Merge branch '2.3' into 2.4

* 2.3:
  changed some PHPUnit assertions to more specific ones
  fixed Kernel::stripComments() normalizing new-lines
  added a BC comment
  Update FileLoader to fix issue #10339

Author: fabpot

Tests/ApplicationTest.php

@@ -102,11 +102,11 @@ public function testAll()
     {
         $application = new Application();
         $commands = $application->all();
-        $this->assertEquals('Symfony\\Component\\Console\\Command\\HelpCommand', get_class($commands['help']), '->all() returns the registered commands');
+        $this->assertInstanceOf('Symfony\\Component\\Console\\Command\\HelpCommand', $commands['help'], '->all() returns the registered commands');
 
         $application->add(new \FooCommand());
         $commands = $application->all('foo');
-        $this->assertEquals(1, count($commands), '->all() takes a namespace as its first argument');
+        $this->assertCount(1, $commands, '->all() takes a namespace as its first argument');
     }
 
     public function testRegister()
@@ -535,8 +535,8 @@ public function testRun()
         $application->run();
         ob_end_clean();
 
-        $this->assertSame('Symfony\Component\Console\Input\ArgvInput', get_class($command->input), '->run() creates an ArgvInput by default if none is given');
-        $this->assertSame('Symfony\Component\Console\Output\ConsoleOutput', get_class($command->output), '->run() creates a ConsoleOutput by default if none is given');
+        $this->assertInstanceOf('Symfony\Component\Console\Input\ArgvInput', $command->input, '->run() creates an ArgvInput by default if none is given');
+        $this->assertInstanceOf('Symfony\Component\Console\Output\ConsoleOutput', $command->output, '->run() creates a ConsoleOutput by default if none is given');
 
         $application = new Application();
         $application->setAutoExit(false);