Only forward sync state messages with a more recent timestamp #259
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When the RemoteHeadsSubscription object receives a remote head event, it checks if the timestamp is older than the remote heads to avoid forwarding old remote heads. The problem is that if the timestamp is equal, it would also forward the remote heads. In standalone TEE, this would lead to an infinite loop of remote heads being forwarded if one document was open in the same browser on multiple tabs. This pull request fixes this so peers only forward the sync state if it's more recent.