Function findLastContentRow

docs/external/js/react-dom.development.js:18066–18088

(firstChild)

  }

  function findLastContentRow(firstChild) {
    // This is going to find the last row among these children that is already
    // showing content on the screen, as opposed to being in fallback state or
    // new. If a row has multiple Suspense boundaries, any of them being in the
    // fallback state, counts as the whole row being in a fallback state.
    // Note that the "rows" will be workInProgress, but any nested children
    // will still be current since we haven't rendered them yet. The mounted
    // order may not be the same as the new order. We use the new order.
    var row = firstChild;
    var lastContentRow = null;

    while (row !== null) {
      var currentRow = row.alternate; // New rows can't be content rows.

      if (currentRow !== null && findFirstSuspended(currentRow) === null) {
        lastContentRow = row;
      }

      row = row.sibling;
    }

    return lastContentRow;
  }

  function validateRevealOrder(revealOrder) {
    {