subtree(3p/exwm): update & hard reset to commit 'a6e66f5e33'

This contains a bunch of upstream changes after the new maintainers of
EXWM took over, including proper mainlined versions of patches I've
been carrying around here manually.

Notably this undoes the Chromium focus fix patch, lets see how that goes.

git-subtree-dir: third_party/exwm
git-subtree-mainline: a756b46bc70a8a1dbb205d50283a3fe65282ed91
git-subtree-split: a6e66f5e33
Change-Id: Ibcaba379b56611b8f1918c3b60469492d64a3eb7

third_party/exwm/exwm.el

@@ -1,13 +1,13 @@
 ;;; exwm.el --- Emacs X Window Manager  -*- lexical-binding: t -*-
 
-;; Copyright (C) 2015-2023 Free Software Foundation, Inc.
+;; Copyright (C) 2015-2024 Free Software Foundation, Inc.
 
 ;; Author: Chris Feng <chris.w.feng@gmail.com>
-;; Maintainer: Adrián Medraño Calvo <adrian@medranocalvo.com>
+;; Maintainer: Adrián Medraño Calvo <adrian@medranocalvo.com>, Steven Allen <steven@stebalien.com>, Daniel Mendler <mail@daniel-mendler.de>
 ;; Version: 0.28
-;; Package-Requires: ((xelb "0.18"))
+;; Package-Requires: ((emacs "27.1") (xelb "0.18"))
 ;; Keywords: unix
-;; URL: https://github.com/ch11ng/exwm
+;; URL: https://github.com/emacs-exwm/exwm
 
 ;; This file is part of GNU Emacs.
 
@@ -29,14 +29,18 @@
 ;; Overview
 ;; --------
 ;; EXWM (Emacs X Window Manager) is a full-featured tiling X window manager
-;; for Emacs built on top of [XELB](https://github.com/ch11ng/xelb).
+;; for Emacs built on top of [XELB](https://github.com/emacs-exwm/xelb).
 ;; It features:
 ;; + Fully keyboard-driven operations
 ;; + Hybrid layout modes (tiling & stacking)
 ;; + Dynamic workspace support
 ;; + ICCCM/EWMH compliance
-;; + (Optional) RandR (multi-monitor) support
-;; + (Optional) Built-in system tray
+;; Optional features:
+;; + RandR (multi-monitor) support
+;; + System tray
+;; + Input method
+;; + Background setting support
+;; + XSETTINGS server
 
 ;; Installation & configuration
 ;; ----------------------------
@@ -54,7 +58,7 @@
 ;;    xinit -- vt01
 ;;
 ;; You should additionally hide the menu-bar, tool-bar, etc to increase the
-;; usable space.  Please check the wiki (https://github.com/ch11ng/exwm/wiki)
+;; usable space.  Please check the wiki (https://github.com/emacs-exwm/exwm/wiki)
 ;; for more detailed instructions on installation, configuration, usage, etc.
 
 ;; References:
@@ -77,7 +81,6 @@
 (defgroup exwm nil
   "Emacs X Window Manager."
   :tag "EXWM"
-  :version "25.3"
   :group 'applications
   :prefix "exwm-")
 
@@ -97,7 +100,10 @@
   "Normal hook run when window title is updated."
   :type 'hook)
 
-(defcustom exwm-blocking-subrs '(x-file-dialog x-popup-dialog x-select-font)
+(defcustom exwm-blocking-subrs
+  ;; `x-file-dialog' and `x-select-font' are missing on some Emacs builds, for
+  ;; example on the X11 Lucid build.
+  '(x-file-dialog x-popup-dialog x-select-font message-box message-or-box)
   "Subrs (primitives) that would normally block EXWM."
   :type '(repeat function))
 
@@ -110,6 +116,10 @@
 (defconst exwm--server-name "server-exwm"
   "Name of the subordinate Emacs server.")
 
+(defvar exwm--server-timeout 1
+  "Number of seconds to wait for the subordinate Emacs server to exit.
+After this time, the server will be killed.")
+
 (defvar exwm--server-process nil "Process of the subordinate Emacs server.")
 
 (defun exwm-reset ()
@@ -166,7 +176,7 @@ Argument XWIN contains the X window of the `exwm-mode' buffer."
       (when reply
         (setq desktop (slot-value reply 'value))
         (cond
-         ((eq desktop 4294967295.)
+         ((and desktop (= desktop 4294967295.))
           (unless (or (not exwm--floating-frame)
                       (eq exwm--frame exwm-workspace--current)
                       (and exwm--desktop
@@ -482,9 +492,6 @@ RAW-DATA contains unmarshalled ClientMessage event data."
       (exwm-workspace-switch (elt data 0)))
      ;; _NET_ACTIVE_WINDOW.
      ((= type xcb:Atom:_NET_ACTIVE_WINDOW)
-      (dolist (f exwm-workspace--list)
-        (when (eq id (frame-parameter f 'exwm-outer-id))
-          (x-focus-frame f t)))
       (let ((buffer (exwm--id->buffer id))
             iconic window)
         (if (buffer-live-p buffer)
@@ -1002,8 +1009,13 @@ FRAME, if given, indicates the X display EXWM should manage."
 (defun exwm--server-stop ()
   "Stop the subordinate Emacs server."
   (exwm--log)
-  (server-force-delete exwm--server-name)
   (when exwm--server-process
+    (when (process-live-p exwm--server-process)
+      (cl-loop
+       initially (signal-process exwm--server-process 'TERM)
+       while     (process-live-p exwm--server-process)
+       repeat    (* 10 exwm--server-timeout)
+       do        (sit-for 0.1)))
     (delete-process exwm--server-process)
     (setq exwm--server-process nil)))
 
@@ -1020,7 +1032,7 @@ FUNCTION is the function to be evaluated, ARGS are the arguments."
                          (car command-line-args) ;The executable file
                          "-d" (frame-parameter nil 'display)
                          "-Q"
-                         (concat "--daemon=" exwm--server-name)
+                         (concat "--fg-daemon=" exwm--server-name)
                          "--eval"
                          ;; Create an invisible frame
                          "(make-frame '((window-system . x) (visibility)))"))