wdired doesn't work on files with backslash in their names

[Chris Moore]

I made a file with a backslash in its name and then tried to rename it
using wdired.  The backslash appeared doubled in the dired buffer.

On renaming, it complains:

  Rename `/tmp/^G' to `/tmp/\aa' failed:
  (file-error Renaming no such file or directory /tmp/^G /tmp/\aa)

Looks like the \a is being interpreted as a control-G?

To repeat:

In a shell:

  touch '\a'

Then in a dired buffer viewing that file's directory:

  M-x wdired-change-to-wdired-mode RET
  <edit the \\a to something else>
  C-c C-c

Chris.