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

From: Ergus <[email-masked]>
Date: Tue, 11 Feb 2020 15:49:41 +0100

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:
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Configured features:
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Major mode: Lisp Interaction

Minor modes in effect:
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