message: Prevent unstable property to be sent with all events
diff: @@ -209,14 +209,26 @@ export default class ReplyThread extends React.Component<IProps, IState> {
  public static makeReplyMixIn(ev: MatrixEvent, replyInThread: boolean) {
  if (!ev) return {};
  - return {
  +
  + const replyMixin = {
  'm.relates_to': {
  'm.in_reply_to': {
  'event_id': ev.getId(),
  - [UNSTABLE_ELEMENT_REPLY_IN_THREAD.name]: replyInThread,
  },
  },
  };
  +
  + /**
  + * @experimental
  + * Rendering hint for threads, only attached if true to make
  + * sure that Element does not start sending that property for all events
  + */
  + if (replyInThread) {
  + const inReplyTo = replyMixin['m.relates_to']['m.in_reply_to'];
  + inReplyTo[UNSTABLE_ELEMENT_REPLY_IN_THREAD.name] = replyInThread;
  + }
  +
  + return replyMixin;
  }
  public static makeThread(
  