handleNextModeStepByStep method
// MODE STEP BY STEP
Implementation
Future<void> handleNextModeStepByStep() async {
assert(quiz.steppingModeType == QuizSteppingModeTypes.step_by_step);
bool isGoingToPrevious = false;
assert(isGoingToPrevious == false);
if (!_isFormValidable()) return;
if (!mounted) return;
String newStatus = getUpdatedStatus(isGoingToPrevious: isGoingToPrevious);
_beforeStepChange();
quiz.handleNextStep();
await _onStepChanged(newStatus: newStatus);
_redrawListOfQuestions();
_resetScrollToTopUnanimated();
}