How to customize this automatic slug shortener with an overrwrite function

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This is just a first idea: Check if it is the AJAX request.

if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) 
    return $slug;

or:

if (
       isset( $_POST['action'] ) 
       && 'sample-permalink' === $_POST['action']
   ) return $slug;

depending on the level of detail you need.

If you put this in the beginning of the function (maybe below the first test if ($slug) return $slug; then the function should just quit.

If you still want to filter that input as well, for the AJAX request, you need to retrieve it from $_POST['new_title'] instead of $_POST['post_title']. That’s the reason why it deletes your input via AJAX editing.

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