[READ-ONLY] Subtree split of the Symfony WebPofiler Bundle
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Latest commit fce6166 Aug 22, 2016 @fabpot fabpot feature #19339 [WebProfilerBundle][Form][DX] To expand the form nodes…
… that contains children with errors (yceruto)

This PR was squashed before being merged into the 3.2-dev branch (closes #19339).

Discussion
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[WebProfilerBundle][Form][DX] To expand the form nodes that contains children with errors

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

Currently when we use nested forms and an error occurs into one of them, it's not displayed "easily" in the form panel profiler:

![first](https://cloud.githubusercontent.com/assets/2028198/17125622/1fd15142-52c3-11e6-830e-17b3e341ba60.png)

This happen because only the root form is expanded and the children are shown collapsed "by default".

**The main problem is to search where is the form with error**.

The purpose of this PR is to show expanded all forms that contains children with error, reducing a little bit the developer's time when debugging.

PR result when we access to the form panel profiler:

![form-error-result](https://cloud.githubusercontent.com/assets/2028198/17125447/83eb9c0c-52c1-11e6-94bc-a2a7492eea43.png)

In red the full path to the error.

![form-error-result2](https://cloud.githubusercontent.com/assets/2028198/17125459/a04de95e-52c1-11e6-8980-84a5dcd0914a.png)

Commits
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d626b28 [WebProfilerBundle][Form][DX] To expand the form nodes that contains children with errors

README.md