moveToPreviousFocus method
Moves focus to the previous OTP input field.
Implementation
void moveToPreviousFocus(int index) async {
if (index >= 1) {
context.unFocus(list[index].focusNode!);
context.requestFocus(list[index - 1].focusNode!);
setTextSelection(index - 1);
} else {
context.unFocus(list[index].focusNode!);
context.requestFocus(list[0].focusNode!);
setTextSelection(0);
}
}