Merge branch '3.4' into 4.1

* 3.4:
  [DependencyInjection] Fix tags on multiple decorated service

Author: nicolas-grekas

src/Symfony/Component/DependencyInjection/Compiler/DecoratorServicePass.php

@@ -34,6 +34,7 @@ public function process(ContainerBuilder $container)
             }
             $definitions->insert(array($id, $definition), array($decorated[2], --$order));
         }
+        $decoratingDefinitions = array();
 
         foreach ($definitions as list($id, $definition)) {
             list($inner, $renamedId) = $definition->getDecoratedService();
@@ -54,12 +55,18 @@ public function process(ContainerBuilder $container)
                 $container->setAlias($renamedId, new Alias((string) $alias, false));
             } else {
                 $decoratedDefinition = $container->getDefinition($inner);
-                $definition->setTags(array_merge($decoratedDefinition->getTags(), $definition->getTags()));
                 $public = $decoratedDefinition->isPublic();
                 $private = $decoratedDefinition->isPrivate();
                 $decoratedDefinition->setPublic(false);
-                $decoratedDefinition->setTags(array());
                 $container->setDefinition($renamedId, $decoratedDefinition);
+                $decoratingDefinitions[$inner] = $decoratedDefinition;
+            }
+
+            if (isset($decoratingDefinitions[$inner])) {
+                $decoratingDefinition = $decoratingDefinitions[$inner];
+                $definition->setTags(array_merge($decoratingDefinition->getTags(), $definition->getTags()));
+                $decoratingDefinition->setTags(array());
+                $decoratingDefinitions[$inner] = $definition;
             }
 
             $container->setAlias($inner, $id)->setPublic($public)->setPrivate($private);

src/Symfony/Component/DependencyInjection/Tests/Compiler/DecoratorServicePassTest.php

@@ -144,6 +144,29 @@ public function testProcessMovesTagsFromDecoratedDefinitionToDecoratingDefinitio
         $this->assertEquals(array('bar' => array('attr' => 'baz'), 'foobar' => array('attr' => 'bar')), $container->getDefinition('baz')->getTags());
     }
 
+    public function testProcessMovesTagsFromDecoratedDefinitionToDecoratingDefinitionMultipleTimes()
+    {
+        $container = new ContainerBuilder();
+        $container
+            ->register('foo')
+            ->setPublic(true)
+            ->setTags(array('bar' => array('attr' => 'baz')))
+        ;
+        $container
+            ->register('deco1')
+            ->setDecoratedService('foo', null, 50)
+        ;
+        $container
+            ->register('deco2')
+            ->setDecoratedService('foo', null, 2)
+        ;
+
+        $this->process($container);
+
+        $this->assertEmpty($container->getDefinition('deco1')->getTags());
+        $this->assertEquals(array('bar' => array('attr' => 'baz')), $container->getDefinition('deco2')->getTags());
+    }
+
     protected function process(ContainerBuilder $container)
     {
         $repeatedPass = new DecoratorServicePass();