Language metadata fixes.

Author: pmelab

modules/graphql_core/tests/src/Kernel/Blocks/BlockTest.php

@@ -67,6 +67,10 @@ public function testStaticBlocks() {
     $query = $this->getQueryFromFile('Blocks/blocks.gql');
     $metadata = $this->defaultCacheMetaData();
 
+    $metadata->addCacheContexts([
+      'languages:language_content',
+    ]);
+
     // TODO: Check cache metadata.
     $metadata->addCacheTags([
       'config:block_list',

modules/graphql_core/tests/src/Kernel/GraphQLContentTestBase.php

@@ -29,6 +29,12 @@ class GraphQLContentTestBase extends GraphQLCoreTestBase {
     'text',
   ];
 
+  protected function defaultCacheContexts() {
+    return array_merge([
+      'languages:language_content',
+    ], parent::defaultCacheContexts());
+  }
+
   /**
    * {@inheritdoc}
    */

modules/graphql_core/tests/src/Kernel/GraphQLCoreTestBase.php

@@ -25,7 +25,6 @@ protected function defaultCacheTags() {
       'entity_bundles',
       'entity_types',
       'entity_field_info',
-      'languages:language_content',
     ], parent::defaultCacheTags());
   }
 

src/Plugin/Deriver/PluggableSchemaDeriver.php

@@ -98,7 +98,11 @@ public function getDerivativeDefinitions($basePluginDefinition) {
 
     $cacheContexts = array_reduce($managers, function ($carry, CacheableDependencyInterface $current) {
       return Cache::mergeContexts($carry, $current->getCacheContexts());
-    }, []);
+    }, [
+      // As long as the endpoint url language might have effect, we have to
+      // keep it.
+      'languages:language_url',
+    ]);
 
     $cacheMaxAge = array_reduce($managers, function ($carry, CacheableDependencyInterface $current) {
       return Cache::mergeMaxAges($carry, $current->getCacheMaxAge());
@@ -375,4 +379,4 @@ protected function buildMutationMap(MutationPluginManager $manager) {
     }, $mutations);
   }
 
-}
+}