last visible word in a Gtk2::TextView

[James Muir <hemlock vtlink net>]

Hi All,

How do I determine the last visible word in a Gtk2::TextView ? I think I 
can get to the last visible line as follows:

my $rect = $textview->get_visible_rect();

my $iter = $textview->get_line_at_y($rect->y + $rect->height);

but I'm not sure how to get to the last word on  the line. Also, what is 
the 'line_top' returned by get_line_at_y  ?

-James