This question already has an answer here:
I came to a situation, where while I was suggesting an edit, the OP already improved it (better than my version). As this was only 1-2 minutes after the question was posed, OP's edit isn't even listed in the edit history. Am I able to retract my own edit, as it makes no longer sence, and would just look like an degradation?
Should I just write a short comment, explaining the issue?