Respect ‘switch-to-visible-buffer’ more rigidly. (Bug#20861)

* lisp/window.el (switch-to-visible-buffer): Doc adjustment.
(switch-to-prev-buffer, switch-to-next-buffer): Respect
switch-to-visible-buffer independent of the windows history.

Copyright-paperwork-exempt: yes

1 files changed, 8 insertions, 8 deletions

diff --git a/lisp/window.el b/lisp/window.el
index 6e4571167ea..a4ed9ea7216 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -3874,12 +3874,10 @@ before was current this also makes BUFFER the current buffer."
 (defcustom switch-to-visible-buffer t
   "If non-nil, allow switching to an already visible buffer.
 If this variable is non-nil, `switch-to-prev-buffer' and
-`switch-to-next-buffer' may switch to an already visible buffer
-provided the buffer was shown before in the window specified as
-argument to those functions.  If this variable is nil,
-`switch-to-prev-buffer' and `switch-to-next-buffer' always try to
-avoid switching to a buffer that is already visible in another
-window on the same frame."
+`switch-to-next-buffer' may switch to an already visible buffer.
+If this variable is nil, `switch-to-prev-buffer' and
+`switch-to-next-buffer' always try to avoid switching to a buffer
+that is already visible in another window on the same frame."
   :type 'boolean
   :version "24.1"
   :group 'windows)
@@ -3950,7 +3948,8 @@ to it."
                    (or (null pred) (funcall pred buffer))
                    (not (eq (aref (buffer-name buffer) 0) ?\s))
                    (or bury-or-kill (not (memq buffer next-buffers))))
-          (if (get-buffer-window buffer frame)
+          (if (and (not switch-to-visible-buffer)
+                   (get-buffer-window buffer frame))
               ;; Try to avoid showing a buffer visible in some other window.
               (unless visible
                 (setq visible buffer))
@@ -4052,7 +4051,8 @@ found."
                    (or (null pred) (funcall pred buffer))
                    (not (eq (aref (buffer-name buffer) 0) ?\s))
                    (not (assq buffer (window-prev-buffers window))))
-          (if (get-buffer-window buffer frame)
+          (if (and (not switch-to-visible-buffer)
+                   (get-buffer-window buffer frame))
               ;; Try to avoid showing a buffer visible in some other window.
               (setq visible buffer)
             (setq new-buffer buffer)