Props suddenly hidden behind `_dashprivate_layout` about dash-renderer

[philip-peterson]

@wbrgss Thanks for that link. It would be helpful to other devs such as myself if information like this were communicated in the changelog, as it's not obvious to check the forums. Just as a case study, I was looking at the Dash changelog which indicates that dash-renderer was upgraded to v0.21, and all the dash-renderer changelog says is the following:

* Optimize rendering
* Always assign setProps to components

Again, thanks for the help!

[wbrgss]

@philip-peterson This (breaking) change was intentional, and was documented in the Dash 0.40.0 release announcement:

Note: If you were using props.children.props in your components, this will no longer work. The information about the direct children can still be accessed through _dashprivate_layout like in the dcc tabs. You can also have a look at the PRs here and here for details.

Component type information still available but only as a type/namespace string

From what I understand, the change was made because e.g. [child].props.children.props.type was ambiguous/confusing, and potentially brittle when introducing React upgrades.

[wbrgss]

It would be helpful to other devs such as myself if information like this were communicated in the changelog

Yep, agreed. cc @Marc-Andre-Rivet 😉