bug#11795: 24.1.50; wdired: C-c C-c loses marks and positions of renamed files

[Drew Adams]

> >> This patch for wdired.el fixes the problem here (GNU Emacs 24.1.1).
> >
> > But shouldn't Wdired respect the user's setting of option
> > `dired-keep-marker-rename'?  IOW, shouldn't users be able to control
> > whether exiting wdired removes marks?
> 
> Right.

Looks OK to me.

A question is whether we should bother to invoke `dired-remember-marks' if
`dired-keep-marker-rename' is nil.

This patch is local to `wdired-finish-edit', which I think is intended to be
more or less atomic (a transaction), so I guess the answer is no (a user cannot
change the option value during `wdired-finish-edit').

Not calling `dired-remember-marks' if `dired-keep-marker-rename' is nil would
save a little time (not important), and I don't think we would lose anything
doing that.  But it's a question.

BTW, I wonder if there isn't some part of `wdired-finish-edit' that should be in
an `unwind-protect'.  Not thinking of anything in particular - just a feeling...