After posting an answer I received good comments highlighting an error in my understanding. To correct it would be a major edit, drastically and conceptually changing around half the text of my answer. But when I go to edit it, I am presented with a text box telling me to
► fix grammatical or spelling errors
► clarify meaning without changing it
► correct minor mistakes
► add related resources or links
► always respect the original author.
This doesn't seem to allow the major revision that I want to make. This accepted answer says that "Edits that turn an incorrect answer into a correct one is a drastic change and should not be done by anyone". Does "anyone" include the original author? Should I post a completely new answer instead? In that case, what should I do with the old, partially incorrect answer?
To me it feels the most natural to just edit the old answer and mention the edit in the corrected version. But I want to know for sure whether that is the best practice.