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When editing an answer to this question, I got a notification that whilst editing, it had been edited by someone else.
The notification appeared as I clicked Save so as soon as the page had finished loading, I went to look in the edit history and could only see my own edits.
Either I got a spurious "this answer has been edited" message or someone's edits weren't recorded.
This seems to happen sometimes and I always assumed that it is your own edit that, in the moment of being saved, triggers the "post has been edited" warning.
But it's also completely possible that it is just some race condition, where one edit gets lost. Race conditions aren't avoided in other cases, so they probably also aren't for edits.
