I had not given it much thought to be honest, presumably in that case you would use the rows/columns inserted or removed signals. I was actually trying to respond to the
On the importance: currently, Qt framework doesn't allow any direct mapping between one table and a hierarchical structure. That's unfortunate, at least because both structures are isomorphic. Here a practical example .........
comment. I think it is a bit unfair to expect QT to provide a mapping between a 2D table and a 3D tree framework, infact it is impossible without some extra information relating to the structure of the tree.

I note that you are no longer a guru, congratulations on your enlightenment Wysota!