From: Eli Zaretskii <eliz@gnu.org>
Date: Wed, 8 Apr 2009 13:51:48 +0000 (+0000)
Subject: (msdos-last-help-message): New defvar.
X-Git-Tag: emacs-pretest-23.0.93~197
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=9993f59a8583c0934913c76618b39429dbbca285;p=emacs.git

(msdos-last-help-message): New defvar.
(msdos-show-help): Use it to avoid saving the last message if it was also
a help message (Bug#2895).
---

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index d4cdf2257c8..33b315367ba 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,9 @@
 2009-04-08  Eli Zaretskii  <eliz@gnu.org>
 
+	* term/pc-win.el (msdos-last-help-message): New defvar.
+	(msdos-show-help): Use it to avoid saving the last message if it
+	was also a help message (Bug#2895).
+
 	* mail/rmail.el (rmail-simplified-subject): Normalize whitespace
 	in subject.  This resurrects a feature, lost in transition to
 	mbox, whereby Subject is matched even if it's broken into several
diff --git a/lisp/term/pc-win.el b/lisp/term/pc-win.el
index b0e62b1596c..6fb714c1412 100644
--- a/lisp/term/pc-win.el
+++ b/lisp/term/pc-win.el
@@ -248,23 +248,30 @@ support other types of selections."
 (fset 'set-cursor-color 'ignore)	; Hardware determined by char under.
 (fset 'set-border-color 'ignore)	; Not useful.
 
+(defvar msdos-last-help-message nil
+  "The last help message received via `show-help-function'.
+This is used by `msdos-show-help'.")
+
 (defvar msdos-previous-message nil
   "The content of the echo area before help echo was displayed.")
 
 (defun msdos-show-help (help)
   "Function installed as `show-help-function' on MS-DOS frames."
   (when (and (not (window-minibuffer-p)) ;Don't overwrite minibuffer contents.
-             ;; Don't know how to reproduce it in Elisp:
-             ;; Don't overwrite a keystroke echo.
-             ;; (NILP (echo_message_buffer) || ok_to_overwrite_keystroke_echo)
              (not cursor-in-echo-area)) ;Don't overwrite a prompt.
     (cond
      ((stringp help)
-      (unless msdos-previous-message
+      (setq help (replace-regexp-in-string "\n" ", " help))
+      (unless (or msdos-previous-message
+		  (string-equal help (current-message))
+		  (and (stringp msdos-last-help-message)
+		       (string-equal msdos-last-help-message
+				     (current-message))))
         (setq msdos-previous-message (current-message)))
+      (setq msdos-last-help-message help)
       (let ((message-truncate-lines nil)
             (message-log-max nil))
-        (message "%s" (replace-regexp-in-string "\n" ", " help))))
+        (message "%s" help)))
      ((stringp msdos-previous-message)
       (let ((message-log-max nil))
         (message "%s" msdos-previous-message)