Restore emacs' default undo/redo behavior in spacemacs

[oneself]

I've recently moved to spacemacs and it seems that they've adopted a different undo package (undo-tree) which I don't like since it does not push the undo actions back onto the history stack. I would like to restore the default behavior but I can't seem to figure out how to do this.

C-/ is bound to undo-tree-undo in spacemacs. I've tried to unbind this and use emacs' undo instead, but that does't seem to work. I've added the following in my user-config.el:

(global-unset-key (kbd "C-/"))
(global-set-key (kbd "C-/") 'undo)

But the key remains bound to the undo-tree method. I've also tried bind it to a new key, but the same seems to happen. It's as if spacemacs redirects call to for undo to undo-tree-undo. Is there anyway to fix this? Thank you.

[duianto]

It seems to work to restore the default undo:

 C-/                    ;; undo

By adding:

(global-undo-tree-mode -1)

to the dotspacemacs/user-config section in .spacemacs. .spacemacs can be opened by pressing SPC f e d (or with the Emacs key bindings: M-m f e d)

[bhipple]

I was able to get this working on emacs28 with:

(global-undo-tree-mode -1)
(evil-set-undo-system 'undo-redo)

Without the 2nd, undo wouldn't work. This requires emacs28 off git, since undo-redo is a new built-in, but it already has native support in evil-undo now!

I've only been using this for an hour or two, but so far it seems dramatically faster. I wonder if we should promote this as a first-class choice in spacemacs?

[lebensterben]

@oneself Please try the workaround by @bhipple https://github.com/syl20bnr/spacemacs/issues/14406#issuecomment-851597233

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