Abolish temporary buffer management for xref

* lisp/progmodes/xref.el (xref--temporary-buffers)
(xref--current)
(xref--inhibit-mark-current)
(xref--mark-selected): Remove.  Remove all references.
(xref--show-xrefs): Do not construct the
list of the temporary buffers, nor pass it along.

1 files changed, 6 insertions, 41 deletions

diff --git a/lisp/progmodes/xref.el b/lisp/progmodes/xref.el
index 360d1baf403..3aa85cb900d 100644
--- a/lisp/progmodes/xref.el
+++ b/lisp/progmodes/xref.el
@@ -414,20 +414,6 @@ WINDOW controls how the buffer is displayed:
 (defvar-local xref--display-history nil
   "List of pairs (BUFFER . WINDOW), for temporarily displayed buffers.")
 
-(defvar-local xref--temporary-buffers nil
-  "List of buffers created by xref code.")
-
-(defvar-local xref--current nil
-  "Non-nil if this buffer was once current, except while displaying xrefs.
-Used for temporary buffers.")
-
-(defvar xref--inhibit-mark-current nil)
-
-(defun xref--mark-selected ()
-  (unless xref--inhibit-mark-current
-    (setq xref--current t))
-  (remove-hook 'buffer-list-update-hook #'xref--mark-selected t))
-
 (defun xref--save-to-history (buf win)
   (let ((restore (window-parameter win 'quit-restore)))
     ;; Save the new entry if the window displayed another buffer
@@ -449,15 +435,9 @@ Used for temporary buffers.")
 
 (defun xref--show-location (location)
   (condition-case err
-      (let ((bl (buffer-list))
-            (xref--inhibit-mark-current t)
-            (marker (xref-location-marker location)))
-        (let ((buf (marker-buffer marker)))
-          (unless (memq buf bl)
-            ;; Newly created.
-            (add-hook 'buffer-list-update-hook #'xref--mark-selected nil t)
-            (push buf xref--temporary-buffers))
-          (xref--display-position marker t buf)))
+      (let* ((marker (xref-location-marker location))
+             (buf (marker-buffer marker)))
+        (xref--display-position marker t buf))
     (user-error (message (error-message-string err)))))
 
 (defun xref-show-location-at-point ()
@@ -594,8 +574,7 @@ Used for temporary buffers.")
 (defun xref-quit (&optional kill)
   "Bury temporarily displayed buffers, then quit the current window.
 
-If KILL is non-nil, kill all buffers that were created in the
-process of showing xrefs, and also kill the current buffer.
+If KILL is non-nil, also kill the current buffer.
 
 The buffers that the user has otherwise interacted with in the
 meantime are preserved."
@@ -607,13 +586,6 @@ meantime are preserved."
       (when (and (window-live-p win)
                  (eq buf (window-buffer win)))
         (quit-window nil win)))
-    (when kill
-      (let ((xref--inhibit-mark-current t)
-            kill-buffer-query-functions)
-        (dolist (buf xref--temporary-buffers)
-          (unless (buffer-local-value 'xref--current buf)
-            (kill-buffer buf)))
-        (setq xref--temporary-buffers nil)))
     (quit-window kill window)))
 
 (defconst xref-buffer-name "*xref*"
@@ -687,10 +659,6 @@ Return an alist of the form ((FILENAME . (XREF ...)) ...)."
         (pop-to-buffer (current-buffer))
         (goto-char (point-min))
         (setq xref--window (assoc-default 'window alist))
-        (setq xref--temporary-buffers (assoc-default 'temporary-buffers alist))
-        (dolist (buf xref--temporary-buffers)
-          (with-current-buffer buf
-            (add-hook 'buffer-list-update-hook #'xref--mark-selected nil t)))
         (current-buffer)))))
 
 
@@ -708,9 +676,7 @@ Return an alist of the form ((FILENAME . (XREF ...)) ...)."
 (defvar xref--read-pattern-history nil)
 
 (defun xref--show-xrefs (input kind arg window)
-  (let* ((bl (buffer-list))
-         (xrefs (funcall xref-find-function kind arg))
-         (tb (cl-set-difference (buffer-list) bl)))
+  (let* ((xrefs (funcall xref-find-function kind arg)))
     (cond
      ((null xrefs)
       (user-error "No %s found for: %s" (symbol-name kind) input))
@@ -720,8 +686,7 @@ Return an alist of the form ((FILENAME . (XREF ...)) ...)."
      (t
       (xref-push-marker-stack)
       (funcall xref-show-xrefs-function xrefs
-               `((window . ,window)
-                 (temporary-buffers . ,tb)))))))
+               `((window . ,window)))))))
 
 (defun xref--prompt-p (command)
   (or (eq xref-prompt-for-identifier t)