message: don't set initial size based on item count anymore
diff: @@ -318,20 +318,17 @@ const RoomSubList = React.createClass({
  if (len) {
  const subListClasses = classNames({
  "mx_RoomSubList": true,
  + "mx_RoomSubList_hidden": this.state.hidden,
  "mx_RoomSubList_nonEmpty": len && !this.state.hidden,
  });
  if (this.state.hidden) {
  - return <div className={subListClasses} style={{flexBasis: "unset", flexGrow: "unset"}}>
  + return <div className={subListClasses}>
  {this._getHeaderJsx()}
  </div>;
  } else {
  - const heightEstimation = (len * 44) + 31 + (8 + 8);
  - const style = {
  - maxHeight: `${heightEstimation}px`,
  - };
  const tiles = this.makeRoomTiles();
  tiles.push(...this.props.extraTiles);
  - return <div style={style} className={subListClasses}>
  + return <div className={subListClasses}>
  {this._getHeaderJsx()}
  <IndicatorScrollbar className="mx_RoomSubList_scroll">
  { tiles }
  