Updating pie charts doesn't animate

[hash-bang]

Adjusted basic example in this fiddle.

I'm opening a new issue but I suspect this is the same problem as reported in #591.

It seems that dynamically updating the series doesn't fire the animation. This also applies if the entire series is overwritten, appended, sliced or any other array action.

Expected Behaviour

The pie chart should animate when the data series is adjusted.

To reproduce: Click Add Points to Random Series and note that the animation does not fire.

Current Behaviour

The pie chart does not animate.

Your Environment

Using forked version of basic example in above fiddle. Local version is 1.1.0. Also tried with 1.0.0 to same effect.

[pablojim]

Thanks for the example. Could you check if this behaviour works without highcharts-ng?