-** undo-tree
-#+BEGIN_SRC emacs-lisp :tangle yes :results silent
- (use-package undo-tree
- :ensure t
- :config
- (define-key undo-tree-visualizer-mode-map "j" 'undo-tree-visualize-redo)
- (define-key undo-tree-visualizer-mode-map "k" 'undo-tree-visualize-undo)
- (define-key undo-tree-visualizer-mode-map "h" 'undo-tree-visualize-switch-branch-left)
- (define-key undo-tree-visualizer-mode-map "l" 'undo-tree-visualize-switch-branch-right)
- (global-undo-tree-mode 1))
-#+END_SRC
-