Symfony 5.4.21 released

Symfony 5.4.21 has just been released. Here is the list of the most important changes since 5.4.20:

• bug #49526 [Security] Migrate the session on login only when the user changes (@nicolas-grekas)
• bug #49516 [Workflow] display label with new lines + colours properly when rendering a PUML dump (@alexislefebvre)
• bug #48965 [TwigBridge] Allow floats in html5 input type number field (@wimhendrikx)
• bug #48833 [Translation] Handle the translation of empty strings (@javiereguiluz)
• bug #49292 [VarDumper] Fix error when reflected class has default Enum parameter in constructor (@kapiwko)
• bug #49493 [FrameworkBundle] Fix denyAccessUnlessGranted for mixed attributes (@delbertooo)
• bug #49484 [Validator] Fix translation of AtLeastOneOf constraint message (@alexandre-daubois)
• bug #48998 [Validator] Sync IBAN formats with Swift IBAN registry (@smelesh)
• bug #49405 [MonologBridge] FirePHPHandler::onKernelResponse throws PHP 8.1 deprecation when no user agent is set (@juagarc4)
• bug #49421 [TwigBridge] do not drop embed label classes (@xabbuh)
• bug #49422 [Cache][Messenger] fixed CallbackInterface support in async expiration handler (@AdamKatzDev)
• bug #49441 [Contracts] Fix setting $container before calling parent::setContainer in ServiceSubscriberTrait (@edsrzf)
• bug #49272 [Workflow] remove new lines from workflow metadata (@alexislefebvre)
• bug #49427 [WebProfilerBundle] Render original (not encoded) email headers (@1ed)
• bug #49368 [BC Break] Make data providers for abstract test cases static (@OskarStark, @alexandre-daubois)
• bug #49385 [Notifier] Make TransportTestCase data providers static (@alexandre-daubois)
• bug #49395 fix trying to load Memcached before checking we can (@nicolas-grekas)
• bug #49326 [Notifier] Fix notifier profiler when transport name is null (@fabpot)
• bug #49265 [HttpKernel] Fix setting the session on the main request when it's started by a subrequest (@nicolas-grekas)
• bug #49353 [Cache] Only validate dbindex parameter when applicable (@loevgaard)
• bug #49346 [ErrorHandler] Do not patch return statements in closures (@wouterj)
• bug #49334 [DependencyInjection] keep proxy tag on original definition when decorating (@kbond)
• bug #47946 [FrameworkBundle] Fix checkboxes check assertions (@MatTheCat)
• bug #49301 [HttpClient] Fix data collector (@fancyweb)
• bug #49310 [Notifier][WebProfilerBundle] Ignore messages whose getNotification returns null (@MatTheCat)
• bug #49299 [HttpClient] Fix over-encoding of URL parts to match browser's behavior (@nicolas-grekas)
• bug #49214 [Mailer] add Sender to the list of bypassed headers (@xabbuh)
• bug #49245 [Serializer] Fix CsvEncoder decode on empty data (@cazak)
• bug #49249 [Dotenv] Fix phpdoc Dotenv (@alamirault)
• bug #49248 [Config] Fix phpdoc nullable (@alamirault)
• bug #48880 [Response] getMaxAge() returns non-negative integer (@pkruithof, @fabpot)
• bug #49207 [PropertyInfo] Add meaningful message when phpstan/phpdoc-parser is not installed when using PhpStanExtractor (@alexandre-daubois)
• bug #49220 [Validator] Make ConstraintValidatorTestCase compatible with PHPUnit 10 (@gjuric)
• bug #49226 [WebProfilerBundle] Disable Turbo for debug toolbar links (@javiereguiluz)
• bug #49223 [WebProfilerBundle] Fix some minor HTML issues (@javiereguiluz)
• bug #49146 [PropertyInfo] fail with a meaningful error when a needed package is missing (@xabbuh)
• bug #49187 [Ldap] Allow multiple values on extra_fields (@mvhirsch)
• bug #49128 [DependencyInjection] Fix combinatory explosion when autowiring union and intersection types (@nicolas-grekas)

Want to upgrade to this new release? Because Symfony protects backwards-compatibility very closely, this should be quite easy. Use SymfonyInsight upgrade reports to detect the code you will need to change in your project and read our upgrade documentation to learn more.

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