Simplify a branch that processes unchanged lines

Don't split unblamed hunk when it overlaps with unchanged lines.

Author: cruessler

gix-blame/tests/blame.rs

@@ -367,38 +367,16 @@ fn process_change(
                 (true, false) => {
                     // <-------->     (hunk)
                     //     <------->  (unchanged)
-                    //     <---->     (new hunk)
-                    // <-->           (new hunk)
-
-                    if unchanged.start > hunk.range_in_destination.start {
-                        let line_range_in_next_destination = LineRange::with_offset(
-                            hunk.range_in_destination.start..unchanged.start,
-                            *offset_in_destination,
-                        );
-
-                        new_hunks_to_blame.push(UnblamedHunk::from_destination(
-                            line_range_in_next_destination.into(),
-                            hunk.offset() + *offset_in_destination,
-                        ));
-                    }
 
                     let line_range_in_next_destination =
-                        LineRange::with_offset(unchanged.start..hunk.range_in_destination.end, *offset_in_destination);
+                        LineRange::with_offset(hunk.range_in_destination.clone(), *offset_in_destination);
 
                     new_hunks_to_blame.push(UnblamedHunk::from_destination(
                         line_range_in_next_destination.into(),
                         hunk.offset() + *offset_in_destination,
                     ));
 
-                    let new_change = if unchanged.end > hunk.range_in_destination.end {
-                        let line_range = hunk.range_in_destination.end..unchanged.end;
-
-                        Some(Change::Unchanged(line_range))
-                    } else {
-                        todo!();
-                    };
-
-                    (None, new_change)
+                    (None, Some(Change::Unchanged(unchanged)))
                 }
                 (false, false) => {
                     if unchanged.end <= hunk.range_in_destination.start {
@@ -1761,7 +1739,7 @@ fn process_change_works_enclosing_unchanged_lines() {
     );
 
     assert_eq!(hunk, None);
-    assert_eq!(change, Some(Change::Unchanged(113..172)));
+    assert_eq!(change, Some(Change::Unchanged(109..172)));
     assert_eq!(lines_blamed, vec![]);
     assert_eq!(
         new_hunks_to_blame,
@@ -1819,7 +1797,7 @@ fn process_change_works_unchanged_hunk_2() {
     );
 
     assert_eq!(hunk, None);
-    assert_eq!(change, Some(Change::Unchanged(5..7)));
+    assert_eq!(change, Some(Change::Unchanged(0..7)));
     assert_eq!(lines_blamed, vec![]);
     assert_eq!(
         new_hunks_to_blame,