Lost the ability to see/compare side-by-side what's been deleted/added
### Description
When I update my sketch file and go to Kactus to reflect the change, I no longer see the side-by-side view of what was deleted/added.

### Version
- Kactus version: 0.1.9
- OS version: macOS Sierra version: 10.12.3

![intended_view](https://user-images.githubusercontent.com/12299917/28382768-441fb87e-6c8d-11e7-92c4-b7f4af1739e6.png)

![current_view](https://user-images.githubusercontent.com/12299917/28382773-473401a0-6c8d-11e7-8526-0c08366fc7e9.png)

