Allow the ContentBrowserWidget to be used inside an object widget

[ale-rt]

Fixes #230

[mister-roboto]

@ale-rt thanks for creating this Pull Request and helping to improve Plone!

TL;DR: Finish pushing changes, pass all other checks, then paste a comment:

@jenkins-plone-org please run jobs

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass, but it takes 30-60 min. Other CI checks are usually much faster and the Plone Jenkins resources are limited, so when done pushing changes and all other checks pass either start all Jenkins PR jobs yourself, or simply add the comment above in this PR to start all the jobs automatically.

Happy hacking!

[ale-rt]

@jenkins-plone-org please run jobs

[Copilot]

Pull Request Overview

This PR enables the ContentBrowserWidget to work properly when used inside an ObjectWidget. It updates the logic for determining the view context—both in the ContentBrowserWidget itself and in the get_widget_form helper—as well as adds the necessary imports and documentation updates.

• Adjusts view context resolution in ContentBrowserWidget.get_pattern_options by handling ObjectWidget instances.
• Modifies get_widget_form in utils.py to recursively retrieve the proper form for ObjectWidget.
• Updates news documentation.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
plone/app/z3cform/widgets/contentbrowser.py	Updates view_context evaluation to support ObjectWidget usage.
plone/app/z3cform/utils.py	Adds recursion handling for ObjectWidget in get_widget_form.
news/230.bugfix.rst	Adds an entry documenting the bugfix.

[ale-rt]

I found some issue while working on https://github.com/collective/collective.z3cform.captionedrelationfield, which has a relation field inside an object field.

The issues are fixed by:

• @@getSource supports object widgets plone.app.content#304
• Allow the ContentBrowserWidget to be used inside an object widget #231
• Fix traversing to widgets nested in an object widget plone.z3cform#30

[mauritsvanrees]

I confirm the problem and the fix.