magit-revert-rev-file-buffer: Run major-mode hooks again

This reverts [1: f331092], which disabled it for the benefit of
`lsp', which does something that isn't compatible with what we are
doing here.

At least for the time being, advice the `lsp' function instead,
which I have been told, also works around the incompatibility.

Fixes magit#4986.
Re magit#4683.
Re doomemacs/doomemacs#6309.

1: 2022-05-08 f331092
   magit-revert-rev-file-buffer: Use delay-mode-hook

lisp/magit-files.el

@@ -179,12 +179,19 @@ then only after asking.  A non-nil value for REVERT is ignored if REV is
           (after-change-major-mode-hook
            (remq 'global-diff-hl-mode-enable-in-buffers
                  after-change-major-mode-hook)))
-      (delay-mode-hooks
-        (normal-mode t)))
+      (normal-mode t))
     (setq buffer-read-only t)
     (set-buffer-modified-p nil)
     (goto-char (point-min))))
 
+(defun magit--lsp--disable-when-visiting-blob (fn &rest args)
+  "Do nothing when visiting blob using `magit-find-file' and similar.
+See also https://github.com/doomemacs/doomemacs/pull/6309."
+  (unless magit-buffer-revision
+    (apply fn args)))
+
+(advice-add 'lsp :around #'magit--lsp--disable-when-visiting-blob)
+
 ;;; Find Index
 
 (defvar magit-find-index-hook nil)