be77eeae46
When this works correctly, we should be able to feed in an existing depsgraph instance, and get out a "filtered" copy of it that contains only the subset of nodes needed to evaluate what we're interested in. The current implementation only filters on ID blocks/nodes, and starts by building a full new depsgraph instance first. I'd originally intended to do it per operation instead, copying over individual nodes as appropriate to have the smallest and least memory intensive graph possible. However, I ended up running into into problems with function binding + COW arguments, hence the current slow solution.