What happens in the following scenario?
I flag a post because (lets say) it's not an answer.
The OP edits the post and adds some valid data.
I see the edit before a moderator can see and validate/invalidate my flag.
I realize that there is no need for the flag anymore.
(How) can I retract my flag? because I realize there is no need to bother the moderator with this.
(this really happened today).