Merge branch '5.4' into 6.0

* 5.4:
  [FrameworkBundle] fix merge
  [FrameworkBundle] Filter out trans paths that are covered by a parent folder path
  [Form] fix tests
  [Serializer] Fixed framework.serializer.default_context is not working for JsonEncoder
  [Ldap] Do not run ldap_set_option on failed connection
  Correct compare float data
  Fix AbstractFormLoginAuthenticator return types (fixes #47571).
  Run composer with --ignore-platform-req=php+
  [FrameworkBundle] Fix a phpdoc in mailer assertions

Tests/StopwatchPeriodTest.php

@@ -40,7 +40,7 @@ public function testGetEndTime($end, $useMorePrecision, $expected)
     public function testGetDuration($start, $end, $useMorePrecision, $duration)
     {
         $period = new StopwatchPeriod($start, $end, $useMorePrecision);
-        $this->assertSame($duration, $period->getDuration());
+        $this->assertEqualsWithDelta($duration, $period->getDuration(), \PHP_FLOAT_EPSILON);
     }
 
     public function provideTimeValues()