preserveDataModel does not make selected row available

[Gregory D Dennis]

Can anyone explain why setting the preserveDataModel attribute to true in a
dataTable does not make the selected row (via getRowIndex or getRowData)
available on the subsequent request? That seems to be what one would logically
expect. Currently, preserving the selected row requires saving the state of the
data model's wrapped data. It would be nice if using t:saveState on the wrapped
data and setting the preserveDataModel attribute to true had the same effect.