A quick check when click 'post' and a pop-up would fix the problem. Should take like 20 minutes to implement. No?

![](https://m.stacker.news/103933)

however, it might just be horrible UX to be working on a post and then suddenly see a red dupe notification. Talk about stress inducing. It may be worth the odd edge case to leave it as is. 

Thing is, two people might be writing the same link and no one gets a heads-up. They could’ve both hit 'start post' at the same time.