deleteInternal method
Implementation
Future<void> deleteInternal(Map<ForeignEventId, Event> data, DeviceCalendarEventStore store) async {
var events = await store.getStoredEvents();
var futures = List<Future<bool>>.empty(growable: true);
var toDelete = data.map((key, value) => MapEntry(events[key], value));
for (var e in toDelete.entries) {
futures.add(pluginDeleteEvent(e.value.calendarId, e.key));
}
var results = await Future.wait(futures);
events.removeWhere((key, value) => data.containsKey(key));
store.storeEvents(events);
}