### What?
After creating a new document from a relationship field, this doc should
automatically become the selected document for that relationship field.
This is the expected and current behavior. However, when the
relationship ties to a collection with autosave enabled, this does not
happen.
### Why?
This is expected behavior and should still happen when the relationship
is using an autosave enabled collection.
### How?
1. The logic in `addNewRelation` contained an `if` statement that
checked for `operation === 'create'` - however when autosave is enabled,
the `create` operation runs on the first data update and subsequently it
is a `update` operation.
2. The `onSave` from the document drawer provider was not being run as
part of the autosave workflow.
#### Reported by client.
25e3902242
