Constructor.
| op |
Operation type |
| old_line_start |
Starting line number for old lines (1-based, inclusive) |
| old_line_end |
Ending line number for old lines (1-based, inclusive) |
| new_line_start |
Starting line number for new lines (1-based, inclusive) |
| new_line_end |
Ending line number for new lines (1-based, inclusive) |
| all_old_lines |
Reference to all old lines array |
| all_new_lines |
Reference to all new lines array |