From 3132e11599f4b3792f1a0dfebf91a1d52422160e Mon Sep 17 00:00:00 2001
From: "Richard M. Stallman" <rms@gnu.org>
Date: Fri, 20 Oct 1995 20:30:22 +0000
Subject: [PATCH 1/1] (dabbrev-expand): When no more expansions, Put back the
 original abbrev with its original case pattern.

---
 lisp/dabbrev.el | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lisp/dabbrev.el b/lisp/dabbrev.el
index a28c902357..8dbe062923 100644
--- a/lisp/dabbrev.el
+++ b/lisp/dabbrev.el
@@ -490,8 +490,10 @@ See also `dabbrev-abbrev-char-regexp' and \\[dabbrev-completion]."
       (if old
 	  (save-excursion
 	    (setq buffer-undo-list (cons orig-point buffer-undo-list))
-	    (search-backward (substring old (length abbrev)))
-	    (delete-region (match-beginning 0) (match-end 0))))
+	    ;; Put back the original abbrev with its original case pattern.
+	    (search-backward old)
+	    (insert abbrev)
+	    (delete-region (point) (+ (point) (length old)))))
       (error "No%s dynamic expansion for `%s' found"
 	     (if old " further" "") abbrev))
      (t
-- 
2.39.2