I examined the Stepper Class and saw that it is using a ListView to display items in horizontal mode (StepperType.horizontal).
I've no clue, how I can use a nested ListView inside my Step.
I've tried a couple of methods mentioned in other threads, but none worked (due to the impossibility of computation of height).
Meanwhile I'm using a Column instead a ScrollView, but it has a BUG.
When I remove an item from the Column and call setState to refresh the Step, the thing that is rendered is not consistent, the count of Items from DataSource is equal to the count of Widgets in the Column, but the displayed widget is cached somehow showing the removed item.