Update Sidebar on folder_contents context change

[santonelli]

Summary

A clear and concise description of the requested feature.

Related Links

• https://community.plone.org/t/solved-in-5-2-3-navigating-folder-contents-does-not-update-buttons-actions-in-the-toolbar-in-plone-5-2-2/13026
• https://github.com/plone/Products.CMFPlone/issues/3191
• https://github.com/plone/mockup/pull/1028

Acceptance Criteria

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• It's done when...

Additional context

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