How to get position of Object in Model when using TreeListModel

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When using a ColumnView and TreeListModel wrapped by a SingleSelection, you can get the position of the selected TreeListRow and the row itself using (abbreviated)

single_selection_model.selection();
sel_pos = selection.nth(0);
row = trm.row(sel_pos);

But if this a row at depth zero, Can you get the position of the row item in the original (unexpanded) model?

Basically if I select the 3rd parent where each has 6 children and I select the 2nd parent, the sel_pos above will be 7. How do I work out it is the second parent, without walking the whole model counting children of expanded rows?

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