spacemacs-editing layer

• Support for automatic indentation of code via aggressive-indent.
• Support for jumping to chars using a decision tree via avy.
• Improvements for evaluating sexps via eval-sexp-fu.
• Selecting and editing of multiple text elements via expand-region.
• Support for editing files in hex format via hexl.
• Deletion of consecutive horizontal whitespace with a single key via hungry-delete.
• Support for selecting, copying and opening links using avy via link-hint.
• Adding of sample text via lorem-ipsum.
• Transient state for moving text via move-text.
• Support for folding of code via origami and evil-vimish-fold.
• Support for password generation via password-generator.
• Support for improving parenthesis handling via smartparens.
• Automatic whitespace cleanup on save via spacemacs-whitespace-cleanup.
• Support for converting definitions to certain styles via string-inflection.
• Support for generating UUIDs via uuidgen.
• Support for conversion between Emacs regexps and PCRE regexps.
• Support for persistent scratch via persistent-scratch.
• Support for unkillable scratch via unkillable-scratch.
• Support for sorting (press s) via dired-quick-sort
• Support for evil-easymotion if the editing style is vim or hybrid.
• Support for cycling between multi line block styles via multi-line.
• Support for editing strings inplace via string-edit
• Presents undo history as a tree via undo-tree

In normal state, u is bound to evil-undo which undo changes in the buffer. Emacs's builtin undo command in addition has the ability to undo changes in a selected region. But by default in visual state, u is bound to evil-downcase which downcases the selected text.

You can bound undo to u in visual state, by setting the variable vim-style-enable-undo-region to t in your ~/.spacemacs.

(setq-default dotspacemacs-configuration-layers
              '((spacemacs-editing :variables
                                   vim-style-enable-undo-region t)))