Merge branch '6.4' into 7.1

* 6.4:
  [FrameworkBundle] Add missing `not-compromised-password` entry in XSD
  [AssetMapper] Fix CssCompiler matches url in comments
  Add support for doctrine/persistence 4
  Ensure TransportExceptionInterface populates stream debug data
  Fix typo in validators.sk.xlf
  [Mime] Fix body validity check in `Email` when using `Message::setBody()`
  Review Arabic translations for the validator
  Fixed mistakes in proper hebrew writing in the previous translation and confirmed the rest to be correct and in the same style.
  Review translation
  [Cache] Don't clear system caches on cache:clear
  [FrameworkBundle] Fix patching refs to the tmp warmup dir in files generated by optional cache warmers
  Mark Czech Validator translation as reviewed
  [PropertyInfo] Fix `TypeTest` duplicated assert
  [HtmlSanitizer] Avoid accessing non existent array key when checking for hosts validity
  Update validators.ar.xlf
  [DomCrawler] Make `ChoiceFormField::isDisabled` return `true` for unchecked disabled checkboxes

Field/ChoiceFormField.php

@@ -45,6 +45,10 @@ public function hasValue(): bool
      */
     public function isDisabled(): bool
     {
+        if ('checkbox' === $this->type) {
+            return parent::isDisabled();
+        }
+
         if (parent::isDisabled() && 'select' === $this->type) {
             return true;
         }

Tests/Field/ChoiceFormFieldTest.php

@@ -272,6 +272,17 @@ public function testCheckboxWithEmptyBooleanAttribute()
         $this->assertEquals('foo', $field->getValue());
     }
 
+    public function testCheckboxIsDisabled()
+    {
+        $node = $this->createNode('input', '', ['type' => 'checkbox', 'name' => 'name', 'disabled' => '']);
+        $field = new ChoiceFormField($node);
+
+        $this->assertTrue($field->isDisabled(), '->isDisabled() returns true when the checkbox is disabled, even if it is not checked');
+
+        $field->tick();
+        $this->assertTrue($field->isDisabled(), '->isDisabled() returns true when the checkbox is disabled, even if it is checked');
+    }
+
     public function testTick()
     {
         $node = $this->createSelectNode(['foo' => false, 'bar' => false]);