code: func (v *TextView) BufferToWindowCoords(win TextWindowType, buffer_x, buffer_y int) (window_x, window_y int) {
  	var wx, wy C.gint
  	C.gtk_text_view_buffer_to_window_coords(v.native(), C.GtkTextWindowType(win), C.gint(buffer_x), C.gint(buffer_y), &wx, &wy)
  	return int(wx), int(wy)
  }
docs: // BufferToWindowCoords is a wrapper around gtk_text_view_buffer_to_window_coords().