Feature Request: add source world to SceneSystem streaming worlds

[atomic maple]

I want to process subscenes after they are loaded, based of original world that loads them: specifically I want to read it's flags.
But due to system running in custom world - doesn't seem like there's any link to original world from it.
Simply adding a singleton which has reference to original world will solve this issue.

[spark willow]

If you are instancing subscene from script you can use PostLoadCommandBuffer to do that on your own
https://docs.unity3d.com/Packages/com.unity.entities@1.0/manual/streaming-scene-instancing.html - check "Scene instancing overview" section

[atomic maple]

Yes, but that means I have to modify all systems responsible for loading subscenes... Just for niche feature, meanwhile it would take 5 lines of code to just add the same to scene system