Add order to tasks and lists

server/ajax/storage.go

@@ -77,7 +77,10 @@ func (a *Ajax) storageListTasks(listID string, filters ...func(t *task.Task) boo
 		}
 	}
 	sort.SliceStable(tasks, func(i, j int) bool {
-		return tasks[i].Created.Before(tasks[j].Created)
+		if tasks[i].Index == tasks[j].Index {
+			return tasks[i].Created.Before(tasks[j].Created)
+		}
+		return tasks[i].Index < tasks[j].Index
 	})
 	return tasks, nil
 }