volatile-highlights在不启用dumper时根本就不加载，一直被defer。按照spacemacs/defer的实现下面的:defer (spacemacs/defer 2)应该等价于:defer 2。经过测试不是这回事。如果直接写成:defer 2，volatile-highlights会自动加载。很困惑。大牛们帮忙看看。
(defun spacemacs-editing-visual/init-volatile-highlights ()
(use-package volatile-highlights
:defer (spacemacs/defer 2)
:config
(progn
(require 'volatile-highlights)
- OS: gnu/linux
- Emacs: 27.0.50
- Spacemacs: 0.300.0
- Spacemacs branch: develop (rev. 63924931b)
- Graphic display: t
- Distribution: spacemacs
- Editing style: vim
- Completion: helm