bug#7087: 24.0.50; cannot customize default-frame-alist - it says value is nil but it is not

[martin rudalics]

> In this Emacs 24 build, M-x customize-option default-frame-alist gives a
> Customize buffer that shows the value of the option as nil and says
> "this option has been changed outside the customize buffer. (mismatch)".
> However, C-h v default-frame-alist shows it has a non-nil value:
>
> ((foreground-color . "Black")
...
>  (icon-type)
>  nil
   ^^^
`default-frame-alist' has the customization type

               (repeat (cons :format "%v"
                             (symbol :tag "Parameter")
                             (sexp :tag "Value"))))

so obviously this "nil" here will cause a mismatch.

>  (left-fringe . 0)
>  (right-fringe . 0)
>  (fringe . 0))
>
> Clearly there is a mismatch, not between the value and what the option
> spec should be, but between what Customize thinks the value is and what
> the value is in fact.  And even if the option value were nil, I don't
> think that would signify a mismatch.  Something is very wrong here.

Indeed.  You just have to find the culprit ;-)

martin