protected static @Nullable UsageViewImpl getUsageViewImpl(@NotNull AnActionEvent e) {
    UsageView plainView = e.getData(UsageView.USAGE_VIEW_KEY);
    if (plainView instanceof UsageViewImpl) {
      return (UsageViewImpl)plainView;
    }
    return null;
  }
protected static @Nullable UsageViewImpl getUsageViewImpl(@NotNull AnActionEvent e)