fix #9321 Crawler::addHtmlContent add gbk encoding support
use restore_error_handler instead of set_error_handler($previous)
fix some cs
Merge branch '2.3' into 2.4

* 2.3:
  fix some cs
  use restore_error_handler instead of set_error_handler($previous)
  fix #9321 Crawler::addHtmlContent add gbk encoding support
  [Console] fixed column width when using the Table helper with some decoration in cells
  [Security] Fixed problem with losing ROLE_PREVIOUS_ADMIN role.
  Fix for cache-key conflict when having a \Traversable as choices
  [Security] removed obsolete comment

Conflicts:
	src/Symfony/Component/Console/Helper/TableHelper.php
	src/Symfony/Component/Security/Tests/Http/Firewall/ExceptionListenerTest.php