Add hook for get_template_part

[tazotodua]

We frequently use themes, which themselves use
get_template_part('smth1/smth2')

however, i many cases, we want (from custom plugin) to avoid inclusion of specific template parts.

there seems no solution, rather than manually modifying themes inner code to avoid getting that particular template part.

It will be better if there was a hook:

function get_template_part( $slug, $name = null ) {

    .....
    $slug =apply_filters('get_template_part_filter', $slug, $name);
    if(empty($slug)) return;
    ........
      
}

[tazotodua]

Another problem arises when in theme there is:

get_template_part( 'components/footer/site');

as from [https://core.trac.wordpress.org/browser/tags/4.7/src/wp-includes/general-template.php#L158 ):

it becomes:
add_action('get_template_part_components/footer/site'

and I think slash there is not a good idea.

[swissspidy]

Since get_template_part() only calls locate_template() and #13239 suggests adding a filter there, I'm closing this one as a duplicate.