Merge branch '2.3'

* 2.3:
  moved some fixed dep versions from 2.2.* to ~2.2 (refs #8613)
  [HttpKernel] added a missing dep for dev
  [Form] fixed wrong call to setTimeZone() (closes #8644)
  Fix issue with \DateTimeZone::UTC / 'UTC' for PHP 5.4
  [Form] Fixed patched forms to be valid even if children are not submitted
  Revert "[Form] Fix of "PATCH'ed forms are never valid""
  [Form] Fixed: If a form is not present in a request, it is not automatically submitted
  Fixes link indices
  [Form] Removed the "disabled" attribute from the placeholder option in select fields due to problems with the BlackBerry 10 browser
  Revert "[Form] Remove "value" attribute on empty_value option"
  [routing] added ability for apache matcher to handle array values
  removed dead code and fixed CS
  [Validator] fixed StaticMethodLoader trying to invoke methods of abstract classes (closes #8589)

Author: fabpot

Resources/views/Form/choice_widget_collapsed.html.php

@@ -2,7 +2,7 @@
     <?php echo $view['form']->block($form, 'widget_attributes') ?>
     <?php if ($multiple): ?> multiple="multiple"<?php endif ?>
 >
-    <?php if (null !== $empty_value): ?><option <?php if ($required):?> disabled="disabled"<?php if (empty($value) && "0" !== $value): ?> selected="selected"<?php endif ?><?php else: ?> value=""<?php endif?>><?php echo $view->escape($view['translator']->trans($empty_value, array(), $translation_domain)) ?></option><?php endif; ?>
+    <?php if (null !== $empty_value): ?><option value=""<?php if ($required and empty($value) && "0" !== $value): ?> selected="selected"<?php endif?>><?php echo $view->escape($view['translator']->trans($empty_value, array(), $translation_domain)) ?></option><?php endif; ?>
     <?php if (count($preferred_choices) > 0): ?>
         <?php echo $view['form']->block($form, 'choice_widget_options', array('choices' => $preferred_choices)) ?>
         <?php if (count($choices) > 0 && null !== $separator): ?>

Tests/Functional/Bundle/TestBundle/Controller/FragmentController.php

@@ -11,7 +11,6 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\Controller;
 
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\DependencyInjection\ContainerAware;