889b142924
Instead of locking for the whole time the undo data is being stored, only lock while the step's per-node undo node map is being accessed. This is fine because each PBVH node is only processed by a single thread. Changing the node vector to not store anything until the undo step is finalized makes this process a bit simpler because we don't have to build both the map and the vector at the same time. Overall this improved the performance of the sculpt brush benchmark from #118145 by 12%, from 0.68s to 0.61s.
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