bug#39564: 28.0.50; read-key function do not display the prompt if called from read-from-minibuffer

[Ergus via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

read-key function not display the prompt if called from
read-from-minibuffer

In the current emacs master this issue breaks a package like ivy.

This has been discused in: https://github.com/abo-abo/swiper/issues/2444

As a test code provided by the ivy developer Oleh Krehel:

```
(let ((map (make-sparse-keymap)))
   (define-key map (kbd "C-f") (lambda ()
                                 (interactive)
                                 (message "%S" (read-key "line1\nline2\nline3\nTest2: "))
                                 (minibuffer-keyboard-quit)))
   (read-from-minibuffer "Test1: " nil map))
```


In GNU Emacs 28.0.50 (build 22, x86_64-pc-linux-gnu, GTK+ Version 3.24.13, cairo version 1.17.3)
  of 2020-02-07 built on Ergus
Repository revision: 30abcda54e1b0e15fc10b3db1c2b9f89ca521bfa
Repository branch: master
System Description: Arch Linux

Recent messages:
Loading /home/ergo/.emacs.d/custom.el (source)...done
Source file ‘/home/ergo/.emacs.d/elpa/xclip-1.9/xclip.el’ newer than byte-compiled file; using older file
Starting new Ispell process /usr/bin/aspell with default dictionary...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Load time 0.978641

Configured using:
  'configure --prefix=/mnt/casa/install_arch/emacs --with-mailutils'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD
JSON PDUMPER LCMS2 GMP

Important settings:
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   locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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   projectile-mode: t
   counsel-mode: t
   ivy-mode: t
   which-function-mode: t
   electric-pair-mode: t
   highlight-numbers-mode: t
   flyspell-mode: t
   flymake-mode: t
   global-company-mode: t
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   composable-mark-mode: t
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   which-key-mode: t
   winner-mode: t
   xterm-mouse-mode: t
   xclip-mode: t
   show-paren-mode: t
   override-global-mode: t
   minibuffer-depth-indicate-mode: t
   save-place-mode: t
   delete-selection-mode: t
   savehist-mode: t
   global-display-fill-column-indicator-mode: t
   display-fill-column-indicator-mode: t
   global-display-line-numbers-mode: t
   display-line-numbers-mode: t
   global-auto-revert-mode: t
   tooltip-mode: t
   global-eldoc-mode: t
   eldoc-mode: t
   electric-indent-mode: t
   mouse-wheel-mode: t
   file-name-shadow-mode: t
   global-font-lock-mode: t
   font-lock-mode: t
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t
   size-indication-mode: t
   column-number-mode: t
   line-number-mode: t
   transient-mark-mode: t

Load-path shadows:
/usr/share/emacs/site-lisp/cmake-mode hides /home/ergo/.emacs.d/elpa/cmake-mode-20190710.1319/cmake-mode
~/gits/emacs-counsel-gtags/counsel-gtags hides /home/ergo/.emacs.d/elpa/counsel-gtags-20200101.1701/counsel-gtags
/usr/share/emacs/site-lisp/notmuch-crypto hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-crypto
/usr/share/emacs/site-lisp/notmuch-compat hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-compat
/usr/share/emacs/site-lisp/notmuch-hello hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-hello
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/usr/share/emacs/site-lisp/notmuch-maildir-fcc hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-maildir-fcc
/usr/share/emacs/site-lisp/coolj hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/coolj
/usr/share/emacs/site-lisp/notmuch-draft hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-draft
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/usr/share/emacs/site-lisp/notmuch-parser hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-parser
/usr/share/emacs/site-lisp/notmuch-lib hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-lib
/usr/share/emacs/site-lisp/notmuch-mua hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-mua
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/usr/share/emacs/site-lisp/notmuch-address hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-address
/usr/share/emacs/site-lisp/notmuch-wash hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-wash
/usr/share/emacs/site-lisp/notmuch-tag hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-tag
/usr/share/emacs/site-lisp/notmuch-print hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-print
/usr/share/emacs/site-lisp/notmuch-query hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-query
/usr/share/emacs/site-lisp/notmuch-jump hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-jump
/usr/share/emacs/site-lisp/notmuch-company hides /home/ergo/.emacs.d/elpa/notmuch-20200109.114/notmuch-company

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Memory information:
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