Use case

If a Text can have a selectionColor, then a SelectableText should also be able to set this property, to set the color it should display when being selected.

Proposal

I should be able to set a selection color for SelectableText

const SelectableText('Selectable Text') // No selectionColor

 const SelectionArea(
              child: Text(
                'Text wrapped in SelectionArea',
                selectionColor: Colors.red,
              ),
            )