bug#61337: 29.0.60; Setting frame-title-format makes Emacs to steal focus

[Oscar Fuentes]

This is on KDE with two desktops.

Let's suppose that we are on Desktop1. On xterm, for instance:

$ emacs -Q

Eval this on *scratch*:

(setq frame-title-format "hello")

Click somewhere on Emacs' frame to update its displayed title.

Set focus to xterm, switch to Desktop2 and back to Desktop1. Focus is on
Emacs' frame. The z-order is not altered.

After bisecting:

commit e99f41f03a97641ee05ba4a27f8b91c190f55df1
Author: Po Lu <luangruo@yahoo.com>
Date:   Thu Jun 9 21:48:19 2022 +0800

    Fix recalculation of `icon-title-format' after a frame is iconified
    
    Previously it would only happen upon the next mode line
    redisplay, meaning that just pressing C-z would not update the
    implicit title, since C-z doesn't cause a redisplay.
    
    * src/dispextern.h: Update prototypes.
    * src/frame.h (SET_FRAME_ICONIFIED): De-slugify.  Call
    `gui_consider_frame_title', since `icon-title-format' might be
    different from the current frame title.
    * src/xdisp.c (gui_consider_frame_title): Export (also in
    dispextern.h).  (bug#55850)

I checked that reverting this commit fixes the problem.


In GNU Emacs 29.0.60 (build 3, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.16.0) of 2023-02-07 built on sky
Repository revision: 746748f5c283b98a221571e725833affe304a748
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12101006
System Description: Debian GNU/Linux bookworm/sid

Configured using:
 'configure --without-toolkit-scroll-bars --with-x-toolkit=lucid
 --with-modules --without-imagemagick'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND THREADS TIFF TREE_SITTER WEBP X11 XAW3D XDBE XIM XINPUT2
XPM LUCID ZLIB

Important settings:
  value of $LANG: es_ES.UTF-8
  locale-coding-system: utf-8-unix