perf: #3571994 Reduce container rebuilds in functional tests

 */

class InstallerKernel extends DrupalKernel {

  /**

   * The extensions from the last container compilation.

   */

  protected array $compiledExtensions = [];

  /**

   * {@inheritdoc}

   */

  protected function initializeContainer() {

    // Always force a container rebuild.

    $this->containerNeedsRebuild = TRUE;

    // Ensure the InstallerKernel's container is not dumped.

    $this->allowDumping = FALSE;

    $container = parent::initializeContainer();

    return $container;

    // During installation, initializeContainer() can be called multiple times

    // without any module changes in between. Since allowDumping is FALSE, no

    // cached container exists, so the parent will always recompile.

    $extensions = $this->getExtensions();

    if (isset($this->container)

      && count($extensions['module'] ?? []) === count($this->compiledExtensions['module'] ?? [])

      && count($extensions['theme'] ?? []) === count($this->compiledExtensions['theme'] ?? [])

      && !array_diff_key($extensions['module'] ?? [], $this->compiledExtensions['module'] ?? [])

      && !array_diff_key($extensions['theme'] ?? [], $this->compiledExtensions['theme'] ?? [])

    ) {

      $this->containerNeedsRebuild = FALSE;

      return $this->container;

    }

    else {

      $this->containerNeedsRebuild = TRUE;

      $this->compiledExtensions = $extensions;

      return parent::initializeContainer();

    }

  }

  /**