Make X windows container-less

; This is an attempt to make (managed) X windows container-less, i.e. direct children of the root window.  This is mainly to make EXWM compatible with third-party compositors.  Other issues like wrong absolute position should also get resolved by the way.  The workspace containers ("virtual roots") are also removed.  However Emacs frames are still wrapped in containers to avoid unexpected stack reordering.

* exwm-cm.el: Make this module obsolete as EXWM supports third-party compositors now.

* exwm-core.el (exwm--container):
* exwm-floating.el (exwm-floating--set-floating)
(exwm-floating--unset-floating, exwm-floating-hide)
(exwm-floating--start-moveresize, exwm-floating--stop-moveresize)
(exwm-floating--do-moveresize, exwm-floating-move):
* exwm-input.el (exwm-input--update-focus):
* exwm-layout.el (exwm-layout--show, exwm-layout--hide)
(exwm-layout-set-fullscreen, exwm-layout-unset-fullscreen):
* exwm-manage.el (exwm-manage--manage-window, exwm-manage--unmanage-window)
(exwm-manage--kill-buffer-query-function, exwm-manage--kill-client):
* exwm-workspace.el (exwm-workspace--set-fullscreen, exwm-workspace-switch)
(exwm-workspace-move-window, exwm-workspace--add-frame-as-workspace)
(exwm-workspace--remove-frame-as-workspace): Make adaptions for container-less X windows.

* exwm-workspace.el (exwm-workspace--update-ewmh-props):
* exwm.el (exwm--init-icccm-ewmh, exwm--exit-icccm-ewmh): No longer use virtual roots.

* exwm-input.el (exwm-input--on-workspace-list-change)
(exwm-input--update-global-prefix-keys, exwm-input--init, exwm-input--exit): From now on global key bindings are grabbed on the root window so it's no long required to re-grab them each time the workspace list changes.  As a result `exwm-input--on-workspace-list-change' and its corresponding references are discarded.  It remains to be seen if this change will raise input focus issues.

* exwm-manage.el (exwm-manage--manage-window): Explicitly set the workspace for newly managed X windows.
* exwm-floating.el (exwm-floating--set-floating): Avoid implicit reference to the current workspace.

* exwm-core.el (exwm--set-geometry): New function for setting the geometry of an X window.
* exwm-layout.el (exwm-layout--resize-container): Replaced by `exwm-layout--resize-container'.

* exwm-core.el (exwm--guide-window): New global variable recording the guide X window.
* exwm.el (exwm--init-icccm-ewmh): Set it.

* exwm-input.el (exwm-input--post-init): New function containing staffs for initialization but should better get called after the event loop starts.
* exwm.el (exwm-init): Use it.

1 files changed, 5 insertions, 5 deletions

diff --git a/exwm.el b/exwm.el
index 3c0124672b49..02e9152ed0e6 100644
--- a/exwm.el
+++ b/exwm.el
@@ -36,7 +36,6 @@
 ;; + Dynamic workspace support
 ;; + ICCCM/EWMH compliance
 ;; + (Optional) RandR (multi-monitor) support
-;; + (Optional) Built-in compositing manager
 ;; + (Optional) Built-in system tray
 
 ;; Installation & configuration
@@ -509,7 +508,7 @@
                             xcb:Atom:_NET_ACTIVE_WINDOW
                             ;; xcb:Atom:_NET_WORKAREA
                             xcb:Atom:_NET_SUPPORTING_WM_CHECK
-                            xcb:Atom:_NET_VIRTUAL_ROOTS
+                            ;; xcb:Atom:_NET_VIRTUAL_ROOTS
                             ;; xcb:Atom:_NET_DESKTOP_LAYOUT
                             ;; xcb:Atom:_NET_SHOWING_DESKTOP
 
@@ -593,13 +592,14 @@
                             xcb:Atom:_NET_WM_FULL_PLACEMENT)))
   ;; Create a child window for setting _NET_SUPPORTING_WM_CHECK
   (let ((new-id (xcb:generate-id exwm--connection)))
+    (setq exwm--guide-window new-id)
     (xcb:+request exwm--connection
         (make-instance 'xcb:CreateWindow
                        :depth 0
                        :wid new-id
                        :parent exwm--root
-                       :x 0
-                       :y 0
+                       :x -1
+                       :y -1
                        :width 1
                        :height 1
                        :border-width 0
@@ -636,7 +636,6 @@
               xcb:Atom:_NET_CURRENT_DESKTOP
               xcb:Atom:_NET_ACTIVE_WINDOW
               xcb:Atom:_NET_SUPPORTING_WM_CHECK
-              xcb:Atom:_NET_VIRTUAL_ROOTS
               ;; TODO: Keep this list synchronized with that in
               ;;       `exwm--init-icccm-ewmh'.
               ))
@@ -688,6 +687,7 @@
         (exwm-input--init)
         (exwm--unlock)
         (exwm-workspace--post-init)
+        (exwm-input--post-init)
         ;; Manage existing windows
         (exwm-manage--scan)
         (run-hooks 'exwm-init-hook)))))