Merge branch '6.0' into 6.1

* 6.0:
  [LokaliseBridge] Fix push command --delete-missing options when there are no missing messages
  fix bad help message in cache warmup command
  [Console] Fix OutputFormatterStyleStack::getCurrent return type
  Count cookie parts before accessing the second
  Fix RequestStack state if throwable is thrown
  [Serializer] Fix caching context-aware encoders/decoders in ChainEncoder/ChainDecoder

Author: fabpot

Command/CacheWarmupCommand.php

@@ -53,11 +53,6 @@ protected function configure()
 
 Before running this command, the cache must be empty.
 
-This command does not generate the classes cache (as when executing this
-command, too many classes that should be part of the cache are already loaded
-in memory). Use <comment>curl</comment> or any other similar tool to warm up
-the classes cache if you want.
-
 EOF
             )
         ;