On SO, I made a comment and realized I'd written 'and' where I meant 'any'. The timer said '4 minutes', but the edit option was still present, so I tried to edit it; it wouldn't let me save it - even though it still said '4 minutes' when I had cancelled it.
Why was the edit option present when it was no longer valid?
And, more particularly, can 'you' (the SO team) do something so that people do not
waste spend time editing a comment when the edit will not be accepted.