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Here is an with-undo-collapse macro that uses Emacs-26 change-groups feature. This is atomic-change-group with a one line change, adding undo-amalgamate-change-group. It has the advantages that: It doesn't need to manipulate the undo data directly. It ensures undo data isn't truncated. (defmacro with-undo-collapse (&rest body) "Like `progn' but ...


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There are two (2) likely suspects: I. undo-tree-enable-undo-in-region is at its default non-nil setting and the O.P. has an active region; i.e., there are no more available undos in that active region. In such a case, try: (setq undo-tree-enable-undo-in-region nil) The above-mentioned setting will also avoid the O.P. encountering a different long-...


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Emacs is self-documenting in the sense that public variables functions and macros have documentation strings. You get this string for undo-tree-auto-save-history by typing C-h v undo-tree-auto-save-history RET. Your question And is it going to auto-restore the undo-tree when opening a file ? is answered in the doc-string: When non-nil, `undo-tree-...


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This should be mitigated on the current develop branch because those limits were increased by 10X. When using undo-tree these variables are increased: undo-limit 800000 ;; previously 80000 undo-strong-limit 12000000 ;; previously 120000 undo-outer-limit 120000000 ;; previously 12000000 The change is at: https://github.com/syl20bnr/spacemacs/commit/...


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This is a problem with undo-tree. At the time of this writing there is no workaround nor a fix on the horizon. The last update to the package was August 8, 2013. Apparently no one has a reliable way to even reproduce the problem. To quote a related SE post: The author of undo-tree.el, Toby Cubitt, is presently too busy to fix this particular bug. ...


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Edit, this is now a package which can be used for undo/redo with evil-mode - undo-fu. Adding answer to own question since I've been using evil w/o undo-tree for some time now. This works surprisingly well to undo/redo which wraps emacs undo without anything heavy like undo-tree or redo+. (global-undo-tree-mode -1) (defun simple-redo () (interactive) (...


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