Update to Drupal 8.0.0 beta 14. For more information, see https://drupal.org/node/2544542

core/modules/page_cache/page_cache.module

@@ -29,18 +29,3 @@ function page_cache_help($route_name, RouteMatchInterface $route_match) {
       return $output;
   }
 }
-
-/**
- * Implements hook_form_alter().
- */
-function page_cache_form_alter(&$form, FormStateInterface $form_state, $form_id) {
-  // If the page that's being built is cacheable, set the 'immutable' flag, to
-  // ensure that when the form is used, a new form build ID is generated when
-  // appropriate, to prevent information disclosure.
-  $request_policy = \Drupal::service('page_cache_request_policy');
-  $request = \Drupal::requestStack()->getCurrentRequest();
-  $request_is_cacheable = $request_policy->check($request) === RequestPolicyInterface::ALLOW;
-  if ($request_is_cacheable) {
-    $form_state->addBuildInfo('immutable', TRUE);
-  }
-}

core/modules/page_cache/src/Tests/PageCacheTagsIntegrationTest.php

@@ -71,16 +71,19 @@ class PageCacheTagsIntegrationTest extends WebTestBase {
 
     $cache_contexts = [
       'languages:' . LanguageInterface::TYPE_INTERFACE,
-      'route.menu_active_trails:account',
-      'route.menu_active_trails:footer',
-      'route.menu_active_trails:main',
-      'route.menu_active_trails:tools',
+      'route',
       'theme',
       'timezone',
       'user.permissions',
+      // The user login block access depends on whether the current user is
+      // logged in or not.
+      'user.roles:anonymous',
       // The cache contexts associated with the (in)accessible menu links are
       // bubbled.
       'user.roles:authenticated',
+      // The placed block is only visible on certain URLs through a visibility
+      // condition.
+      'url',
     ];
 
     // Full node page 1.
@@ -93,6 +96,9 @@ class PageCacheTagsIntegrationTest extends WebTestBase {
       'config:block.block.bartik_tools',
       'config:block.block.bartik_login',
       'config:block.block.bartik_footer',
+      'config:block.block.bartik_help',
+      'config:block.block.bartik_search',
+      'config:block.block.' . $block->id(),
       'config:block.block.bartik_powered',
       'config:block.block.bartik_main_menu',
       'config:block.block.bartik_account_menu',
@@ -123,6 +129,8 @@ class PageCacheTagsIntegrationTest extends WebTestBase {
       'config:block.block.bartik_content',
       'config:block.block.bartik_tools',
       'config:block.block.bartik_login',
+      'config:block.block.bartik_help',
+      'config:block.block.bartik_search',
       'config:block.block.' . $block->id(),
       'config:block.block.bartik_footer',
       'config:block.block.bartik_powered',

core/modules/page_cache/src/Tests/PageCacheTest.php

@@ -67,6 +67,7 @@ class PageCacheTest extends WebTestBase {
     $cache_entry = \Drupal::cache('render')->get($cid);
     sort($cache_entry->tags);
     $expected_tags = array(
+      'config:user.role.anonymous',
       'pre_render',
       'rendered',
       'system_test_cache_tags_page',
@@ -384,17 +385,25 @@ class PageCacheTest extends WebTestBase {
     // Install the module that provides the test form.
     $this->container->get('module_installer')
       ->install(['page_cache_form_test']);
+    // Uninstall the page_cache module to verify that form is immutable
+    // regardless of the internal page cache module.
+    $this->container->get('module_installer')->uninstall(['page_cache']);
     \Drupal::service('router.builder')->rebuild();
 
     $this->drupalGet('page_cache_form_test_immutability');
 
     $this->assertText("Immutable: TRUE", "Form is immutable.");
 
-    // Uninstall the page_cache module, verify the flag is not set.
-    $this->container->get('module_installer')->uninstall(['page_cache']);
+    // The immutable flag is set unconditionally by system_form_alter(), set
+    // a flag to tell page_cache_form_test_module_implements_alter() to disable
+    // that implementation.
+    \Drupal::state()->set('page_cache_bypass_form_immutability', TRUE);
+    \Drupal::moduleHandler()->resetImplementations();
+    \Drupal::cache('render')->deleteAll();
 
     $this->drupalGet('page_cache_form_test_immutability');
 
     $this->assertText("Immutable: FALSE", "Form is not immutable,");
   }
+
 }

core/modules/page_cache/tests/modules/page_cache_form_test.module

@@ -11,10 +11,30 @@ use Drupal\Core\Form\FormStateInterface;
 * Implements hook_form_FORM_ID_alter().
 */
 function page_cache_form_test_form_page_cache_form_test_alter(&$form, FormStateInterface $form_state, $form_id) {
+  // This runs earlier than system_form_alter() so we fore-go the immutability
+  // check to the process callback, by which time system_form_alter() has run.
+  $form['#process'][] = 'page_cache_form_test_form_page_cache_form_test_process';
+}
+
+/**
+ * Process callback to check immutability.
+ */
+function page_cache_form_test_form_page_cache_form_test_process($form, FormStateInterface $form_state) {
   if (isset($form_state->getBuildInfo()['immutable']) && $form_state->getBuildInfo()['immutable']) {
     $form['#suffix'] = 'Immutable: TRUE';
   }
   else {
     $form['#suffix'] = 'Immutable: FALSE';
   }
+  return $form;
+}
+
+/**
+ * Implements hook_module_implements_alter().
+ */
+function page_cache_form_test_module_implements_alter(&$implementations, $hook) {
+  if ($hook === 'form_alter' && \Drupal::state()->get('page_cache_bypass_form_immutability', FALSE)) {
+    // Disable system_form_alter
+    unset($implementations['system']);
+  }
 }