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Increase `undo-limit`, `undo-strong-limit` and `undo-outer-limit` by a factor of ten, which should prevent emacs from prematurely truncating the undo history and corrupting the tree. Restore `undo-tree-auto-save-history` which was disabled to avoid exacerbating the undo history truncation. Change the `undo-tree` recipe to grab the latest version from the maintainer's repostiory instead of the outdated ELPA version. Restore `undo-tree-enable-undo-in-region` which should be fixed in the latest version of `undo-tree`.