message: not sure we need this, but adding the padding in _offset container
diff: @@ -66,7 +66,7 @@ class RoomDistributor {
  _contentSize(item) {
  const scrollItem = item.domNode.querySelector(".mx_RoomSubList_scroll");
  const headerHeight = item.size() - scrollItem.offsetHeight;
  - return headerHeight + scrollItem.scrollHeight;
  + return headerHeight + scrollItem.scrollHeight + 4;
  }
  resize(size) {
  