chore(3p/exwm): Subtree EXWM ... again

Upstream EXWM is now sort-of unmaintained[0], but some important PRs
are pending[1] which I would like to absorb here somehow.

[0]: https://github.com/ch11ng/exwm/issues/845
[1]: https://github.com/ch11ng/exwm/pull/848

git-subtree-dir: third_party/exwm
git-subtree-mainline: 7894d7e178ac542f2542b71b10cb34e99080acd7
git-subtree-split: 0368127976bda29d35eed788edfe74644ecd3845
Change-Id: I078358c0ea1d2bac99111748ce9c137d2804ac4e

1 files changed, 50 insertions, 0 deletions

diff --git a/third_party/exwm/exwm-cm.el b/third_party/exwm/exwm-cm.el
new file mode 100644
index 000000000000..922847785836
--- /dev/null
+++ b/third_party/exwm/exwm-cm.el
@@ -0,0 +1,50 @@
+;;; exwm-cm.el --- Compositing Manager for EXWM  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2016-2020 Free Software Foundation, Inc.
+
+;; Author: Chris Feng <chris.w.feng@gmail.com>
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This module is obsolete since EXWM now supports third-party compositors.
+
+;;; Code:
+
+(make-obsolete-variable 'exwm-cm-opacity
+                        "This variable should no longer be used." "26")
+
+(defun exwm-cm-set-opacity (&rest _args)
+  (declare (obsolete nil "26")))
+
+(defun exwm-cm-enable ()
+  (declare (obsolete nil "26")))
+
+(defun exwm-cm-start ()
+  (declare (obsolete nil "26")))
+
+(defun exwm-cm-stop ()
+  (declare (obsolete nil "26")))
+
+(defun exwm-cm-toggle ()
+  (declare (obsolete nil "26")))
+
+
+
+(provide 'exwm-cm)
+
+;;; exwm-cm.el ends here