Gtk scrollbar: thumb too short

[Kai Großjohann]

I understand why the scrollbar thumb is shorter than I think it
should be: to allow for placing the last line of the buffer in the
top line of the window.

But still, I'm not so happy with the current look of the scrollbar.
It confuses me quite a bit.  Is there no way to make the thumb extend
to the bottom of the scrollbar area when end of buffer is visible, and
yet to also allow scrolling further down so that the last line of the
buffer can be moved to the top of the window?
-- 
A preposition is not a good thing to end a sentence with.