Black on black background? Strange. I have seen that but I cant remember when. Well, it is better at two people than one person .. it has a recent bug where one person typing fast can mess it up, but it does have the code to listen for changes coming downstream, interleaved with the changes going upstream. When someone, say, deletes a character, a PATCH representing the change goes back to the server. If someone else has just deleted the same character, the pach fails because the change can’t be done to the current graph, and the server returns “409 Conflict” HTTP reponse. The original user’s UI gets backed out — the deleted character is restored (and the line gets a pink background as a warning), and the file is reloaded, and the UI is synced with the file in a non-destructive way — in other words the exising fields which may be haev focuss or being edited are not deleted, just cahnges andnnew elements added/deleted to match te new state.