bug#46097: 27.1; Minibuffer may not be current when running minibuffer-exit-hook

[klubujevetru <klubujevetru@cock.li>]

Open the minibuffer with C-x C-f, switch to another window with C-x o
and abort the minibuffer with C-] (abort-recursive-edit).
minibuffer-exit-hook ends up running without the minibuffer being the
current buffer.

This may cause problems if a minibuffer adds a cleanup function the hook
locally, see for example discussion at
https://github.com/oantolin/embark/issues/114
The cleanup function fails to run in this situation because the local
value of the hook isn't considered.


In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.22, cairo version 1.17.3)
 of 2020-08-28 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.12010000
System Description: Arch Linux

Recent messages:
TEST: #<window 8181 on  *Minibuf-3*>  *Minibuf-3*

TEST: #<window 8181 on  *Minibuf-3*>  *Minibuf-3*
TEST: #<window 8181 on  *Minibuf-2*>  *Minibuf-2*
Quit
TEST: #<window 8181 on  *Minibuf-3*>  *Minibuf-3*
Ispell process killed
Local Ispell dictionary set to english
Starting new Ispell process /usr/bin/aspell with english dictionary...done
TEST: #<window 8181 on  *Minibuf-1*>  *Minibuf-1*

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-wide-int
 --with-modules --with-cairo --with-harfbuzz 'CFLAGS=-march=x86-64
 -mtune=generic -O2 -pipe -fno-plt' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

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

Important settings:
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Memory information:
((conses 16 37731258 4232377)
 (symbols 48 94311 3643)
 (strings 32 2626060 933887)
 (string-bytes 1 79259002)
 (vectors 16 624752)
 (vector-slots 8 7835270 2124558)
 (floats 8 19039 20108)
 (intervals 56 5766073 96670)
 (buffers 1000 521))