Excluding categories from “Manage Categories” using a get_terms filter

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I think you should use get_terms_args filter instead of get_terms and just add exclude arg, so now get_terms() function won’t retrieve those cats and you’ll get right count. Here’s code example:

add_filter( 'get_terms_args', 'mamaduka_edit_get_terms_args', 10, 2 );
/**
 * Exclude categories from "Edit Categories" screen
 *
 */
 function mamaduka_edit_get_terms_args( $args, $taxonomies ) {
    if ( is_admin() && 'category' !== $taxonomies[0] )
        return $args;

    $args['exclude'] = array( 8, 10); // Array of cat ids you want to exclude
    return $args;
}

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