Merge branch '4.4' into 5.1

* 4.4:
  fix merge
  Remove branch-version (keep them for contracts only)
  [HttpClient] relax auth bearer format requirements
  [PHPUnitBridge] Silence errors from mkdir()
  [DependencyInjection] Preload classes with union types correctly.
  [Serializer] fix decoding float XML attributes starting with 0
  add missing dutch translations
  Support PHPUnit 8 and PHPUnit 9 in constraint compatibility trait
  Add expectDeprecation, expectNotice, expectWarning, and expectError to TestCase polyfill
  Add missing exporter function for PHPUnit 7
  [Validator] Add missing romanian translations
  [Cache] Use correct expiry in ChainAdapter
  do not translate null placeholders or titles

Resources/views/Form/form_div_layout.html.twig

@@ -466,7 +466,7 @@
     {%- for attrname, attrvalue in attr -%}
         {{- " " -}}
         {%- if attrname in ['placeholder', 'title'] -%}
-            {{- attrname }}="{{ translation_domain is same as(false) ? attrvalue : attrvalue|trans(attr_translation_parameters, translation_domain) }}"
+            {{- attrname }}="{{ translation_domain is same as(false) or attrvalue is null ? attrvalue : attrvalue|trans(attr_translation_parameters, translation_domain) }}"
         {%- elseif attrvalue is same as(true) -%}
             {{- attrname }}="{{ attrname }}"
         {%- elseif attrvalue is not same as(false) -%}

composer.json

@@ -77,8 +77,5 @@
             "/Tests/"
         ]
     },
-    "minimum-stability": "dev",
-    "extra": {
-        "branch-version": "5.1"
-    }
+    "minimum-stability": "dev"
 }