Greg Spencer 6c896ae1f6
Add AnimatedChildSwitcher widget (#16192)
The AnimatedChildSwitcher widget (originally authored by Hixie), will cross-fade between a new child, and a previous child (or children, if the switch happens faster than the fade finishes).

It's a good candidate for places where a widget will be added/removed from a slot, and you want a nice transition to occur.
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