- If the tint color changes, be sure to call -setNeedsDisplay on the view.
- Explictly declare tintColor ivar and getter method.
- If the tintColor is the same as the existing one, early-exit.
- Use the ivar and not the property when setting the tintColor, just as is done for background color.
- Add tests that the tintColor will call -setNeedsDisplay
- Backfill tests to document/verify the tintColor behavior on a node.