bug#19460: 25.0.50; help-function-arglist returns (&rest rest) for adviced functions

[Oleh Krehel]

Hello,

After a minimal config:

    (ido-mode)
    (require 'flx-ido)
    (setq ido-enable-flex-matching t)

`ido-read-internal' becomes advised by `flx'.
So now I get this:

    (help-function-arglist 'ido-read-internal t)
    ;; => (&rest rest)

instead of this:

    (help-function-arglist 'ido-read-internal t)
    ;; => (item prompt hist &optional default require-match initial)

I posted this question on StackOverflow and the answer was to use:

    (help-function-arglist
     (ad-get-orig-definition 'ido-read-internal))

However Stefan suggested in the comments that this could be a bug,
so I'm reporting it here.

regards,
Oleh