Duplicate all fields of a blame hunk

src/blame.c

@@ -75,6 +75,11 @@ static git_blame_hunk* dup_hunk(git_blame_hunk *hunk)
 			hunk->orig_path);
 	git_oid_cpy(&newhunk->orig_commit_id, &hunk->orig_commit_id);
 	git_oid_cpy(&newhunk->final_commit_id, &hunk->final_commit_id);
+	newhunk->boundary = hunk->boundary;
+	if (hunk->final_signature)
+		newhunk->final_signature = git_signature_dup(hunk->final_signature);
+	if (hunk->orig_signature)
+		newhunk->orig_signature = git_signature_dup(hunk->orig_signature);
 	return newhunk;
 }