message: Add more statements to avoid layout changes
diff: @@ -699,12 +699,16 @@ export default createReactClass({
  const height = Math.max(minHeight, contentHeight);
  this._pages = Math.ceil(height / PAGE_SIZE);
  this._bottomGrowth = 0;
  - const newHeight = this._getListHeight();
  + const newHeight = `${this._getListHeight()}px`;
  const scrollState = this.scrollState;
  if (scrollState.stuckAtBottom) {
  - itemlist.style.height = `${newHeight}px`;
  + if (itemlist.style.height !== newHeight) {
  + itemlist.style.height = newHeight;
  + }
  + if (sn.scrollTop !== sn.scrollHeight){
  sn.scrollTop = sn.scrollHeight;
  + }
  debuglog("updateHeight to", newHeight);
  } else if (scrollState.trackedScrollToken) {
  const trackedNode = this._getTrackedNode();
  @@ -714,7 +718,9 @@ export default createReactClass({
  // the currently filled piece of the timeline
  if (trackedNode) {
  const oldTop = trackedNode.offsetTop;
  - itemlist.style.height = `${newHeight}px`;
  + if (itemlist.style.height !== newHeight) {
  + itemlist.style.height = newHeight;
  + }
  const newTop = trackedNode.offsetTop;
  const topDiff = newTop - oldTop;
  // important to scroll by a relative amount as
  