Fix "lst:setup-rainbow-mode" again

README.org

@@ -5296,38 +5296,6 @@ ruff "$@" | cat
 # End:
 #+end_src
 
-*** Org Babel Ackermann Python test
-:PROPERTIES:
-:CUSTOM_ID: sec:obap-test
-:END:
-
-#+caption[Org Babel Ackermann Python test]:
-#+caption: Org Babel Ackermann Python test.
-#+name: lst:obap-test
-#+header: :wrap "src text -n"
-#+begin_src python -n :eval never-export :exports both :session Python
-# https://rosettacode.org/wiki/Ackermann_function#Python
-# https://www.youtube.com/watch?v=i7sm9dzFtEI
-
-def ack(M, N):
-    if M == 0:
-        return N + 1
-    elif N == 0:
-        return ack(M - 1, 1)
-    else:
-        return ack(M - 1, ack(M, N - 1))
-
-ack(3, 3)
-#+end_src
-
-#+caption[Org Babel Ackermann Python test result]:
-#+caption: Org Babel Ackermann Python test result.
-#+name: lst:obap-test-result
-#+RESULTS: lst:obap-test
-#+begin_src text -n
-61
-#+end_src
-
 *** [[https://pip.pypa.io/en/stable/][Package Installer for Python]]
 :PROPERTIES:
 :CUSTOM_ID: sec:pip-python
@@ -5689,8 +5657,7 @@ setup and requires no configuration.
 #+caption: Configure =ws-butler=.
 #+name: lst:configure-ws-butler
 #+begin_src emacs-lisp -n :results silent
-(when (and (ensure-package-installation 'ws-butler)
-           (fboundp 'ws-butler-mode))
+(when (ensure-package-installation 'ws-butler)
   (setopt ws-butler-keep-whitespace-before-point nil)
   (add-hook 'prog-mode-hook #'ws-butler-mode)
   (add-hook 'text-mode-hook #'ws-butler-mode))
@@ -5951,7 +5918,8 @@ and names in buffers for debugging.
   (setopt rainbow-x-colors-major-mode-list
           (list 'c++-mode 'c-mode 'emacs-lisp-mode 'inferior-emacs-lisp-mode
                 'lisp-interaction-mode 'org-mode 'python-mode))
-  (dolist (symbol '(emacs-lisp-mode-hook python-mode-hook))
+  ;; GAV: How to disable `rainbow-mode' on `emacs-lisp-mode-hook'?
+  (dolist (symbol '(python-mode-hook))
     (add-hook symbol #'rainbow-mode)))
 #+end_src