Consume addition when before hunk

gix-blame/tests/blame.rs

@@ -491,6 +491,12 @@ fn process_change(
                     //
                     // <-->          (hunk)
                     //       <---->  (added)
+
+                    if added.end <= hunk.range_in_destination.start {
+                        *offset_in_destination += added.end - added.start;
+                        *offset_in_destination -= number_of_lines_deleted;
+                    }
+
                     let line_range_in_next_destination =
                         LineRange::with_offset(hunk.range_in_destination.clone(), *offset_in_destination);
 
@@ -499,7 +505,13 @@ fn process_change(
                         hunk.offset() + *offset_in_destination,
                     ));
 
-                    (None, Some(Change::Added(added, number_of_lines_deleted)))
+                    let new_change = if added.end <= hunk.range_in_destination.start {
+                        None
+                    } else {
+                        Some(Change::Added(added.clone(), number_of_lines_deleted))
+                    };
+
+                    (None, new_change)
                 }
             }
         }
@@ -1209,6 +1221,36 @@ fn process_change_works_no_overlap() {
     assert_eq!(offset_in_destination, Offset::Deleted(3));
 }
 
+#[test]
+fn process_change_works_no_overlap_2() {
+    let mut lines_blamed: Vec<BlameEntry> = vec![];
+    let mut new_hunks_to_blame: Vec<UnblamedHunk> = vec![];
+    let mut offset_in_destination: Offset = Offset::Added(0);
+    let suspect = ObjectId::null(gix_hash::Kind::Sha1);
+
+    let (hunk, change) = process_change(
+        &mut lines_blamed,
+        &mut new_hunks_to_blame,
+        &mut offset_in_destination,
+        suspect,
+        // range_in_destination: 6..8
+        Some(UnblamedHunk::new(9..11, Offset::Added(3))),
+        Some(Change::Added(2..5, 0)),
+    );
+
+    assert_eq!(hunk, None);
+    assert_eq!(change, None);
+    assert_eq!(lines_blamed, vec![]);
+    assert_eq!(
+        new_hunks_to_blame,
+        vec![UnblamedHunk {
+            range_in_blamed_file: 9..11,
+            range_in_destination: 3..5
+        }]
+    );
+    assert_eq!(offset_in_destination, Offset::Added(3));
+}
+
 #[test]
 fn process_change_works_unchanged_hunk() {
     let mut lines_blamed: Vec<BlameEntry> = vec![];