Merge branch '2.3' into 2.4

* 2.3:
  Update validators.eu.xlf
  fixed CS
  remove unused imports
  Unify null comparisons
  [EventDispatcher] don't count empty listeners
  [Process] Fix unit tests in sigchild environment
  [Process] fix signal handling in wait()
  [BrowserKit] refactor code and fix unquoted regex
  Fixed server HTTP_HOST port uri conversion
  Bring code into standard
  [Process] Add test to verify fix for issue #11421
  [Process] Fixes issue #11421
  [DependencyInjection] Pass a Scope instance instead of a scope name.

Conflicts:
	src/Symfony/Component/EventDispatcher/Tests/EventDispatcherTest.php

Adapter/AbstractFindAdapter.php

@@ -16,7 +16,6 @@
 use Symfony\Component\Finder\Shell\Shell;
 use Symfony\Component\Finder\Expression\Expression;
 use Symfony\Component\Finder\Shell\Command;
-use Symfony\Component\Finder\Iterator\SortableIterator;
 use Symfony\Component\Finder\Comparator\NumberComparator;
 use Symfony\Component\Finder\Comparator\DateComparator;
 

Tests/Iterator/MockSplFileInfo.php

@@ -50,7 +50,7 @@ public function __construct($param)
 
     public function isFile()
     {
-        if ($this->type === null) {
+        if (null === $this->type) {
             return preg_match('/file/', $this->getFilename());
         };
 
@@ -59,7 +59,7 @@ public function isFile()
 
     public function isDir()
     {
-        if ($this->type === null) {
+        if (null === $this->type) {
             return preg_match('/directory/', $this->getFilename());
         }
 
@@ -68,7 +68,7 @@ public function isDir()
 
     public function isReadable()
     {
-        if ($this->mode === null) {
+        if (null === $this->mode) {
             return preg_match('/r\+/', $this->getFilename());
         }