Use LineRange::with_offset

Author: cruessler

gix-blame/tests/blame.rs

@@ -456,25 +456,26 @@ fn process_change(
                     (new_hunk, None)
                 }
                 (true, false) => {
-                    *offset_in_destination += added.end - added.start;
-                    *offset_in_destination -= number_of_lines_deleted;
-
                     // <-------->     (hunk)
                     //     <------->  (added)
                     //     <---->     (blamed)
                     // <-->           (new hunk)
-                    if added.start > hunk.range_in_destination.start {
-                        let Offset::Added(added_in_destination) = offset_in_destination else {
-                            todo!()
-                        };
 
-                        new_hunks_to_blame.push(UnblamedHunk::new(
-                            (hunk.range_in_destination.start + *added_in_destination)
-                                ..(added.start + *added_in_destination),
+                    if added.start > hunk.range_in_destination.start {
+                        let line_range_in_next_destination = LineRange::with_offset(
+                            hunk.range_in_destination.start..added.start,
                             *offset_in_destination,
+                        );
+
+                        new_hunks_to_blame.push(UnblamedHunk::from_destination(
+                            line_range_in_next_destination.into(),
+                            hunk.offset() + *offset_in_destination,
                         ));
                     }
 
+                    *offset_in_destination += added.end - added.start;
+                    *offset_in_destination -= number_of_lines_deleted;
+
                     lines_blamed.push(BlameEntry::with_offset(
                         added.start..hunk.range_in_destination.end,
                         suspect,