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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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