bug #9397 [BUG][Form] Fix nonexistent key id in twig of data collector (francoispluchino)

This PR was merged into the master branch.

Discussion
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[BUG][Form] Fix nonexistent key id in twig of data collector

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

When you create a single button form type, the id of data collector does not exist. It's caused by the PR #9394.

Commits
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19c74f3 Fix nonexistent key id in twig of data collector
minor #9389 [FrameworkBundle] Update deprecation message (asm89)

This PR was merged into the master branch.

Discussion
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[FrameworkBundle] Update deprecation message

Small addition to (doc string only):
https://github.com/symfony/symfony/pull/9252

Commits
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b057fab [FrameworkBundle] Update deprecation message
fixed CS
Merge branch '2.2' into 2.3

* 2.2:
  fixed CS
  Fixed the error handling when decoding invalid XML to avoid a Warning
  [Form] Fixed: The "data" option is taken into account even if it is NULL
  [DomCrawler] [HttpFoundation] Make `Content-Type` attributes identification case-insensitive

Conflicts:
	src/Symfony/Component/Form/Extension/Core/Type/FormType.php
fixed CS
Merge branch '2.3'

* 2.3:
  fixed CS
  fixed CS
  [HttpKernel] fixed memory limit display in MemoryDataCollector
  Fixed the error handling when decoding invalid XML to avoid a Warning
  [Form] Fixed: The "data" option is taken into account even if it is NULL
  [DomCrawler] [HttpFoundation] Make `Content-Type` attributes identification case-insensitive

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TimedPhpEngineTest.php
fixed CS
[Process] Renamed flushOutput() and flushErrorOutput() to clearOutput() and clearErrorOutput()
[Form] Fixed failing FormDataExtractorTest
bug #9408 [Form] Fixed failing FormDataExtractorTest (bschussek)

This PR was merged into the master branch.

Discussion
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[Form] Fixed failing FormDataExtractorTest

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

Commits
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4807c5e [Form] Fixed failing FormDataExtractorTest
updated CHANGELOG for 2.4.0-BETA2
updated VERSION for 2.4.0-BETA2
bumped Symfony version to 2.4.0
added content length header to BinaryFileResponse
bug #9412 [HttpFoundation] added content length header to BinaryFileResponse (kbond)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #9412).

Discussion
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[HttpFoundation] added content length header to BinaryFileResponse

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9256, #7684
| License       | MIT
| Doc PR        | n/a

Commits
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e75a556 added content length header to BinaryFileResponse
Add X-Debug-Url profiler url header
update CONTRIBUTORS
fixed issue with clone now the children of the original form are preserved and the clone form is given new children
[HttpKernel] added missing use statement
[Form] fix CsrfProviderAdapter