public void notification(@NotNull String groupId,
                           @NotNull NotificationType type,
                           @Nullable @NlsContexts.NotificationTitle String title,
                           @Nullable @NlsContexts.NotificationSubtitle String subtitle,
                           @NotNull @NlsContexts.NotificationContent String content,
                           @Nullable Project project,
                           @NotNull String displayId) {
    notification(groupId, type, title, subtitle, content, project, displayId, null);
  }
public void notification(@NotNull String groupId,
                           @NotNull NotificationType type,
                           @Nullable @NlsContexts.NotificationTitle String title,
                           @Nullable @NlsContexts.NotificationSubtitle String subtitle,
                           @NotNull @NlsContexts.NotificationContent String content,
                           @Nullable Project project,
                           @NotNull String displayId)