Iam totally agree with this suggestion , it has happened to me and it is quite frustrating for me and I think for others .
( How is if there had a Undo-Redo tool in this screen??? I think it will be a good opinion to all of us when typing articles. Sometimes we type something and remove it. But after few seconds we need that removed part. But there has no way to take that removed part again. Because of that, I suggest Undo-Redo tool for the posting tab )