Merge branch '2.7' into 2.8

* 2.7:
  Typo fix
  [2.3] Static Code Analysis for Components
  Added support \IteratorAggregate for UniqueEntityValidator
  Update AbstractChoiceListTest.php
  Fix #17306 Paths with % in it are note allowed (like urlencoded)
  Use proper class to fetch $versionStrategy property
  Added sort order SORT_STRING for params in UriSigner
  Remove normalizer cache in Serializer class

Author: fabpot

Container.php

@@ -580,7 +580,7 @@ public static function camelize($id)
      */
     public static function underscore($id)
     {
-        return strtolower(preg_replace(array('/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'), array('\\1_\\2', '\\1_\\2'), strtr($id, '_', '.')));
+        return strtolower(preg_replace(array('/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'), array('\\1_\\2', '\\1_\\2'), str_replace('_', '.', $id)));
     }
 
     private function __clone()

Extension/Extension.php

@@ -91,9 +91,7 @@ public function getConfiguration(array $config, ContainerBuilder $container)
             $container->addResource(new FileResource($r->getFileName()));
 
             if (!method_exists($class, '__construct')) {
-                $configuration = new $class();
-
-                return $configuration;
+                return new $class();
             }
         }
     }

Loader/XmlFileLoader.php

@@ -93,8 +93,9 @@ private function parseImports(\DOMDocument $xml, $file)
             return;
         }
 
+        $defaultDirectory = dirname($file);
         foreach ($imports as $import) {
-            $this->setCurrentDir(dirname($file));
+            $this->setCurrentDir($defaultDirectory);
             $this->import($import->getAttribute('resource'), null, (bool) XmlUtils::phpize($import->getAttribute('ignore-errors')), $file);
         }
     }

Loader/YamlFileLoader.php

@@ -95,12 +95,13 @@ private function parseImports($content, $file)
             throw new InvalidArgumentException(sprintf('The "imports" key should contain an array in %s. Check your YAML syntax.', $file));
         }
 
+        $defaultDirectory = dirname($file);
         foreach ($content['imports'] as $import) {
             if (!is_array($import)) {
                 throw new InvalidArgumentException(sprintf('The values in the "imports" key should be arrays in %s. Check your YAML syntax.', $file));
             }
 
-            $this->setCurrentDir(dirname($file));
+            $this->setCurrentDir($defaultDirectory);
             $this->import($import['resource'], null, isset($import['ignore_errors']) ? (bool) $import['ignore_errors'] : false, $file);
         }
     }