b2c2d7b7f1
The idea is to push both base mesh geometry and PBVH coordinates so it is possible to undo everything without loosing data which was not flushed from sculpt session to base mesh. It is possible do memory optimization to avoid push custom data layers which are not touched by operator, but before doing that better to ensure this is a correct and working approach. Differential Revision: https://developer.blender.org/D7381