• List identifies rows by ariaAttributes (specifically aria-posinset) so that additional children (e.g. sticky rows or overlays) aren't measured as rows, and rows that render nothing don't shift the indices of the rows after them. Rows that don't spread ariaAttributes, or that override aria-posinset or aria-setsize, are still matched by their position. If only some rows spread ariaAttributes (e.g. loaded rows but not loading placeholders), the rows that don't are not measured; spread ariaAttributes onto every row (or none). - #930, #931