subtree(3p/exwm): update to commit 'b62d5e79'

This is almost one year of changes to EXWM. Note that it undoes our
port of https://github.com/ch11ng/exwm/pull/737

That PR hasn't seen any movement in three years, so it might not be
that relevant anymore. Other stuff has been mainlined in the meantime.

Change-Id: I0845ff8a28a5bb1553855f6d6f0ceeaedcf0809e

third_party/exwm/exwm-input.el

@@ -117,6 +117,9 @@ defined in `exwm-mode-map' here."
 
 (defvar exwm-input--simulation-keys nil "Simulation keys in line-mode.")
 
+(defvar exwm-input--skip-buffer-list-update nil
+  "Skip the upcoming 'buffer-list-update'.")
+
 (defvar exwm-input--temp-line-mode nil
   "Non-nil indicates it's in temporary line-mode for char-mode.")
 
@@ -135,16 +138,8 @@ defined in `exwm-mode-map' here."
   "Timer for deferring the update of input focus.")
 
 (defvar exwm-input--update-focus-window nil "The (Emacs) window to be focused.
-It also helps us discern whether a `buffer-list-update-hook' was caused by a
-different window having been selected.
-
 This value should always be overwritten.")
 
-(defvar exwm-input--update-focus-window-buffer nil
-  "Buffer displayed in `exwm-input--update-focus-window'.
-Helps us discern whether a `buffer-list-update-hook' was caused by the selected
-window switching to a different buffer.")
-
 (defvar exwm-input--echo-area-timer nil "Timer for detecting echo area dirty.")
 
 (defvar exwm-input--event-hook nil
@@ -164,8 +159,6 @@ Current buffer will be the `exwm-mode' buffer when this hook runs.")
 (declare-function exwm-layout--iconic-state-p "exwm-layout.el" (&optional id))
 (declare-function exwm-layout--show "exwm-layout.el" (id &optional window))
 (declare-function exwm-reset "exwm.el" ())
-(declare-function exwm-workspace--client-p "exwm-workspace.el"
-                  (&optional frame))
 (declare-function exwm-workspace--minibuffer-own-frame-p "exwm-workspace.el")
 (declare-function exwm-workspace--workspace-p "exwm-workspace.el" (workspace))
 (declare-function exwm-workspace-switch "exwm-workspace.el"
@@ -301,24 +294,14 @@ ARGS are additional arguments to CALLBACK."
 
 (defun exwm-input--on-buffer-list-update ()
   "Run in `buffer-list-update-hook' to track input focus."
-  ;; `buffer-list-update-hook' is invoked by several functions
-  ;; (`get-buffer-create', `select-window', `with-temp-buffer', etc.), but we
-  ;; just want to notice when a different window has been selected, or when the
-  ;; selected window displays a different buffer, so that we can set the focus
-  ;; to the associated X window (in case of an `exwm-mode' buffer).  In order to
-  ;; differentiate, we keep track of the last selected window and buffer in the
-  ;; `exwm-input--update-focus-window' and
-  ;; `exwm-input--update-focus-window-buffer' variables.
-  (let* ((win (selected-window))
-         (buf (window-buffer win)))
-    (when (and (not (exwm-workspace--client-p))
-               (not (and (eq exwm-input--update-focus-window win)
-                         (eq exwm-input--update-focus-window-buffer buf))))
-      (exwm--log "selected-window=%S current-buffer=%S" win buf)
-      (setq exwm-input--update-focus-window win)
-      (setq exwm-input--update-focus-window-buffer buf)
-      (redirect-frame-focus (selected-frame) nil)
-      (exwm-input--update-focus-defer))))
+  (when (and          ; this hook is called incesantly; place cheap tests on top
+         (not exwm-input--skip-buffer-list-update)
+         (exwm--terminal-p))      ; skip other terminals, e.g. TTY client frames
+    (exwm--log "current-buffer=%S selected-window=%S"
+               (current-buffer) (selected-window))
+    (redirect-frame-focus (selected-frame) nil)
+    (setq exwm-input--update-focus-window (selected-window))
+    (exwm-input--update-focus-defer)))
 
 (defun exwm-input--update-focus-defer ()
   "Defer updating input focus."
@@ -1116,37 +1099,40 @@ One use is to access the keymap bound to KEYS (as prefix keys) in char-mode."
 
 (defun exwm-input--on-minibuffer-setup ()
   "Run in `minibuffer-setup-hook' to grab keyboard if necessary."
-  (exwm--log)
-  (with-current-buffer
-      (window-buffer (frame-selected-window exwm-workspace--current))
-    (when (and (derived-mode-p 'exwm-mode)
-               (not (exwm-workspace--client-p))
-               (eq exwm--selected-input-mode 'char-mode))
-      (exwm-input--grab-keyboard exwm--id))))
+  (let* ((window (or (minibuffer-selected-window) ; minibuffer-setup-hook
+                     (selected-window)))          ; echo-area-clear-hook
+         (frame (window-frame window)))
+    (when (exwm--terminal-p frame)
+      (with-current-buffer (window-buffer window)
+        (when (and (derived-mode-p 'exwm-mode)
+                   (eq exwm--selected-input-mode 'char-mode))
+          (exwm--log "Grab #x%x window=%s frame=%s" exwm--id window frame)
+          (exwm-input--grab-keyboard exwm--id))))))
 
 (defun exwm-input--on-minibuffer-exit ()
   "Run in `minibuffer-exit-hook' to release keyboard if necessary."
-  (exwm--log)
-  (with-current-buffer
-      (window-buffer (frame-selected-window exwm-workspace--current))
-    (when (and (derived-mode-p 'exwm-mode)
-               (not (exwm-workspace--client-p))
-               (eq exwm--selected-input-mode 'char-mode)
-               (eq exwm--input-mode 'line-mode))
-      (exwm-input--release-keyboard exwm--id))))
+  (let* ((window (or (minibuffer-selected-window) ; minibuffer-setup-hook
+                     (selected-window)))          ; echo-area-clear-hook
+         (frame (window-frame window)))
+    (when (exwm--terminal-p frame)
+      (with-current-buffer (window-buffer window)
+        (when (and (derived-mode-p 'exwm-mode)
+                   (eq exwm--selected-input-mode 'char-mode)
+                   (eq exwm--input-mode 'line-mode))
+          (exwm--log "Release #x%x window=%s frame=%s" exwm--id window frame)
+          (exwm-input--release-keyboard exwm--id))))))
 
 (defun exwm-input--on-echo-area-dirty ()
   "Run when new message arrives to grab keyboard if necessary."
-  (exwm--log)
-  (when (and (not (active-minibuffer-window))
-             (not (exwm-workspace--client-p))
-             cursor-in-echo-area)
+  (when (and cursor-in-echo-area
+             (not (active-minibuffer-window)))
+    (exwm--log)
     (exwm-input--on-minibuffer-setup)))
 
 (defun exwm-input--on-echo-area-clear ()
   "Run in `echo-area-clear-hook' to release keyboard if necessary."
-  (exwm--log)
   (unless (current-message)
+    (exwm--log)
     (exwm-input--on-minibuffer-exit)))
 
 (defun exwm-input--init ()