Every row in a GtkTreeView seems to have a padding of 3 pixels above and
below the row. This ammounts to 6 pixels space between two lines of text
and this is annoying. Especially for people who use small font sizes and
since there seems to be no way to reduce this space!!

On #gtk+ I got told that this space is needed for the focus rectangle. I
checked and found that the focus rectangle also uses too much space.
Instead of reusing a common pixel-line between two rows, it is completely
contained in one row. (GtkCList for example does reuse a common line).

I agree that it would look more packed if the 3 pixel padding would be
lowered to 1 pixel (for the focus rectangle), but I want it that way, so I
can get more on screen.

IMHO this padding should be configurable from .gtkrc-2.0 using a GtkStyle
property like "vertical-padding".