Note for users ============== The active_layer option used for the filebrowser operators is now called active_collection. If there is no collections in the scenelayer or if this option is not selected we automatically create a new collection for the new objects. This is the same behaviour of trying to add a new object when there is no collection. Note for developers =================== For those cases I moved the object user count handling from readfile to the scene collection system. It's working fine for those, but we still need to re-visit this for Add objects, and Duplicate - In those cases the usercount is 2 when it should be 1. Reviewers: mont29, sergey Differential Revision: https://developer.blender.org/D2686