setNextCompletion method Null safety
- int sinceCompletion
 
Calculates the time of next completion with the duration sinceCompletion
Implementation
Future<void> setNextCompletion(int sinceCompletion) async {
  if (repeats == null) return;
  if (repeats!.after.inMilliseconds <= sinceCompletion) {
    await updateCompletion(completion.add(repeats!.every));
  }
}