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This allows you to:

Do a fade and size transition between two widgets.
Show and hide a widget, by resizing it vertically while fading.
The AnimatedSizeAndFade widget does a fade and size transition between a "new" widget and an "old" widget previously set as a child. The "old" and the "new" children must have the same width, but can have different heights, and you don't need to know their sizes in advance.

You can also define a duration and curve for both the fade and the size, separately.

Important: If the "new" child is the same widget type as the "old" child, but with different parameters, then AnimatedSizeAndFade will NOT do a transition between them, since as far as the framework is concerned, they are the same widget, and the existing widget can be updated with the new parameters. To force the transition to occur, set a Key (typically a ValueKey taking any widget data that would change the visual appearance of the widget) on each child widget that you wish to be considered unique.

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