org-set-tags function will overwrite original tags when use it pragmatically

[stardiviner <numbchild@gmail.com>]

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I use function ~org-set-tags~ pragmatically like this:

#+begin_src emacs-lisp
(defun my/org-add-note--auto-add-tag ()
  "Auto add tag 'NOTE' when add note log."
  (org-back-to-heading)
  (org-set-tags '("LOG")))
(advice-add 'org-add-note :after #'my/org-add-note--auto-add-tag)
#+end_src

But I found a problem, it will overwrite original tags. It's not appending method.

I hope this function can be improve to suitable for this purpose. What about and
optional argument of this function to decide overwrite or append method?

Thanks in advance.

- -- 
[ stardiviner ]
       I try to make every word tell the meaning what I want to express.

       Blog: https://stardiviner.github.io/
       IRC(freenode): stardiviner, Matrix: stardiviner
       GPG: F09F650D7D674819892591401B5DF1C95AE89AC3
      
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