bug#19865: tar-untar-buffer: should honor default-directory

[Stefan Monnier]

>       I certainly could push it to the stable branch, but as for
>       actually /testing/ it there – that’d double the work for me
>       (as I do not currently follow emacs-24 development.)

OK, your call.

>>> +    (with-current-buffer data-buf
>>> +      (cl-assert (not enable-multibyte-characters)))
>> Why not move this further down where you already do the
>> "(with-current-buffer data-buf"?
>       My only concern is that that latter with-current-buffer happens
>       within a loop, and I don’t seem to see a reason for checking
>       this condition for every archive member extracted.

This assertion should soon be removed altogether anyway, so let's not
waste too much time with it: either way is fine.


        Stefan