Additional hook for list table navigation area

[hlashbrooke]

The extra_tablenav() function in class-wp-posts-list-table.php provides a hook for adding extra filtering options (restrict_manage_posts), but there's no way to add extra markup (links, buttons, additional help text, etc.) after the 'Filter' button. I propose adding an additional hook to allow additional markup to be added here.

Adding a hook here may only have fringe use cases, but I don't see a reason not to include it as it won't affect any existing functionality and will make the post and page list tables just a little bit more extensible.

[hlashbrooke]

Adding hook with $which as the only argument

[hlashbrooke]

Patch includes hook named manage_posts_extra_tablenav with the $which variable as the only parameter. Happy to change the name of the hook if something else would be more in line with WP naming conventions.

[cfoellmann]

It would be great to generalize this action.
Maybe we could add a filter/action to the class WP_List_Table to allow manipulating/extending the extra_tablenav in all tables.

something like:"manage_{$this->screen->id}_extra_tablenav"

[hlashbrooke]

Always nice when an old patch suddenly gets opened up again :) Let me know if you need anything from my side, but @wonderboymusic's refresh looks like it covers everything.

[DrewAPicture]

In 35263:

Administration: Introduce the manage_posts_extra_tablenav action, which fires inside the tablenav for the posts list table, and just outside the "actions" container.

Props hlashbrooke, wonderboymusic.
Fixes #30341.