bug#26911: 25.2; eshell "cd .." doesn't work correctly with TRAMP

[Mattias Engdegård]

No doubt the change (14fb657ba82) is fine in isolation, but now if Emacs is 
started from $HOME/somedir and I do find-file, the minibuffer prompt is 
"/home/mattias/somedir/" instead of "~/somedir/" which does not seem to be an 
improvement.

Worse, if cwd is $HOME, the minibuffer prompt becomes "~" instead of "~/" which 
is inconvenient since that slash has to be typed explicitly.

If nobody else is observing the effect then I'm doing something wrong but I'm 
not sure what.