This was introduced in the first commit of the cloth brush. In order to
support the cloth brush deformations with subsurf modifiers, the sculpt
API was changed to return the deformed coordinates from the PBVH instead
of the mesh coordinates. When using grab active vertex and rendering the
original mesh wireframe it should render the undeformed mesh coordinates
when available.
Reviewed By: sergey
Maniphest Tasks: T79914
Differential Revision: https://developer.blender.org/D8630
1dc11d15a6