Fill modes

This image tests the implementation of fill modes.

Expected result:

1. The first pair of boxes has no repeat count. The dark blue box should remain at the right after animation whilst the light blue box should stick to the left.
2. The second pair of boxes has a repeat count of 1.5. The dark blue box should remain mid-way through the animation (along the dotted line) and the light blue box should return to the left.
3. The third pair of boxes has a repeat count of 2. The result should be the same as the first pair of boxes.
4. The last pair of boxes have the same properties as the third pair but 2s after the animation is complete the fill modes of these two boxes are switched via script and so their horizontal positions should be swapped.