widgetToImage() renders nothing without supplying size - because of this example app widgetToImage() call does not work

[timmaffett]

The default size parameter (of Size(double.maxFinite, double.maxFinite)) for widgetToImage()prevents it from rendering anything.

The example code calls widgetToImage() without a size parameter, and thus renders nothing. This makes the example app appear to demonstrate that widgetToImage() does not work.
A desired size MUST be supplied to widgetToImage() or it returns an empty image.

[Wing-Li]

You're right. You really helped me a lot. Thank you so much!