Fix condition when ID generator setting shall have defaults added

We need to fill in the defaults only for the class where the ID definition occurs for the first (only) time.

Author: mpdude

lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php

@@ -135,7 +135,10 @@ protected function doLoadMetadata($class, $parent, $rootEntityFound, array $nonS
             throw MappingException::reflectionFailure($class->getName(), $e);
         }
 
-        $this->completeIdGeneratorMapping($class);
+        // Complete id generator mapping when the generator was declared/added in this class
+        if ($class->identifier && (! $parent || ! $parent->identifier)) {
+            $this->completeIdGeneratorMapping($class);
+        }
 
         if (! $class->isMappedSuperclass) {
             foreach ($class->embeddedClasses as $property => $embeddableClass) {

tests/Doctrine/Tests/ORM/Functional/Ticket/GH10454Test.php

@@ -9,6 +9,9 @@
 use Doctrine\Tests\OrmTestCase;
 use Generator;
 
+use function get_parent_class;
+use function method_exists;
+
 class GH10454Test extends OrmTestCase
 {
     /**