Eventsubscriber to sort text format filters alphapetically in config (still sorted by weight in the filter format itself)

filter_format_config_sort.services.yml

services:
  filter_format_config_sort.filter_subscriber:
    class: Drupal\filter_format_config_sort\EventSubscriber\FilterConfigSubscriber
    arguments: ['@config.storage', '@config.storage.sync']
    tags:
      - { name: event_subscriber }

FilterConfigSubscriber.php

<?php

namespace Drupal\filter_format_config_sort\EventSubscriber;

use Drupal\Core\Config\ConfigEvents;
use Drupal\Core\Config\StorageInterface;
use Drupal\Core\Config\StorageTransformEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Text format filter config event subscriber.
 */
class FilterConfigSubscriber implements EventSubscriberInterface {

  /**
   * The active config storage.
   *
   * @var \Drupal\Core\Config\StorageInterface
   */
  protected $activeStorage;

  /**
   * The sync config storage.
   *
   * @var \Drupal\Core\Config\StorageInterface
   */
  protected $syncStorage;

  /**
   * DirectoriesConfigSubscriber constructor.
   *
   * @param \Drupal\Core\Config\StorageInterface $config_storage
   *   The config active storage.
   * @param \Drupal\Core\Config\StorageInterface $sync_storage
   *   The sync config storage.
   */
  public function __construct(StorageInterface $config_storage, StorageInterface $sync_storage) {
    $this->activeStorage = $config_storage;
    $this->syncStorage = $sync_storage;
  }

  /**
   * The storage is transformed for importing.
   *
   * @param \Drupal\Core\Config\StorageTransformEvent $event
   *   The config storage transform event.
   */
  public function onImportTransform(StorageTransformEvent $event) {
    $transformation_storage = $event->getStorage();

    foreach ($transformation_storage->listAll() as $config_name) {
      if (strpos($config_name, 'filter.format.') === 0) {
        $config = $transformation_storage->read($config_name);
        $new_config = $config;
        ksort($new_config['filters']);

        // Note: write direct to active storage instead of transform_storage.
        // Not sure if best idea, but seems only way to get the order to stick.
        $this->activeStorage->write($config_name, $new_config);
      }
    }

  }

  /**
   * The storage is transformed for exporting.
   *
   * @param \Drupal\Core\Config\StorageTransformEvent $event
   *   The config storage transform event.
   */
  public function onExportTransform(StorageTransformEvent $event) {

    $transformation_storage = $event->getStorage();
    foreach ($transformation_storage->listAll() as $config_name) {
      if (strpos($config_name, 'filter.format.') === 0) {
        $config = $transformation_storage->read($config_name);
        $new_config = $config;
        ksort($new_config['filters']);
        $transformation_storage->write($config_name, $new_config);
      }
    }

  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    $events[ConfigEvents::STORAGE_TRANSFORM_IMPORT][] = ['onImportTransform'];
    $events[ConfigEvents::STORAGE_TRANSFORM_EXPORT][] = ['onExportTransform'];
    return $events;
  }

}