LDM on the fly conversion asks many time the same subslice data

3039
VolumeViz
9.1
Core

On the fly LDM conversion was reading many times the same slice.

A custom reader had its getSubSlice function called many times with the same slice id and same subslice, sometimes subsequently.  Redundant reads are significantly reduced in 9.1, but note that it is normal for each slice to be read several times.