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

[Drew Adams]

> > Background: `wdired-finish-edit' calls `revert-buffer', which will
> > call `dired-revert'.  Before this is called, everything is ok.  But
> > `dired-revert' fails to remember the mark and the position of the
> > renamed file correctly.  I didn't dig any further, but I guess a
> > specialized revert function is needed for `wdired-finish-edit'.
> 
> 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?