bug#32274: (interactive "F") silently expands a directory to the current buffer's path

[Andrea Cardaci]

The value returned by (interactive "F") is not the one provided by the user.

1. Create a file, say /tmp/foo.el:

(defun foo (path)

  (interactive "F")

  (message path))

2. M-x evaluate-buffer

3. M-x foo and chose /tmp/.

The value presented in the echo area is /tmp/foo.el, this is undesirable and very dangerous IMHO. It happens with both Emacs 24 and 26.

Is this a bug or I'm overlooking something?

Andrea