I wanted to use introduction_screen with an Expanded bodyWidget to make sure I am using all the available space for the bodyWidget, but the widget tree was Column -> Padding -> BodyWidget. In this case I cannot use Expanded because it would have an unbounded height. So I changed it to Column -> Container -> BodyWidget where the container has a nullable padding, meaning that if the user leaves it null (as it is by default) the container will not build an inner Padding widget and would allow me to use Expanded as a body widget.

I also renamed descriptionPadding to bodyPadding since it was only used for setting the body padding and nothing else.