bug#31558: 27.0; `custom-file' settings messed up by Emacs 27

[Michael Albinus]

Drew Adams <drew.adams@oracle.com> writes:

Hi Drew,

>> > (defcustom tramp-verbose 3
>> >   "..."
>> >   :group 'tramp
>> >   :type 'integer
>> >   :set (lambda (sym val)
>> >          (when (require 'tramp nil t)
>> >            (custom-set-default sym val)))
>> >   :initialize 'custom-initialize-set)
>> 
>> This results in
>> 
>> Loading tramp...
>> Recursive load: "/net/ford/albinus/src/tramp/lisp/tramp.elc",
>> "/net/ford/albinus/src/tramp/lisp/tramp.elc",
>> "/net/ford/albinus/src/tramp/lisp/tramp.elc",
>> "/net/ford/albinus/src/tramp/lisp/tramp.elc",
>> "/net/ford/albinus/src/tramp/lisp/tramp.elc"
>
> Hm, indeed.  Maybe :intialize needs to not try to set it here
> (i.e., during loading).
>
> Maybe :initialize needs to test (featurep 'tramp) or something?
>
> Or maybe some other value of :initialize is appropriate?
> `custom-initialize-default'? 
> `custom-initialize-safe-set'?
> `custom-initialize-safe-default'?
>
> Dunno.  I'm no expert on loading and defcustom initialization.

I will play along those lines:

--8<---------------cut here---------------start------------->8---
  :set (lambda (sym val)
         (eval-after-load 'tramp
           '(custom-set-default sym val)))
  :initialize 'custom-initialize-set)
--8<---------------cut here---------------end--------------->8---

Tomorrow. Tonight, I'm running out of time.

Best regards, Michael.