Merge branch '4.3' into 4.4

* 4.3:
  Fix typo
  Fix unitialized variable in DeprecationErrorHandler
  fix Danish translations
  Added the missing translations for the Slovak 'sk' locale.
  [HttpFoundation] Clear invalid session cookie
  Fix tst patern to handle callstack with/without return typehint
  Fix negative DateInterval

Author: nicolas-grekas

DeprecationErrorHandler.php

@@ -74,8 +74,6 @@ public static function register($mode = 0)
             return;
         }
 
-        self::$isAtLeastPhpUnit83 = !class_exists('PHPUnit_Util_ErrorHandler') && method_exists(ErrorHandler::class, '__invoke');
-
         $handler = new self();
         $oldErrorHandler = set_error_handler([$handler, 'handleError']);
 
@@ -316,6 +314,9 @@ private function displayDeprecations($groups, $configuration)
 
     private static function getPhpUnitErrorHandler()
     {
+        if (!isset(self::$isAtLeastPhpUnit83)) {
+            self::$isAtLeastPhpUnit83 = class_exists(ErrorHandler::class) && method_exists(ErrorHandler::class, '__invoke');
+        }
         if (!self::$isAtLeastPhpUnit83) {
             return 'PHPUnit\Util\ErrorHandler::handleError';
         }

bin/simple-phpunit.php

@@ -10,7 +10,7 @@
  */
 
 // Please update when phpunit needs to be reinstalled with fresh deps:
-// Cache-Id-Version: 2019-07-04 18:00 UTC
+// Cache-Id: 2019-08-09 13:00 UTC
 
 error_reporting(-1);