showPreDialog method
Shows the satisfaction pre-dialog and returns the user's choice.
Return PreDialogResult.positive to proceed to the OS review, PreDialogResult.negative to show the feedback dialog, PreDialogResult.remindLater to skip this time without recording a prompt, or PreDialogResult.dismissed if the user closed without choosing.
Implementation
@override
Future<PreDialogResult> showPreDialog(BuildContext context) async =>
preDialogResult;