completion-in-region: Overlay issues at BOB

[basil-conto]

I see the following behaviour at the beginning of the buffer on latest master (96663b7):

1. make plain
2. C-xh DEL
3. ivyC-M-i
   • Expected result: overlay with list of completions for "ivy"
   • Actual result: no overlay and buffer contents are erased
4. Inputting f or similar results in
   Error in post-command-hook (ivy--exhibit): (args-out-of-range 5 6)
5. C-g
6. M-:(setq ivy-display-functions-alist ())RET
   • C-M-i works at BOB with minibuffer display function.

[abo-abo]

Thanks. Currently, I don't know if it's possible to make the overlay work at point-min. Minibuffer display will be used in this case.