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