bug#13907: 24.3.50; cygw32 build mishandles drag-n-dropped file with non-ASCII characters in name

[Eli Zaretskii]

> Date: Fri, 08 Mar 2013 21:42:56 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 13907@debbugs.gnu.org
> 
> > Date: Fri, 08 Mar 2013 12:18:05 -0500
> > From: Ken Brown <kbrown@cornell.edu>
> > 
> > Create a file "/tmp/Ü.txt".  (In case my mailer mangles this, that's 
> > <U-umlaut>.txt.)  Now open Windows Explorer and drag this file into an 
> > emacs frame.  This results in the error message
> > 
> >    dnd-open-local-file: Can not read file:///tmp/%20.txt
> > 
> > I think the problem occurs early in w32-handle-dropped-file (defined in 
> > lisp/term/w32-win.el).  That function starts with
> > 
> > (let ((f (if (eq system-type 'cygwin)
> >          (cygwin-convert-file-name-from-windows file-name t)
> > 
> > At this point f should have the value "/tmp/Ü.txt".  If I continue 
> > manually carrying out the code in w32-handle-dropped-file as though f 
> > had that value, everything is fine, as shown below.  So 
> > cygwin-convert-file-name-from-windows must be doing something wrong.
> 
> What do you get from cygwin-convert-file-name-from-windows with this
> file name?
> 
> Also, what is the system codepage on this system?

In addition, please describe how you created the "/tmp/Ü.txt" file --
what command did you use?