Merge branch '5.3' into 5.4

* 5.3:
  [Tests] Remove some unused fixtures
  added missing translations for portuguese [#43726]
  [HttpClient][Mime] Add correct IDN flags for IDNA2008 compliance
  properly parse quoted strings tagged with !!str
  do not merge label classes into expanded choice labels
  [Serializer] PropertyNormalizer - return unique (i.e. filter duplicate ) attributes in extractAttributes function

Author: derrabus

HttpClientTrait.php

@@ -496,7 +496,7 @@ private static function parseUrl(string $url, array $query = [], array $allowedS
                 throw new InvalidArgumentException(sprintf('Unsupported IDN "%s", try enabling the "intl" PHP extension or running "composer require symfony/polyfill-intl-idn".', $host));
             }
 
-            $host = \defined('INTL_IDNA_VARIANT_UTS46') ? idn_to_ascii($host, \IDNA_DEFAULT, \INTL_IDNA_VARIANT_UTS46) ?: strtolower($host) : strtolower($host);
+            $host = \defined('INTL_IDNA_VARIANT_UTS46') ? idn_to_ascii($host, \IDNA_DEFAULT | \IDNA_USE_STD3_RULES | \IDNA_CHECK_BIDI | \IDNA_CHECK_CONTEXTJ | \IDNA_NONTRANSITIONAL_TO_ASCII, \INTL_IDNA_VARIANT_UTS46) ?: strtolower($host) : strtolower($host);
             $host .= $port ? ':'.$port : '';
         }
 

Tests/HttpClientTraitTest.php

@@ -163,6 +163,8 @@ public function provideParseUrl(): iterable
         yield [[null, null, 'bar', '?a%5Bb%5Bc%5D=d', null], 'bar?a[b[c]=d', []];
         yield [[null, null, 'bar', '?a%5Bb%5D%5Bc%5D=dd', null], 'bar?a[b][c]=d&e[f]=g', ['a' => ['b' => ['c' => 'dd']], 'e[f]' => null]];
         yield [[null, null, 'bar', '?a=b&a%5Bb%20c%5D=d&e%3Df=%E2%9C%93', null], 'bar?a=b', ['a' => ['b c' => 'd'], 'e=f' => '✓']];
+        // IDNA 2008 compliance
+        yield [['https:', '//xn--fuball-cta.test', null, null, null], 'https://fußball.test'];
     }
 
     /**