From: Richard M. Stallman <rms@gnu.org>
Date: Wed, 12 May 1993 20:32:32 +0000 (+0000)
Subject: (comint-filter): Increment opoint only if after insertion point.
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(comint-filter): Increment opoint only if after insertion point.
---

diff --git a/lisp/comint.el b/lisp/comint.el
index 5c0d27ccb89..0d49cba5590 100644
--- a/lisp/comint.el
+++ b/lisp/comint.el
@@ -662,7 +662,8 @@ Similarly for Soar, Scheme, etc."
 	  (nchars (length string)))
       (widen)
       (goto-char (process-mark process))
-      (setq opoint (+ opoint nchars))
+      (if (<= (point) opoint)
+	  (setq opoint (+ opoint nchars)))
       ;; Insert after old_begv, but before old_zv.
       (if (< (point) obeg)
 	  (setq obeg (+ obeg nchars)))