icomplete-vertical-mode when used in combination with
icomplete-in-buffer set to non nil, does not work well, it only shows
the first selection.

Recepie (Order important for first 2 steps):
1. M-: (setq icomplete-in-buffer t) RET
2. M-x icomplete-vertical-mode RET
3. C-x "*scratch*" RET
4. Go to empty place
5. type: de
6. C-M-i
7. Now you should only see as shown in attached ss