Rerendering uncontrolled Tabs can incorrectly reset selected index back to initial

[cyu06]

Uncontrolled tabs that have an initialSelectedTabIndex specified will fall back to that initial value upon rerender, even after a click selection has set the internal state to a new selected tab.

Local repro: rerendering the top part of my local example shows this tab index reset, even after a new tab has been selected.

I would expect this reset to only occur if the component was completely unmounted then remounted.