Change record status: 
Project: 
Introduced in branch: 
8.3.x
Introduced in version: 
8.3.0
Description: 

When calling $entity->setNewRevision(TRUE); the revision id is set to null.

#2809227: Store revision id in originalRevisionId property to use after revision id is updated introduces OriginalRevisionIdInterface and implements it's two methods in ContentEntityBase.

This allows $entity->getOriginalRevisionId(); to be called to get the original revision id, before the entity is saved with a new revision id.

Impacts: 
Module developers