How to keep dir-local variables when switching major modes?

Question

I\'m committing to a project where standard indentations and tabs are 3-chars wide, and it\'s using a mix of HTML, PHP, and JavaScript. Since I use Emacs for everything, and

Answer 1

My take on this:

(add-hook 'after-change-major-mode-hook #'hack-local-variables)

and either

(defun my-normal-mode-advice
    (function &rest ...)
  (let ((after-change-major-mode-hook
         (remq #'hack-local-variables after-change-major-mode-hook)))
    (apply function ...)))

if you can live with the annoying

Making after-change-major-mode-hook buffer-local while locally let-bound!

message or

(defun my-normal-mode-advice
    (function &rest ...)
  (remove-hook 'after-change-major-mode-hook #'hack-local-variables)
  (unwind-protect
      (apply function ...)
    (add-hook 'after-change-major-mode-hook #'hack-local-variables)))

otherwise and finally

(advice-add #'normal-mode :around #'my-normal-mode-advice)