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

[Ivan Shmakov]

>>>>> Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

 >> PS.  Should the pending objections be resolved by sometime around
 >> 18:00 UTC today, I’d happily push the change to ‘master’.

 > Most of the change (tho not the removal of set-buffer-multibyte)
 > probably belongs in emacs-24 rather than in master.

        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.)

 >> +    (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.

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