bug#10489: 24.0.92; dired-do-copy may create infinite directory hierarchy

[Drew Adams]

> > I believe that is all taken care of by the code I sent, which uses
> > `file-remote-p'.  IOW, I think `file-remote-p' does that.  
> > But I'm no expert on this stuff.
> 
> As I've pointed out, a specialized Tramp function could do better than
> Tramp's version of `file-remote-p', for example knowing that 
> the methods "ssh" and "scp" are equal when it is about `file-name-equal-p'.
> 
> That's why I'm in favor of `file-name-equal-p' AND its file 
> name handler for remote files.

Sounds good to me.