Return BC compatibility for `@Route` parameters and default values
[BrowserKit] Pass headers when `followRedirect()` is called
[Form] check the required output timezone against the actual timezone
of the input datetime object, rather than the expected timezone supplied
fix for Process:isSuccessful()
merged branch tgabi333/2.2 (PR #8815)

This PR was merged into the 2.2 branch.

Discussion
----------

[Process] fix for Process:isSuccessful()

| Q             | A
| ------------- | ---
| Bug fix?      | [yes]
| New feature?  | [no]
| BC breaks?    | [no]
| Deprecations? | [no]
| Tests pass?   | [yes]
| Fixed tickets | []
| License       | MIT
| Doc PR        | []

This is a rebase of https://github.com/symfony/symfony/pull/8801

If you call isSuccessful() on a running process you would get true because of 0 == null. I think that is not the expected behavior and that is not what phpdoc @return block said so.

Commits
-------

262879d fix for Process:isSuccessful()
added a missing use statement (closes #8808)
Fix typo in the check_path validator
merged branch unkind/security-bundle-check-path-bugfix (PR #8782)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #8782).

Discussion
----------

[SecurityBundle] Fix typo in the check_path validator

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #3005, #2954
| License       | MIT

Actually, validator of `check_path` value is broken by #3005. It doesn't throw any exception even if `check_path` is an URI.

I've faced with wrong tests class hierarchy: `SecurityExtensionTest` is abstract test and I have to create the same test configuration for every format: PHP, XML, YAML. It looks like we test `Dependency Injection` and `Yaml` components. Issue with `check_path` does not depend on format, but such class hierarchy leaves me no choice. And I can't put test case into `ConfigurationTest`, because it doesn't know anything about security factories.

It looks like it's better to create new class for `SecurityExtension` tests.

Commits
-------

155dca0 [SecurityBundle] Fix typo in the check_path validator
fixed the format of the request used to render an exception
Exclude little words of 'ee' to 'oo' plural transformation

The plural form of 'bee' and 'fee' are not 'foo' and 'boo'. In general words smaller than 3 letters doesn't change to a 'oo' form.
merged branch sumbobyboys/patch-1 (PR #8804)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #8804).

Discussion
----------

Exclude little words of 'ee' to 'oo' plural transformation

The plural form of 'bee' and 'fee' are not 'foo' and 'boo'. In general words smaller than 3 letters doesn't change to a 'oo' form.

Commits
-------

0ffdb11 Exclude little words of 'ee' to 'oo' plural transformation
Sets _format attribute only if it wasn't set previously by the user.

Fixes #8787
fixed request format of sub-requests when explicitely set by the developer (closes #8787)
[Locale] fixed build-data exit code in case of an error

When passing a message to the exit() function, PHP returns 0 instead of
an error code.
merged branch fabpot/exception-format (PR #8819)

This PR was merged into the 2.2 branch.

Discussion
----------

[HttpKernel] Fix request _format duplication for HttpKernel's ExceptionListener

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8777, #8778
| License       | MIT

This is a better fix for #8777.

Commits
-------

f946108 fixed the format of the request used to render an exception
merged branch fabpot/inline-fragment-format (PR #8821)

This PR was merged into the 2.2 branch.

Discussion
----------

Sets _format attribute only if it wasn't set previously by the user

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8787, #8791
| License       | MIT
| Doc PR        |

Commits
-------

9bb7a3d fixed request format of sub-requests when explicitely set by the developer (closes #8787)
fa35597 Sets _format attribute only if it wasn't set previously by the user.
fixed locale of sub-requests when explicitely set by the developer (refs #8821)
Fixed issue #6932 - Inconsistent locale handling in subrequests

The fix consists in passing the locale in the controller reference,
inside the routablefragment renderer.
added a functional test for locale handling in sub-requests
[HttpKernel] added a comment to warn about possible inconsistencies