public @NotNull List<@NotNull AnAction> postProcessVisibleChildren(
    @NotNull AnActionEvent e,
    @NotNull List<? extends @NotNull AnAction> visibleChildren) {
    return Collections.unmodifiableList(visibleChildren);
  }
public @NotNull List<@NotNull AnAction> postProcessVisibleChildren(
    @NotNull AnActionEvent e,
    @NotNull List<? extends @NotNull AnAction> visibleChildren)