Except for EditMesh transform (which is SNAP_GEOM_EDIT), the snapping
in Cursor transform and in Tools is done to the final geometry
(SNAP_GEOM_FINAL).

However, for deform modifiers, snapping is not done to either the final
geometry or the cage. It is always done for the undeformed BMesh.

This happens because in these cases the coordinates that should be used
are in Mesh->runtime.edit_data->vertexCos.

This patch proposes to use coordinates in vertexCos when available.

Before	After