        line_at(&terminal, alternative, alternative.bottom() - 1)
-            .contains(&resolver.files[current_file].sources[alternative_index].label)
-    );
     assert!(
         line_at(&terminal, draft, draft.bottom() - 1)
             .chars()