code: func (v *TextBuffer) GetIterAtOffset(charOffset int) *TextIter {
  	var iter C.GtkTextIter
  	C.gtk_text_buffer_get_iter_at_offset(v.native(), &iter, C.gint(charOffset))
  	return (*TextIter)(&iter)
  }
docs: // GetIterAtOffset() is a wrapper around gtk_text_buffer_get_iter_at_offset().