message: Add tooltips to message previews
diff: @@ -563,7 +563,11 @@ export default class RoomTile extends React.PureComponent<IProps, IState> {
  let messagePreview = null;
  if (this.showMessagePreview && this.state.messagePreview) {
  messagePreview = (
  - <div className="mx_RoomTile_messagePreview" id={messagePreviewId(this.props.room.roomId)}>
  + <div
  + className="mx_RoomTile_messagePreview"
  + id={messagePreviewId(this.props.room.roomId)}
  + title={this.state.messagePreview}
  + >
  {this.state.messagePreview}
  </div>
  );
  