Blender Git Loki

Fix #34813: smooth brush used on a shape key messes up the topology - part2

This reverts rev55642 and fixes issue in a different way.

The thing here is: isolated vertices are for sure not in BVH
and updating keyblock could not only rely on idea that all
vertices are in BVH (no idea why it was noticed just now).

Solved in a way, that uses old keyblock coordinates as new
keyblock, and then refines it using coordinates from BVH.

Hopefully it'll cover all cases now :)