Merge branch '5.2' into 5.x

* 5.2:
  Fixes symfony#14814 Default behavior about unpacking packs by Flex changed

Author: javiereguiluz

setup.rst

@@ -210,12 +210,11 @@ For example, to add debugging features in your application, you can run the
 which in turn installs several packages like ``symfony/debug-bundle``,
 ``symfony/monolog-bundle``, ``symfony/var-dumper``, etc.
 
-By default, when installing Symfony packs, your ``composer.json`` file shows the
-pack dependency (e.g. ``"symfony/debug-pack": "^1.0"``) instead of the actual
-packages installed. To show the packages, add the ``--unpack`` option when
-installing a pack (e.g. ``composer require debug --dev --unpack``) or run this
-command to unpack the already installed packs: ``composer unpack PACK_NAME``
-(e.g. ``composer unpack debug``).
+You won't see the ``symfony/debug-pack`` dependency in your ``composer.json``,
+as Flex automatically unpacks the pack. This means that it only adds the real
+packages as dependencies (e.g. you will see a new ``symfony/var-dumper`` in
+``require-dev``). While it is not recommended, you can use the ``composer
+require --no-unpack ...`` option to disable unpacking.
 
 .. _security-checker: