bug#27465: 24.5; `dired-mark-unmarked-files' with non-nil UNFLAG-P

[Lars Ingebrigtsen]

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

> 3. Non-nil UNFLAG-P does nothing, AFAICT.  It _cannot_ do anything.
>    Certainly it cannot unflag, which means change a deletion flag (`D')
>    to a space char.  Why?  Because the replacement is applied only to
>    lines that already have a space char (not a `D').
>
>    Its effect in that case is indeed to post a space char.  But it does
>    so only for lines that already have a space char!
>
>    This is the call:
>
>    (dired-mark-if
>      (and
>       (looking-at-p " ") ; <=== Mark (with a SPC) only if already there!
>       (let ((fn (dired-get-filename localp t)))
>         (and fn (string-match-p regexp fn))))
>      msg)

I've now made unflag-p work on the Emacs trunk.

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