I posted a question on codereview.stackexchange.com, then deleted it immediately and clicked on the "edit" link to edit my question. After pressing the "save edits" button, I faced the "404 page not found" error. Then I tried to post the question again in a new post, but I got this error:
Sorry, this is a duplicate of "Checking if a map is subset of another map"
This is the URL of question I asked and deleted: http://codereview.stackexchange.com/questions/17587/checking-if-a-map-is-subset-of-another-map
So I think this should be a bug. If the question already exists, why couldn't I edit it? And if it does not exist, why can I not post it again?