support for custom hirarchical post_types

in the plugins file at line 193 in the function “flatten_page_list” i changed:

- $args = 'sort_column=menu_order&sort_order=asc';
+ $args = 'sort_column=menu_order&sort_order=asc&post_type=' . get_post_type();

i call the plugins theme functions like this:

<?php if ( is_post_type_hierarchical(get_post_type()) ) { ?>
<?php previous_link(); ?><?php parent_link(); ?><?php next_link(); ?>
<?php } ?>

the whole plugin works now also for custom post_types.

maybe this can be implemented in an update?

https://ww.wp.xz.cn/plugins/next-page/