message: also set max-height so you can't make a sublist bigger than the content
diff: @@ -371,8 +371,12 @@ const RoomSubList = React.createClass({
  </div>;
  } else {
  const heightEstimation = (len * 40) + 31;
  + const style = {
  + flexBasis: `${heightEstimation}px`,
  + maxHeight: `${heightEstimation}px`,
  + };
  const GeminiScrollbarWrapper = sdk.getComponent("elements.GeminiScrollbarWrapper");
  - return <div className={"mx_RoomSubList"} style={{flexBasis: heightEstimation}}>
  + return <div className={"mx_RoomSubList"} style={style}>
  {this._getHeaderJsx()}
  <GeminiScrollbarWrapper>
  { content }
  