bug#99: 23.0.60; Dired remote creates local directory through the menus

[Chong Yidong]

> If you open a remote directory in dired and try to create a directory 
> through the menus
>
>   Immediate
>     Create Directory
>
> a local directory will be created. However if you use the key binding 
> (+) it works as expected.

That's strange; the two should do the same thing, because they both run
dired-create-directory.  Could you try to debug this?