Add vim-style-visual-feedback variable and documentation

doc/DOCUMENTATION.org

@@ -737,6 +737,10 @@ Three styles are available:
 - Emacs,
 - Hybrid (a mix between Vim and Emacs).
 
+To set the editing style set the variable =dotspacemacs-editing-style= to
+either =vim=, =hybrid=, or =emacs=. It possible to pass a list of variables
+as well with the keyword =:variables=, just like for layer variables.
+
 *** Vim
 Spacemacs behaves like in Vim using the [[https://github.com/emacs-evil/evil/][Evil]] mode package to emulate Vim key
 bindings. This is the default style of Spacemacs; it can be set explicitly by
@@ -748,6 +752,21 @@ To bind keys in Vim editing style (=insert state=):
 (define-key evil-insert-state-map (kbd "C-]") 'forward-char)
 #+END_SRC
 
+When setting the Vim style you can pass any variable supported by =evil-mode=
+with the keyword =:variables=. Spacemacs also supports the followgin editing
+style variables for Vim:
+
+| Variable                    | Description                                 |
+|-----------------------------+---------------------------------------------|
+| =vim-style-visual-feedback= | If non-nil then brief highlights on objects |
+
+Default configuration is:
+
+#+BEGIN_SRC emacs-lisp
+(setq-default dotspacemacs-editing-style '(vim :variables
+                                                  vim-style-visual-feedback t)
+#+END_SRC
+
 *** Emacs
 Spacemacs behaves like in raw Emacs using the Holy mode which configures Evil to
 make the =emacs state= the default state everywhere.

layers/+spacemacs/spacemacs-evil/config.el

@@ -10,5 +10,8 @@
 ;;; License: GPLv3
 
 
+(defvar vim-style-visual-feedback t
+  "If non-nil objects are briefly highlighted performing an action.")
+
 (defvar evil-lisp-safe-structural-editing-modes '()
   "A list of major mode symbols where safe structural editing is supported.")

layers/+spacemacs/spacemacs-evil/packages.el

@@ -115,9 +115,11 @@
       ;; disable pulses as it is more distracting than useful and
       ;; less readable.
       (setq evil-goggles-pulse nil
-            evil-goggles-async-duration 0.2
+            evil-goggles-async-duration 0.1
-            evil-goggles-blocking-duration 0.12)
+            evil-goggles-blocking-duration 0.05)
-      (evil-goggles-mode))
+      (if vim-style-visual-feedback
+          (evil-goggles-mode)
+        (evil-googles-mode -1)))
     :config
     (spacemacs|hide-lighter evil-goggles-mode)))