bug#39379: 27.0.60; Fix for #38457 broke ido-vertical-mode

[Jimmy Yuen Ho Wong]

Fix for #38457, commit 3b0938c0420de2b845e7e8f8fbbb57ddc61718f2, seems
to have broken ido-vertical-mode and perhaps other minor modes that uses
similar techniques to render a custom ido completion list. Is there
another fix possible, or better yet, introduce a new overridable
function that controls how the prompt is displayed?

https://github.com/creichert/ido-vertical-mode.el/issues/48


In GNU Emacs 27.0.60 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60 
Version 10.14.6 (Build 18G2022))
 of 2020-01-31 built on MobileCat.local
Repository revision: cdf8c31844263312aaf08527ce251edb32c5819c
Repository branch: HEAD
Windowing system distributor 'Apple', version 10.3.1671
System Description:  Mac OS X 10.14.6

Recent messages:
Can’t guess python-indent-offset, using defaults: 4
Importmagic and/or epc not found. importmagic.el will not be working.
Can’t guess python-indent-offset, using defaults: 4
Importmagic and/or epc not found. importmagic.el will not be working. [6 times]
ls does not support --dired; see ‘dired-use-ls-dired’ for more details.
Wrote /Users/wyuenho/.emacs.d/.emacs.desktop.lock
Desktop: 1 frame, 24 buffers restored.
Turning on magit-auto-revert-mode...done (1.118s, 74 buffers checked)
For information about GNU Emacs and the GNU system, type C-h C-a.
Package cl is deprecated

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