Issue #3266341 by nlisgo, cilefen, carstenG, david.qdoscc, Lendude, quietone, smustgrave: Views pagers do math on disparate data types, resulting in type errors in PHP 8

(cherry picked from commit cbd7cf7be9c2687bbc41948d7eae60ac5262ff90)

core/modules/views/src/Plugin/views/pager/SqlBase.php

@@ -260,7 +260,7 @@ abstract class SqlBase extends PagerPluginBase implements CacheableDependencyInt
     if ($this->itemsPerPageExposed()) {
       $query = $this->view->getRequest()->query;
       $items_per_page = $query->get('items_per_page');
-      if ($items_per_page > 0) {
+      if ((int) $items_per_page > 0) {
         $this->options['items_per_page'] = $items_per_page;
       }
       elseif ($items_per_page == 'All' && $this->options['expose']['items_per_page_options_all']) {

core/modules/views/tests/src/Unit/Plugin/pager/SqlBaseTest.php

@@ -0,0 +1,91 @@
+<?php
+
+namespace Drupal\Tests\views\Unit\Plugin\pager;
+
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Tests\UnitTestCase;
+use Drupal\views\Plugin\views\query\QueryPluginBase;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * @coversDefaultClass \Drupal\views\Plugin\views\pager\SqlBase
+ * @group views
+ */
+class SqlBaseTest extends UnitTestCase {
+
+  /**
+   * The mock pager plugin instance.
+   *
+   * @var \Drupal\views\Plugin\views\pager\SqlBase|\PHPUnit\Framework\MockObject\MockObject
+   */
+  protected $pager;
+
+  /**
+   * The mock view instance.
+   *
+   * @var \Drupal\views\ViewExecutable|\PHPUnit\Framework\MockObject\MockObject
+   */
+  protected $view;
+
+  /**
+   * The mock display plugin instance.
+   *
+   * @var \Drupal\views\Plugin\views\display\DisplayPluginBase|\PHPUnit\Framework\MockObject\MockObject
+   */
+  protected $display;
+
+  protected function setUp(): void {
+    $this->pager = $this->getMockBuilder('Drupal\views\Plugin\views\pager\SqlBase')
+      ->disableOriginalConstructor()
+      ->getMockForAbstractClass();
+
+    /** @var \Drupal\views\ViewExecutable|\PHPUnit\Framework\MockObject\MockObject $view */
+    $this->view = $this->getMockBuilder('Drupal\views\ViewExecutable')
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $query = $this->getMockBuilder(QueryPluginBase::class)
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $this->view->query = $query;
+
+    $this->display = $this->getMockBuilder('Drupal\views\Plugin\views\display\DisplayPluginBase')
+      ->disableOriginalConstructor()
+      ->getMock();
+
+    $container = new ContainerBuilder();
+    $container->set('string_translation', $this->getStringTranslationStub());
+    \Drupal::setContainer($container);
+  }
+
+  /**
+   * Tests the query() method.
+   *
+   * @see \Drupal\views\Plugin\views\pager\SqlBase::query()
+   */
+  public function testQuery() {
+    $request = new Request([
+      'items_per_page' => 'All',
+    ]);
+    $this->view->expects($this->any())
+      ->method('getRequest')
+      ->will($this->returnValue($request));
+
+    $options = [];
+    $this->pager->init($this->view, $this->display, $options);
+    $this->pager->query();
+    $this->assertSame(10, $this->pager->options['items_per_page']);
+
+    $options = [
+      'expose' => [
+        'items_per_page' => TRUE,
+        'items_per_page_options_all' => TRUE,
+      ],
+    ];
+    $this->pager->init($this->view, $this->display, $options);
+    $this->pager->query();
+    $this->assertSame(0, $this->pager->options['items_per_page']);
+  }
+
+}