Don't kill the *info* buffer in `Info-revert-find-node'.

Add `revert-buffer' to defcustom `Info-hide-node-references'.

* lisp/info.el (Info-hide-note-references): Add `:set' tag to `defcustom'
that calls `revert-buffer' on all Info buffers. 
(Info-revert-find-node): Remove let-bindings `old-buffer-name',
`old-history', `old-history-forward'.  Add let-binding
`window-selected'.  Remove calls to `kill-buffer',
`switch-to-buffer' and `Info-mode'.  Set `Info-current-file' to nil
before calling `Info-find-node', so `Info-find-node-2' will reread
the Info file.  Restore window positions only when `window-selected'
is non-nil.

Fixes: debbugs:9915

2 files changed, 25 insertions, 15 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index c66d9c6112c..fb28caeffbe 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,17 @@
 2011-11-19  Juri Linkov  <juri@jurta.org>
 
+        * info.el (Info-hide-note-references): Add `:set' tag to `defcustom'
+        that calls `revert-buffer' on all Info buffers.  (Bug#9915)
+        (Info-revert-find-node): Remove let-bindings `old-buffer-name',
+        `old-history', `old-history-forward'.  Add let-binding
+        `window-selected'.  Remove calls to `kill-buffer',
+        `switch-to-buffer' and `Info-mode'.  Set `Info-current-file' to nil
+        before calling `Info-find-node', so `Info-find-node-2' will reread
+        the Info file.  Restore window positions only when `window-selected'
+        is non-nil.
+
+2011-11-19  Juri Linkov  <juri@jurta.org>
+
         * isearch.el (isearch-lazy-highlight-new-loop):
         Remove condition `(not isearch-error)'.  (Bug#9918)
 
diff --git a/lisp/info.el b/lisp/info.el
index 338f6cb5e65..8af1bb04f90 100644
--- a/lisp/info.el
+++ b/lisp/info.el
@@ -231,6 +231,12 @@ want to set `Info-refill-paragraphs'."
                  (const :tag "Replace tag and hide reference" t)
                  (const :tag "Hide tag and reference" hide)
                  (other :tag "Only replace tag" tag))
+  :set (lambda (sym val)
+         (set sym val)
+         (dolist (buffer (buffer-list))
+           (with-current-buffer buffer
+             (when (eq major-mode 'Info-mode)
+               (revert-buffer t t)))))
   :group 'info)
 
 (defcustom Info-refill-paragraphs nil
@@ -811,10 +817,6 @@ otherwise, that defaults to `Top'."
            (concat default-directory (buffer-name))))
   (Info-find-node-2 nil nodename))
 
-;; It's perhaps a bit nasty to kill the *info* buffer to force a re-read,
-;; but at least it keeps this routine (which is for makeinfo-buffer and
-;; Info-revert-buffer-function) out of the way of normal operations.
-;;
 (defun Info-revert-find-node (filename nodename)
   "Go to an Info node FILENAME and NODENAME, re-reading disk contents.
 When *info* is already displaying FILENAME and NODENAME, the window position
@@ -822,27 +824,23 @@ is preserved, if possible."
   (or (eq major-mode 'Info-mode) (switch-to-buffer "*info*"))
   (let ((old-filename Info-current-file)
         (old-nodename Info-current-node)
-        (old-buffer-name (buffer-name))
+        (window-selected (eq (selected-window) (get-buffer-window)))
         (pcolumn      (current-column))
         (pline        (count-lines (point-min) (line-beginning-position)))
         (wline        (count-lines (point-min) (window-start)))
-        (old-history-forward Info-history-forward)
-        (old-history  Info-history)
         (new-history  (and Info-current-file
                            (list Info-current-file Info-current-node (point)))))
-    (kill-buffer (current-buffer))
-    (switch-to-buffer (or old-buffer-name "*info*"))
-    (Info-mode)
+    ;; When `Info-current-file' is nil, `Info-find-node-2' rereads the file.
+    (setq Info-current-file nil)
     (Info-find-node filename nodename)
-    (setq Info-history-forward old-history-forward)
-    (setq Info-history old-history)
     (if (and (equal old-filename Info-current-file)
              (equal old-nodename Info-current-node))
         (progn
           ;; note goto-line is no good, we want to measure from point-min
-          (goto-char (point-min))
-          (forward-line wline)
-          (set-window-start (selected-window) (point))
+          (when window-selected
+            (goto-char (point-min))
+            (forward-line wline)
+            (set-window-start (selected-window) (point)))
           (goto-char (point-min))
           (forward-line pline)
           (move-to-column pcolumn))