Well, going forward is undefined (i.e., redo history loss), unless you implement "linearized" history [1], which anecdotally is very confusing for most people.

Well, going forward is undefined (i.e., redo history loss), unless you implement "linearized" history [1], which anecdotally is very confusing for most people. [1]: https://www.felesatra.moe/blog/2019/08/04/emacs-undo https://www.felesatra.moe/blog/2019/08/04/emacs-undo