From: Richard M. Stallman <rms@gnu.org>
Date: Wed, 13 Apr 1994 00:16:31 +0000 (+0000)
Subject: (case-flip-character): Make case test more general.
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(case-flip-character): Make case test more general.
---

diff --git a/lisp/emulation/edt.el b/lisp/emulation/edt.el
index b6bc4071f8b..5ee298998cf 100644
--- a/lisp/emulation/edt.el
+++ b/lisp/emulation/edt.el
@@ -332,7 +332,8 @@ Accepts a prefix argument for the number of paragraphs."
 Accepts a prefix argument of the number of characters to invert."
   (interactive "p")
   (while (> num 0)
-    (funcall (if (<= ?a (following-char))
+    (funcall (if (let ((ch (following-char)))
+		   (= ch (downcase ch)))
 		 'upcase-region 'downcase-region)
 	     (point) (1+ (point)))
     (forward-char 1)