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function _wp_migrate_active_templates() {
	// Do not run during installation when the database is not yet available.
	if ( wp_installing() ) {
		return;
	}

	$active_templates = get_option( 'active_templates', false );

	if ( false !== $active_templates ) {
		return;
	}

	// Query all templates in the database. See `get_block_templates`.
	$wp_query_args = array(
		'post_status'         => 'publish',
		'post_type'           => 'wp_template',
		'posts_per_page'      => -1,
		'no_found_rows'       => true,
		'lazy_load_term_meta' => false,
		'tax_query'           => array(
			array(
				'taxonomy' => 'wp_theme',
				'field'    => 'name',
				'terms'    => get_stylesheet(),
			),
		),
		// Only get templates that are not inactive by default. We check these
		// meta to make sure we don't fill the option with inactive templates
		// created after the 6.9 release when for some reason the option is
		// deleted.
		'meta_query'          => array(
			'relation' => 'OR',
			array(
				'key'     => 'is_inactive_by_default',
				'compare' => 'NOT EXISTS',
			),
			array(
				'key'     => 'is_inactive_by_default',
				'value'   => false,
				'compare' => '=',
			),
		),
	);

	$template_query   = new WP_Query( $wp_query_args );
	$active_templates = array();

	foreach ( $template_query->posts as $post ) {
		$active_templates[ $post->post_name ] = $post->ID;
	}

	update_option( 'active_templates', $active_templates );
}