GtkTreeView cursor focus

[Stefan Kost <ensonic hora-obscura de>]

hi,

I am looking at the treeview source to find out how the cell-cursor 
focus is handled.
In a treeview I have selection mode is none. Cells are not editable.

When I focus the treeview and then press cursor up/down, the current 
line gets a thin rectangle draw around.

IMHO this is not correct, only the cell that has the focus, should be 
surrounded by the rectangle.

I would like to understand better whats going on. I suppose the focus 
has to do something with gtk-widget states.
Which state is used for the focus - GTK_STATE_ACTIVE or GTK_STATE_PRELIGHT ?
GTK_STATE_SELECTED is obviously for selections.

Many thanks

Stefan