bug#69511: Restore any state after revert-buffer

[Juri Linkov]

>> +  (add-hook 'revert-buffer-state-functions
>> +            (lambda ()
>> +              (when (bound-and-true-p outline-minor-mode)
>> +                (lambda ()
>> +                  (outline-minor-mode-highlight-buffer))))))
>
> Side note: most of the time it's better to avoid to add lambdas to hooks
> for several reasons (non-trivial identity checks; inspection of the
> variable by the user) when possible.

I remember Alan said this in bug#66750.