Merge branch '3.4' into 4.2

* 3.4:
  [TwigBridge] Fix test
  Remove unnecessary ProgressBar stdout writes (fixes flickering)
  [Validator] improve translations for albanian ("sq") locale
  [VarDumper] fix serializing Stub instances
  Don't resolve the Deprecation error handler mode until a deprecation is triggered
  bug #30245 fix lost namespace in eval (fizzka)
  [Twig] removed usage of non-namespaced classes
  added missing dot
  Update validators.lt.xlf
  #30172 Add the missing validation translations for the Luxembourgish …
  [Debug][ErrorHandler] Preserve next error handler

Author: fabpot

DeprecationErrorHandler.php

@@ -98,15 +98,15 @@ public static function register($mode = 0)
             'legacyCount' => 0,
             'otherCount' => 0,
             'remaining vendorCount' => 0,
-            'unsilenced' => [],
-            'remaining' => [],
-            'legacy' => [],
-            'other' => [],
-            'remaining vendor' => [],
+            'unsilenced' => array(),
+            'remaining' => array(),
+            'legacy' => array(),
+            'other' => array(),
+            'remaining vendor' => array(),
         ];
-        $deprecationHandler = function ($type, $msg, $file, $line, $context = []) use (&$deprecations, $getMode, $UtilPrefix, $inVendors) {
+        $deprecationHandler = function ($type, $msg, $file, $line, $context = array()) use (&$deprecations, $getMode, $UtilPrefix, $inVendors) {
             $mode = $getMode();
-            if ((E_USER_DEPRECATED !== $type && E_DEPRECATED !== $type) || self::MODE_DISABLED === $mode) {
+            if ((E_USER_DEPRECATED !== $type && E_DEPRECATED !== $type) || DeprecationErrorHandler::MODE_DISABLED === $mode) {
                 $ErrorHandler = $UtilPrefix.'ErrorHandler';
 
                 return $ErrorHandler::handleError($type, $msg, $file, $line, $context);