Animation seems to get disabled after controlled size change

[gaearon]

Say you have onSizeChange handler that updates size prop.

1. Drag the resizer
2. The size gets updated

Now change the position prop.

Expected: position change is animated.
Actual: position change is abrupt. If you then set visible to false and true again, the animation starts to work, but only until next resize.

[alexkuz]

should be fixed now

170fb0c