Revert "[spacemacs-bootstrap] Remove whitespace from kill ring. (#15634)"

This reverts commit 91af298090.

it breaks (kill-whole-line) `kill-whole-line` (C-S <backspace>)

the SO link mentioned in it got 0 point.
and hack like this can be put it to user's own config.

CHANGELOG.develop

@@ -100,8 +100,6 @@ the [[file:CHANGELOG.org][CHANGELOG.org]] file.
 - The property =:powerline-scale= of variable =dotspacemacs-default-font= has
   been removed and replaced by the property =:separator-scale= used in the new
   dotfile variable =dotspacemacs-mode-line-theme=.
-- If =dotspacemacs-enable-paste-transient-state= is enabled, whitespace is
-  removed from the kill ring for better ergonomics. (thanks to BenedictHW)
 **** Layers
 ***** Spacemacs distribution layers
 - Key bindings:

core/templates/.spacemacs.template

@@ -324,7 +324,7 @@ It should only modify the values of Spacemacs settings."
 
    ;; If non-nil, the paste transient-state is enabled. While enabled, after you
    ;; paste something, pressing `C-j' and `C-k' several times cycles through the
-   ;; non-whitespace elements in the `kill-ring'. (default nil)
+   ;; elements in the `kill-ring'. (default nil)
    dotspacemacs-enable-paste-transient-state nil
 
    ;; Which-key delay in seconds. The which-key buffer is the popup listing

layers/+distributions/spacemacs-bootstrap/packages.el

@@ -242,17 +242,7 @@
     (define-key evil-normal-state-map
       "p" 'spacemacs/paste-transient-state/evil-paste-after)
     (define-key evil-normal-state-map
-      "P" 'spacemacs/paste-transient-state/evil-paste-before)
-    ;; Based on https://stackoverflow.com/questions/12102554/emacs-skip-whitespace-kills
-    (define-advice kill-new (:around (orig-fn string &optional rest) ignore-whitespaces)
-      "Don't put whitespaces into kill ring."
-      (let* ((string-raw (substring-no-properties string))
-             (space-p (not (string-match-p "[^ \t\n\r]" string-raw))))
-        (if (not space-p)
-            (apply orig-fn string rest)
-          (message "skipped whitespace kill")
-          nil))))
-
+      "P" 'spacemacs/paste-transient-state/evil-paste-before))
   ;; fold transient state
   (when (eq 'evil dotspacemacs-folding-method)
     (spacemacs|define-transient-state fold