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AdámCC0 1.0 or later
Sometimes, I regret pushing the "answer" button, and rather want to go back to the question. Since the original question is shown on the left, its title could conveniently be a link back to it.
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CC BY-SA 4.0samcarter
How about an explicit "cancel" button (for writing questions, answers and edits)? It could be located besides the `post answer/question` or `update post` button. 
@samcarter That'd work too.