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

[Florian Berger <fberger florian-berger de>]

Hi,

I want to change the GtkTreeView line height of a Gtk application using
gtkrc.

In a Gtk application, I have this line height:

http://i.stack.imgur.com/imJvi.jpg

and I want that line height:

http://i.stack.imgur.com/nhQwP.jpg

Note that this is the same font size.

Is it possible to achieve this line height / padding using gtkrc, or
is that hard-coded in the application? If it can be changed from the
outside, how?

Any hint will be appreciated.

Best regards,

        Florian