gtk:text-view-line-yrange (view iter)

view -- a gtk:text-view widget
iter -- a gtk:text-iter iterator

y -- an integer with the y coordinate
height -- an integer with the height

Gets the y coordinate of the top of the line containing iter, and the height of the line. The coordinate is a text buffer coordinate. Convert to window coordinates with the gtk:text-view-buffer-to-window-coords function.