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Emacs has this in paredit. A new tree edit mode is a fun exploration in non lisp sources.

• dan-robertson 5y ago
  Paredit give you multiple ways to achieve one thing. Maybe it is fine for real-time collaborative editing but for a VC-type setup it seems to me that the challenge would be in determining the correct list of operations for a given diff so that the results are unsurprising. Consider how often something simple like standard diffs are wrong (where a new function adds the end to one function and the beginning to the following function as the functions all have a similar ending)
  • taeric 5y ago
    Have you looked at tree edit? I thought it could do this, to an extent. That all said, I am pretty bullish against this idea, at large. For many reasons, not least that I can't remember that many times it makes this mistake. I noticed it when it happens, but it doesn't actually happen that often.