Per-row vertical spacing in GtkTreeView

[Avi <avi w levy gmail com>]

How does one obtain fine-grained control over the vertical spacing 
between rows in a GtkTreeViewColumn?

Obviously, there is the vertical-separator style property for the easy 
case, when all rows should have the same vertical spacing.

But I am unsure how to handle the case of per-row vertical spacing.

Currently, I have a workaround that involves using a combination of 
custom CellRenderers and CellDataFunctions in order to get the styling 
I am going for.

So is there an easier way to go about doing this?