This PR was merged into the 4.1 branch.

Discussion
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[Form] mention "help" field option in UPGRADE file

| Q             | A
| ------------- | ---
| Branch?       | 4.1 <!-- see below -->
| Bug fix?      | no
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | #...   <!-- #-prefixed issue number(s), if any -->
| License       | MIT

When you have your own Form Extension to handle help option (e.g. similar to the one mentioned in the [blog post](https://symfony.com/blog/new-in-symfony-4-1-form-field-help)), it starts to render twice in the form after upgrading to 4.1 (where #26332 was added)

<!--
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   (lowest branches are regularly merged to upper ones so they get the fixes too).
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Commits
-------

744362a update UPGRADE-4.1 for feature #26332 Form field help option

This reverts commit 9fda6d3, reversing
changes made to ca53d3e.

… (curry684)

This PR was submitted for the master branch but it was squashed and merged into the 4.1 branch instead (closes #27415).

Discussion
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Insert correct parameter_bag service in AbstractController

Reverts this feature being broken in 3051289#diff-ef10778bc68793f8c8f4b71a7ba67790R86 - `getParameter` could never work now as it was querying the container itself instead of the parameter bag.

| Q             | A
| ------------- | ---
| Branch?       | 4.1
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| License       | MIT

Also see comments at #25439 (comment)

Commits
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37270d7 Insert correct parameter_bag service in AbstractController

…(ostrolucky)" (nicolas-grekas)

This PR was merged into the 4.1 branch.

Discussion
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Revert "feature #26702 Mark ExceptionInterfaces throwable (ostrolucky)"

This reverts commit 9fda6d3, reversing
changes made to ca53d3e.

| Q             | A
| ------------- | ---
| Branch?       | 4.1
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #27419
| License       | MIT
| Doc PR        | -

#26702 introduced a BC break.

Commits
-------

2ddb89b Revert "feature #26702 Mark ExceptionInterfaces throwable (ostrolucky)"

released v4.1.0