Merge branch '2.8' into 3.4

* 2.8:
  [Form] Fix PHPDoc for FormConfigBuilder $dataClass argument
  [Security] Update user phpdoc on tokens
  [WebProfilerBundle] Fixed icon alignment issue using Bootstrap 4.1.2
  suppress side effects in 'get' or 'has' methods of NamespacedAttributeBag
  [HttpFoundation] reset callback on StreamedResponse when setNotModified() is called
  [HttpFoundation] Fixed phpdoc for get method of HeaderBag
  fix typo in ContainerBuilder docblock

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/toolbar.css.twig

@@ -292,6 +292,7 @@ div.sf-toolbar .sf-toolbar-block a:hover {
     border-width: 0;
     position: relative;
     top: 8px;
+    vertical-align: baseline;
 }
 
 .sf-toolbar-block .sf-toolbar-icon img + span,

src/Symfony/Component/DependencyInjection/ContainerBuilder.php

@@ -637,10 +637,10 @@ class ContainerBuilder extends Container implements TaggedContainerInterface
      * the parameters passed to the container constructor to have precedence
      * over the loaded ones.
      *
-     * $container = new ContainerBuilder(array('foo' => 'bar'));
+     * $container = new ContainerBuilder(new ParameterBag(array('foo' => 'bar')));
      * $loader = new LoaderXXX($container);
      * $loader->load('resource_name');
-     * $container->register('foo', new stdClass());
+     * $container->register('foo', 'stdClass');
      *
      * In the above example, even if the loaded resource defines a foo
      * parameter, the value will still be 'bar' as defined in the ContainerBuilder

src/Symfony/Component/Form/FormConfigBuilder.php

@@ -138,7 +138,7 @@ class FormConfigBuilder implements FormConfigBuilderInterface
     private $data;
 
     /**
-     * @var string
+     * @var string|null
      */
     private $dataClass;
 
@@ -181,7 +181,7 @@ class FormConfigBuilder implements FormConfigBuilderInterface
      * Creates an empty form configuration.
      *
      * @param string|int               $name       The form name
-     * @param string                   $dataClass  The class of the form's data
+     * @param string|null              $dataClass  The class of the form's data
      * @param EventDispatcherInterface $dispatcher The event dispatcher
      * @param array                    $options    The form options
      *

src/Symfony/Component/HttpFoundation/HeaderBag.php

@@ -101,11 +101,11 @@ class HeaderBag implements \IteratorAggregate, \Countable
     /**
      * Returns a header value by name.
      *
-     * @param string          $key     The header name
-     * @param string|string[] $default The default value
-     * @param bool            $first   Whether to return the first value or all header values
+     * @param string               $key     The header name
+     * @param string|string[]|null $default The default value
+     * @param bool                 $first   Whether to return the first value or all header values
      *
-     * @return string|string[] The first header value or default value if $first is true, an array of values otherwise
+     * @return string|string[]|null The first header value or default value if $first is true, an array of values otherwise
      */
     public function get($key, $default = null, $first = true)
     {

src/Symfony/Component/HttpFoundation/Session/Attribute/NamespacedAttributeBag.php

@@ -124,7 +124,13 @@ class NamespacedAttributeBag extends AttributeBag
 
         foreach ($parts as $part) {
             if (null !== $array && !array_key_exists($part, $array)) {
-                $array[$part] = $writeContext ? array() : null;
+                if (!$writeContext) {
+                    $null = null;
+
+                    return $null;
+                }
+
+                $array[$part] = array();
             }
 
             $array = &$array[$part];

src/Symfony/Component/HttpFoundation/StreamedResponse.php

@@ -141,4 +141,16 @@ class StreamedResponse extends Response
     {
         return false;
     }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return $this
+     */
+    public function setNotModified()
+    {
+        $this->setCallback(function () {});
+
+        return parent::setNotModified();
+    }
 }

src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php

@@ -126,7 +126,7 @@ class ResponseTest extends ResponseTestCase
 
     public function testSetNotModified()
     {
-        $response = new Response();
+        $response = new Response('foo');
         $modified = $response->setNotModified();
         $this->assertObjectHasAttribute('headers', $modified);
         $this->assertObjectHasAttribute('content', $modified);
@@ -135,6 +135,11 @@ class ResponseTest extends ResponseTestCase
         $this->assertObjectHasAttribute('statusText', $modified);
         $this->assertObjectHasAttribute('charset', $modified);
         $this->assertEquals(304, $modified->getStatusCode());
+
+        ob_start();
+        $modified->sendContent();
+        $string = ob_get_clean();
+        $this->assertEmpty($string);
     }
 
     public function testIsSuccessful()

src/Symfony/Component/HttpFoundation/Tests/Session/Attribute/NamespacedAttributeBagTest.php

@@ -82,6 +82,17 @@ class NamespacedAttributeBagTest extends TestCase
         $this->assertEquals($exists, $this->bag->has($key));
     }
 
+    /**
+     * @dataProvider attributesProvider
+     */
+    public function testHasNoSideEffect($key, $value, $expected)
+    {
+        $expected = json_encode($this->bag->all());
+        $this->bag->has($key);
+
+        $this->assertEquals($expected, json_encode($this->bag->all()));
+    }
+
     /**
      * @dataProvider attributesProvider
      */
@@ -96,6 +107,17 @@ class NamespacedAttributeBagTest extends TestCase
         $this->assertEquals('default', $this->bag->get('user2.login', 'default'));
     }
 
+    /**
+     * @dataProvider attributesProvider
+     */
+    public function testGetNoSideEffect($key, $value, $expected)
+    {
+        $expected = json_encode($this->bag->all());
+        $this->bag->get($key);
+
+        $this->assertEquals($expected, json_encode($this->bag->all()));
+    }
+
     /**
      * @dataProvider attributesProvider
      */

src/Symfony/Component/HttpFoundation/Tests/StreamedResponseTest.php

@@ -123,4 +123,22 @@ class StreamedResponseTest extends TestCase
         $this->assertInstanceOf('Symfony\Component\HttpFoundation\StreamedResponse', $response->sendHeaders());
         $this->assertInstanceOf('Symfony\Component\HttpFoundation\StreamedResponse', $response->sendHeaders());
     }
+
+    public function testSetNotModified()
+    {
+        $response = new StreamedResponse(function () { echo 'foo'; });
+        $modified = $response->setNotModified();
+        $this->assertObjectHasAttribute('headers', $modified);
+        $this->assertObjectHasAttribute('content', $modified);
+        $this->assertObjectHasAttribute('version', $modified);
+        $this->assertObjectHasAttribute('statusCode', $modified);
+        $this->assertObjectHasAttribute('statusText', $modified);
+        $this->assertObjectHasAttribute('charset', $modified);
+        $this->assertEquals(304, $modified->getStatusCode());
+
+        ob_start();
+        $modified->sendContent();
+        $string = ob_get_clean();
+        $this->assertEmpty($string);
+    }
 }

src/Symfony/Component/Security/Core/Authentication/Token/AbstractToken.php

@@ -77,14 +77,7 @@ abstract class AbstractToken implements TokenInterface
     }
 
     /**
-     * Sets the user in the token.
-     *
-     * The user can be a UserInterface instance, or an object implementing
-     * a __toString method or the username as a regular string.
-     *
-     * @param string|object $user The user
-     *
-     * @throws \InvalidArgumentException
+     * {@inheritdoc}
      */
     public function setUser($user)
     {

src/Symfony/Component/Security/Core/Authentication/Token/TokenInterface.php

@@ -47,17 +47,22 @@ interface TokenInterface extends \Serializable
     /**
      * Returns a user representation.
      *
-     * @return mixed Can be a UserInterface instance, an object implementing a __toString method,
-     *               or the username as a regular string
+     * @return string|object Can be a UserInterface instance, an object implementing a __toString method,
+     *                       or the username as a regular string
      *
      * @see AbstractToken::setUser()
      */
     public function getUser();
 
     /**
-     * Sets a user.
+     * Sets the user in the token.
      *
-     * @param mixed $user
+     * The user can be a UserInterface instance, or an object implementing
+     * a __toString method or the username as a regular string.
+     *
+     * @param string|object $user The user
+     *
+     * @throws \InvalidArgumentException
      */
     public function setUser($user);