Index parameter is not setting initial state of indicator

[yoohoomedia]

The Indicator always starts with the page 0 as the activate index regardless whether one specified an alternate index via constructor parameter.

To fix this one must use the index in the createAnimation call in initState():

Change from:
createAnimation(0.0, 0.0);

to:
createAnimation(widget.index!.toDouble(), widget.index!.toDouble());