message: allow fractional values for scrollTop above and below expected value
diff: @@ -222,10 +222,12 @@ module.exports = React.createClass({
  // whether it will stay that way when the children update.
  isAtBottom: function() {
  const sn = this._getScrollNode();
  - // fractional values for scrollTop happen on certain browsers/platforms
  + // fractional values (both too big and too small)
  + // for scrollTop happen on certain browsers/platforms
  // when scrolled all the way down. E.g. Chrome 72 on debian.
  - // so ceil everything upwards to make sure it aligns.
  - return Math.ceil(sn.scrollTop) === Math.ceil(sn.scrollHeight - sn.clientHeight);
  + // so check difference <= 1;
  + return Math.abs(sn.scrollHeight - (sn.scrollTop + sn.clientHeight)) <= 1;
  +
  },
  // returns the vertical height in the given direction that can be removed from
  