Issue #3502911 by tim.plunkett, nod_, catch: Compressed...

   */

  public function handle(Request $request, $type = self::MAIN_REQUEST, $catch = TRUE): Response {

    if ($type === static::MAIN_REQUEST) {

      $request_ajax_page_state = [];

      if ($request->request->has('ajax_page_state')) {

        $request->request->set('ajax_page_state', $this->parseAjaxPageState($request->request->all('ajax_page_state')));

        $request_ajax_page_state = $this->parseAjaxPageState($request->request->all('ajax_page_state'));

        $request->request->set('ajax_page_state', $request_ajax_page_state);

      }

      elseif ($request->query->has('ajax_page_state')) {

        $request->query->set('ajax_page_state', $this->parseAjaxPageState($request->query->all('ajax_page_state')));

      $query_ajax_page_state = [];

      if ($request->query->has('ajax_page_state')) {

        $query_ajax_page_state = $this->parseAjaxPageState($request->query->all('ajax_page_state'));

        $request->query->set('ajax_page_state', $query_ajax_page_state);

      }

      // If libraries are present in both the request and the query, ensure they

      // match by merging them together.

      if (!empty($request_ajax_page_state['libraries']) && !empty($query_ajax_page_state['libraries'])) {

        $request_libraries = explode(',', $request_ajax_page_state['libraries']);

        $query_libraries = explode(',', $query_ajax_page_state['libraries']);

        $libraries = implode(',', array_unique(array_merge($request_libraries, $query_libraries)));

        $request_ajax_page_state['libraries'] = $libraries;

        $query_ajax_page_state['libraries'] = $libraries;

        $request->request->set('ajax_page_state', $request_ajax_page_state);

        $request->query->set('ajax_page_state', $query_ajax_page_state);

      }

    }

    return $this->httpKernel->handle($request, $type, $catch);

<?php

declare(strict_types=1);

namespace Drupal\Tests\Core\StackMiddleware;

use Drupal\Component\Utility\UrlHelper;

use Drupal\Core\StackMiddleware\AjaxPageState;

use Drupal\Tests\UnitTestCase;

use Symfony\Component\HttpFoundation\Request;

use Symfony\Component\HttpFoundation\Response;

use Symfony\Component\HttpKernel\HttpKernelInterface;

/**

 * @coversDefaultClass \Drupal\Core\StackMiddleware\AjaxPageState

 * @group StackMiddleware

 */

class AjaxPageStateTest extends UnitTestCase {

  /**

   * Tests that the query and request libraries are merged.

   *

   * @dataProvider providerHandle

   */

  public function testHandle(?string $query_libraries, ?string $request_libraries, ?string $query_expected, ?string $request_expected): void {

    $request = new Request();

    if ($query_libraries) {

      $request->query->set('ajax_page_state', ['libraries' => $query_libraries]);

    }

    if ($request_libraries) {

      $request->request->set('ajax_page_state', ['libraries' => $request_libraries]);

    }

    $result_request = new Request();

    if ($query_expected) {

      $result_request->query->set('ajax_page_state', ['libraries' => $query_expected]);

    }

    if ($request_expected) {

      $result_request->request->set('ajax_page_state', ['libraries' => $request_expected]);

    }

    $kernel = $this->prophesize(HttpKernelInterface::class);

    $kernel->handle($result_request, HttpKernelInterface::MAIN_REQUEST, TRUE)

      ->shouldBeCalled()

      ->willReturn($this->createMock(Response::class));

    $middleware = new AjaxPageState($kernel->reveal());

    $middleware->handle($request);

    // Ensure the modified request matches the expected request.

    $this->assertEquals($request->request->all(), $result_request->request->all());

    $this->assertEquals($request->query->all(), $result_request->query->all());

  }

  /**

   * Provides data for testHandle().

   */

  public static function providerHandle(): array {

    $foo_bar = UrlHelper::compressQueryParameter('foo,bar');

    $foo_baz = UrlHelper::compressQueryParameter('foo,baz');

    $data = [];

    $data['only query'] = [

      $foo_bar,

      NULL,

      'foo,bar',

      NULL,

    ];

    $data['only request'] = [

      NULL,

      $foo_bar,

      NULL,

      'foo,bar',

    ];

    $data['matching'] = [

      $foo_bar,

      $foo_bar,

      'foo,bar',

      'foo,bar',

    ];

    $data['different'] = [

      $foo_baz,

      $foo_bar,

      'foo,bar,baz',

      'foo,bar,baz',

    ];

    return $data;

  }

}