Add filter to query loop post template

[huubl]

What?

Adding a filter to query loop post template block content.

Why?

Having a way to make exceptional changes. This gives developers more options to do things that are not (yet) possible with the Block Editor.

How?

By adding this or a similar filter (and maybe even others, e.g. to add classes/attributes dynamically or to change the ul > li to something)

Testing Instructions

Add to functions.php and change the queryId (or remove the IF statement)

add_filter('post_template_block_content', function($content, $query, $queryId) {
    if($queryId === 123){
        return '<p>Post #'. $query->current_post . '</p>'. $content;
    }

    return $content;
}, 10, 3);

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions]

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