Merge branch '6.4' into 7.1

* 6.4:
  fix functional tests
  fix merge
  fix XSD to allow to configure locks without resources

Author: xabbuh

Resources/config/schema/symfony-1.0.xsd

@@ -531,7 +531,7 @@
 
     <xsd:complexType name="lock">
         <xsd:sequence>
-            <xsd:element name="resource" type="lock_resource" minOccurs="1" maxOccurs="unbounded" />
+            <xsd:element name="resource" type="lock_resource" minOccurs="0" maxOccurs="unbounded" />
         </xsd:sequence>
         <xsd:attribute name="enabled" type="xsd:boolean" />
     </xsd:complexType>

Tests/DependencyInjection/Fixtures/xml/lock.xml

@@ -8,8 +8,6 @@
     <framework:config http-method-override="false" handle-all-throwables="true">
         <framework:annotations enabled="false" />
         <framework:php-errors log="true" />
-        <framework:lock>
-            <framework:resource>semaphore</framework:resource>
-        </framework:lock>
+        <framework:lock />
     </framework:config>
 </container>

Tests/DependencyInjection/FrameworkExtensionTestCase.php

@@ -56,6 +56,7 @@
 use Symfony\Component\HttpFoundation\IpUtils;
 use Symfony\Component\HttpKernel\DependencyInjection\LoggerPass;
 use Symfony\Component\HttpKernel\Fragment\FragmentUriGeneratorInterface;
+use Symfony\Component\Lock\Store\SemaphoreStore;
 use Symfony\Component\Messenger\Bridge\AmazonSqs\Transport\AmazonSqsTransportFactory;
 use Symfony\Component\Messenger\Bridge\Amqp\Transport\AmqpTransportFactory;
 use Symfony\Component\Messenger\Bridge\Beanstalkd\Transport\BeanstalkdTransportFactory;
@@ -2392,7 +2393,12 @@ public function testDefaultLock()
 
         self::assertTrue($container->hasDefinition('lock.default.factory'));
         $storeDef = $container->getDefinition($container->getDefinition('lock.default.factory')->getArgument(0));
-        self::assertEquals(new Reference('semaphore'), $storeDef->getArgument(0));
+
+        if (class_exists(SemaphoreStore::class) && SemaphoreStore::isSupported()) {
+            self::assertEquals(new Reference('semaphore'), $storeDef->getArgument(0));
+        } else {
+            self::assertEquals(new Reference('flock'), $storeDef->getArgument(0));
+        }
     }
 
     public function testNamedLocks()