Record unchanged hunk at end of file

Author: cruessler

gix-blame/tests/blame.rs

@@ -122,13 +122,15 @@ enum Change {
 struct ChangeRecorder {
     previous_after_end: u32,
     changes: Vec<Change>,
+    total_number_of_lines: u32,
 }
 
 impl ChangeRecorder {
-    fn new() -> Self {
+    fn new(total_number_of_lines: u32) -> Self {
         ChangeRecorder {
             previous_after_end: 0,
             changes: vec![],
+            total_number_of_lines,
         }
     }
 }
@@ -155,7 +157,12 @@ impl Sink for ChangeRecorder {
         self.previous_after_end = after.end;
     }
 
-    fn finish(self) -> Self::Out {
+    fn finish(mut self) -> Self::Out {
+        if self.total_number_of_lines > self.previous_after_end {
+            self.changes
+                .push(Change::Unchanged(self.previous_after_end..self.total_number_of_lines));
+        }
+
         self.changes
     }
 }
@@ -587,7 +594,7 @@ fn blame_file(worktree_path: PathBuf, file_path: &BStr) -> Vec<BlameEntry> {
         let outcome = resource_cache.prepare_diff().unwrap();
         let input = outcome.interned_input();
 
-        let change_recorder = ChangeRecorder::new();
+        let change_recorder = ChangeRecorder::new(number_of_lines.try_into().unwrap());
 
         let changes = gix_diff::blob::diff(gix_diff::blob::Algorithm::Histogram, &input, change_recorder);