What is the relationship between a model, a tableview and the vertical
headers? Because, as far as I have seen, WTableView has no support for
vertical header.

Are the vertical header use at all, in any view? If I specify data for the
vertical header on the model with `setHeaderData`, are they completely
ignored by WTableView? Or are they used as first column?

I think the only supported way of dealing with a vertical header is:

   *) Forget completely it is a vertical header.
   *) Add an extra first column, as if it were just a normal table column.
   *) Don't use at all the setHeaderData with vertical orientation.
   *) Specify, in the WTableView, that you are using only one column as
vertical header. The only effect will be the first column is fixed from a
"scrolling" point of view, but used as a normal column for the rest of the
operations.

In short, are my assumptions correct about the vertical header of the model
are no-ops for WTableView?

The documentation has null references about this apparent contradiction
(for example, there's no WItemDelegate for the vertical header and I have
no idea about what will happen with objects saved as vertical header).
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