Is it ok to use a ScrollController for a ListView within a StatelessWidget. If so, how can the controller be disposed?
If you are using a ScrollController, I think that you probably has a State (to change or maintain) in your widget.
In that case you need to go for a StatefulWidget.
I would just change to a StatefulWidget and use the dispose() method to clean memory.
But first of all, think if you controller has a purpose to exist in the first place. Maybe in your case makes sense.
Check this answer too --> Do stateless widgets dispose on their own?