How do I change the line height of a GtkTreeView using gtkrc?

In a Gtk application, I have that line height:

and I want this line height:

Note that this i开发者_JAVA百科s the same font size.

Is it possible to achieve this line height / padding using gtkrc? How?

Any hint will be appreciated.

fbmd

Add to gtkrc:

style "tree" {
  GtkTreeView::vertical-separator = 8
}
class "GtkTreeView" style "tree"