Alexander Gavrilov
b97cd0e690
COW nodes in the graph are mostly connected via a relation type that doesn't propagate the update flags. Unfortunately, due to the scheduling implementation that means the relations don't actually guarantee execution order for indirect dependencies. Relations also don't guarantee order in case of cycles. As mentioned in IRC, the simplest way to fix possible problems is to execute all COW nodes as a separate execution stage. This seems to fix crashes with Data Transfer modifier in a cycle. Staging works by simply delaying actual scheduling of tasks for non-COW nodes until the second run of schedule_graph. Reviewers: sergey Differential Revision: https://developer.blender.org/D4027