fix: key review checkmarks by file snapshots instead of revision pairs

src/diff.rs

@@ -127,6 +127,8 @@ pub struct Hunk {
 }
 #[derive(Debug)]
 pub struct ChangedFile {
+    /// Immutable file-side identities, independent of unrelated revision changes.
+    pub review_revisions: Option<[String; 2]>,
     pub path: PathBuf,
     pub old_path: Option<PathBuf>,
     pub status: FileStatus,
@@ -676,6 +678,7 @@ impl DiffState {
         });
         comparison.root = root.clone();
         comparison.files.resize_with(paths.len(), || ChangedFile {
+            review_revisions: None,
             path: PathBuf::new(),
             old_path: None,
             status: FileStatus::Modified,
@@ -1801,11 +1804,20 @@ impl DiffState {
             }
             let records = &mut self.local_review.document.reviewed_files;
             records.retain(|record| {
-                record.revisions != comparison.revisions || record.path != file.path
+                record.revisions
+                    != *file
+                        .review_revisions
+                        .as_ref()
+                        .unwrap_or(&comparison.revisions)
+                    || record.path != file.path
             });
             if reviewed {
                 records.push(crate::review::ReviewedFile {
-                    revisions: comparison.revisions.clone(),
+                    revisions: file
+                        .review_revisions
+                        .as_ref()
+                        .unwrap_or(&comparison.revisions)
+                        .clone(),
                     path: file.path.clone(),
                     old_path: file.old_path.clone(),
                     after: self
@@ -1832,12 +1844,16 @@ impl DiffState {
             .document
             .reviewed_files
             .iter()
-            .filter(|record| record.revisions == comparison.revisions)
-            .map(|record| (&record.path, record))
+            .map(|record| ((&record.revisions, &record.path), record))
             .collect();
         for (index, file) in comparison.files.iter().enumerate() {
             let Some(record) = records
-                .get(&file.path)
+                .get(&(
+                    file.review_revisions
+                        .as_ref()
+                        .unwrap_or(&comparison.revisions),
+                    &file.path,
+                ))
                 .filter(|record| record.old_path == file.old_path)
             else {
                 continue;
@@ -2263,7 +2279,11 @@ impl DiffState {
                     .reviewed_files
                     .iter()
                     .position(|record| {
-                        record.revisions == comparison.revisions
+                        record.revisions
+                            == *file
+                                .review_revisions
+                                .as_ref()
+                                .unwrap_or(&comparison.revisions)
                             && record.path == file.path
                             && record.old_path == file.old_path
                     })

src/repository.rs

@@ -2770,6 +2770,7 @@ impl Repository {
                 continue;
             }
             files.push(ChangedFile {
+                review_revisions: None,
                 path: path.clone(),
                 old_path: None,
                 status: if a.is_none() {
@@ -2827,6 +2828,10 @@ impl Repository {
             .files
             .iter()
             .map(|(path, old_path, status)| ChangedFile {
+                review_revisions: Some([
+                    review_file_revision(prepared.left.get(old_path.as_ref().unwrap_or(path))),
+                    review_file_revision(prepared.right.get(path)),
+                ]),
                 path: path.clone(),
                 old_path: old_path.clone(),
                 status: *status,
@@ -2902,6 +2907,7 @@ impl Repository {
         )?;
         file.status = *status;
         file.old_path = old_path.clone();
+        file.review_revisions = Some([review_file_revision(before), review_file_revision(after)]);
         Ok(file)
     }
     fn changed_file(
@@ -2972,6 +2978,7 @@ impl Repository {
         };
         notices.dedup();
         Ok(ChangedFile {
+            review_revisions: None,
             path: path.to_path_buf(),
             old_path: None,
             status,
@@ -2990,6 +2997,14 @@ impl Repository {
     }
 }
 
+fn review_file_revision(file: Option<&FileData>) -> String {
+    // Git object IDs cover exact bytes (including binary data and EOF), without loading blobs.
+    format!(
+        "file:{}",
+        serde_json::to_string(&file.map(file_identity)).unwrap()
+    )
+}
+
 fn file_identity(file: &FileData) -> (&str, Option<&str>, &[u8], Option<&str>) {
     (
         &file.mode,