Gtk.TextView.prototype.get_line_yrange

function get_line_yrange(iter:Gtk.TextIter):void {
    // Gjs wrapper for gtk_text_view_get_line_yrange()
}

Gets the y coordinate of the top of the line containing iter, and the height of the line. The coordinate is a buffer coordinate; convert to window coordinates with Gtk.TextView.prototype.buffer_to_window_coords.