From 9c13a46e078433f59c6e7e0532c13a1fa3340ec9 Mon Sep 17 00:00:00 2001
From: Juri Linkov <juri@jurta.org>
Date: Sat, 3 Apr 2010 02:01:22 +0300
Subject: [PATCH] * ehelp.el (electric-help-orig-major-mode): New buffer-local
 variable. (electric-help-mode): Set it to original major-mode.  Doc fix.
 (with-electric-help): Use `electric-help-orig-major-mode' instead of
 (default-value 'major-mode).  Doc fix.
 http://lists.gnu.org/archive/html/emacs-devel/2010-04/msg00069.html

---
 lisp/ChangeLog |  9 +++++++++
 lisp/ehelp.el  | 20 ++++++++++++++------
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index d402a57b1a8..83f666881d6 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,12 @@
+2010-04-02  Juri Linkov  <juri@jurta.org>
+
+	* ehelp.el (electric-help-orig-major-mode):
+	New buffer-local variable.
+	(electric-help-mode): Set it to original major-mode.  Doc fix.
+	(with-electric-help): Use `electric-help-orig-major-mode' instead
+	of (default-value 'major-mode).  Doc fix.
+	http://lists.gnu.org/archive/html/emacs-devel/2010-04/msg00069.html
+
 2010-04-02  Sam Steingold  <sds@gnu.org>
 
 	* vc-hg.el (vc-hg-push, vc-hg-pull): Use `apply' when calling
diff --git a/lisp/ehelp.el b/lisp/ehelp.el
index 7de4fd0ba63..63ec3838d32 100644
--- a/lisp/ehelp.el
+++ b/lisp/ehelp.el
@@ -94,10 +94,14 @@
     map)
   "Keymap defining commands available in `electric-help-mode'.")
 
+(defvar electric-help-orig-major-mode nil)
+(make-variable-buffer-local 'electric-help-orig-major-mode)
+
 (defun electric-help-mode ()
   "`with-electric-help' temporarily places its buffer in this mode.
-\(On exit from `with-electric-help', the buffer is put in default `major-mode'.)"
+\(On exit from `with-electric-help', the original `major-mode' is restored.)"
   (setq buffer-read-only t)
+  (setq electric-help-orig-major-mode major-mode)
   (setq mode-name "Help")
   (setq major-mode 'help)
   (setq mode-line-buffer-identification '(" Help:  %b"))
@@ -131,7 +135,7 @@ If THUNK returns non-nil, we don't do those things.
 
 When the user exits (with `electric-help-exit', or otherwise), the help
 buffer's window disappears (i.e., we use `save-window-excursion'), and
-BUFFER is put into default `major-mode' (or `fundamental-mode')."
+BUFFER is put back into its original major mode."
   (setq buffer (get-buffer-create (or buffer "*Help*")))
   (let ((one (one-window-p t))
 	(config (current-window-configuration))
@@ -170,13 +174,17 @@ BUFFER is put into default `major-mode' (or `fundamental-mode')."
       (set-buffer buffer)
       (setq buffer-read-only nil)
 
+      ;; Restore the original major mode saved by `electric-help-mode'.
       ;; We should really get a usable *Help* buffer when retaining
       ;; the electric one with `r'.  The problem is that a simple
-      ;; call to help-mode won't cut it; at least RET is bound wrong
-      ;; afterwards.  It's also not clear that `help-mode' is always
-      ;; the right thing, maybe we should add an optional parameter.
+      ;; call to `help-mode' won't cut it; e.g. RET is bound wrong
+      ;; afterwards (`View-scroll-line-forward' instead of `help-follow').
+      ;; That's because Help mode should be set with `with-help-window'
+      ;; instead of the direct call to `help-mode'. But at least
+      ;; RET works correctly on links after using `help-mode'.
+      ;; This is satisfactory enough.
       (condition-case ()
-          (funcall (or (default-value 'major-mode) 'fundamental-mode))
+          (funcall (or electric-help-orig-major-mode 'fundamental-mode))
         (error nil))
 
       (set-window-configuration config)
-- 
2.11.4.GIT