bug#47969: 28.0.50; Losing minibuffer focus in trying M-x command

[Robert Marshall]

I've been finding - in last 12 months - that sometimes when I do M-x
and type something the cursor has moved to the main window in that
frame, and the desired command ends up in that window if it is a
'normal' buffer or does more drastic things if (for example) in dired.

from Ch l in one of these cases
 <escape> <select-window> x              ;; execute-extended-command
 ;; handle-select-window
 g                                       ;; revert-buffer
 n                                       ;; dired-next-line
 u                                       ;; dired-unmark
 s                                       ;; dired-sort-toggle-or-edit

you'll see that my intention of typing M-x gnus has been subverted and
the commands are happening in a dired buffer!

I have (setq mouse-autoselect-window 1) but I don't think I'm pausing
long enough (and it doesn't see to kick in anyway from a minibuffer)
that handle-select-window is clearly the problem but not sure where it
is coming from, and it is happening very rarely so I'd prefer not to
set a break there.

(plasma desktop environment - in case that's relevant)

Robert

In GNU Emacs 28.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.24.23, cairo 
version 1.16.0)
 of 2021-04-15 built on poulenc
Repository revision: 3b84f8f47c1e2ad2842e3f5ce38823d3083ad12a
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12009000
System Description: Ubuntu 20.10

Configured using:
 'configure --with-xpm=ifavailable'

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

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

Major mode: Help

Minor modes in effect:
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  shell-dirtrack-mode: t
  global-hi-lock-mode: t
  hi-lock-mode: t
  desktop-save-mode: t
  recentf-mode: t
  show-paren-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/robert/elisp/dired-async hides 
/home/robert/.emacs.d/elpa/async-20191030.2138/dired-async
/home/robert/elisp/async hides 
/home/robert/.emacs.d/elpa/async-20191030.2138/async

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Memory information:
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 (vectors 16 292703)
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