Re-order children incompatibility with content_moderation

Issue information

From user: sime

Contribution record

Fork management

Problem/Motivation

When using content moderation module, editors are unable to order children if the node is in draft revision.

Steps to reproduce

1. Install standard profile
2. Install entity_hierarchy and content_moderation
3. Enable the default workflow for the basic page
4. Add a parent field to the basic page
5. Create a few nodes in hierarchy, all published
6. Check the /node/TOPNID/children - looks ok.
7. Create a new version of top page in draft
8. Check the /node/TOPNID/children - unable to order the children (there are none shown).
9. Publish the top page
10. Check the /node/TOPNID/children - looks ok again.

Proposed resolution

I'm still getting my head around how EH works with revisions (eg the moveChildren() method that is called on entity update). I guess there is a case for being able to order the children of the current published version OR the latest draft version. In any case, having no children showing creates a lot of uncertainty for editors.

Remaining tasks

User interface changes

API changes

Data model changes