From 4ac03187067e06eaddc7277e63e95e63aacaea24 Mon Sep 17 00:00:00 2001
From: "Kim F. Storm" <storm@cua.dk>
Date: Mon, 7 Feb 2005 11:44:00 +0000
Subject: [PATCH] (Fprimitive_undo): Record max one dummmy apply element.

---
 src/undo.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/src/undo.c b/src/undo.c
index eaf312be676..5483060eb48 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -1,5 +1,6 @@
 /* undo handling for GNU Emacs.
-   Copyright (C) 1990, 1993, 1994, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1990, 1993, 1994, 2000, 2002, 2004, 2005
+	Free Software Foundation, Inc.
 
 This file is part of GNU Emacs.
 
@@ -454,6 +455,8 @@ Return what remains of the list.  */)
   Lisp_Object next;
   int count = SPECPDL_INDEX ();
   register int arg;
+  Lisp_Object oldlist;
+  int did_apply = 0;
 
 #if 0  /* This is a good feature, but would make undo-start
 	  unable to do what is expected.  */
@@ -470,6 +473,8 @@ Return what remains of the list.  */)
   arg = XINT (n);
   next = Qnil;
   GCPRO2 (next, list);
+  /* I don't think we need to gcpro oldlist, as we use it only
+     to check for EQ.  ++kfs  */
 
   /* In a writable buffer, enable undoing read-only text that is so
      because of text properties.  */
@@ -479,6 +484,8 @@ Return what remains of the list.  */)
   /* Don't let `intangible' properties interfere with undo.  */
   specbind (Qinhibit_point_motion_hooks, Qt);
 
+  oldlist = current_buffer->undo_list;
+
   while (arg > 0)
     {
       while (CONSP (list))
@@ -549,7 +556,6 @@ Return what remains of the list.  */)
 		}
 	      else if (EQ (car, Qapply))
 		{
-		  Lisp_Object oldlist = current_buffer->undo_list;
 		  /* Element (apply FUNNAME . ARGS) means call FUNNAME to undo.  */
 		  car = Fcar (cdr);
 		  if (INTEGERP (car))
@@ -560,13 +566,7 @@ Return what remains of the list.  */)
 		    }
 		  cdr = Fcdr (cdr);
 		  apply1 (car, cdr);
-
-		  /* Make sure this produces at least one undo entry,
-		     so the test in `undo' for continuing an undo series
-		     will work right.  */
-		  if (EQ (oldlist, current_buffer->undo_list))
-		    current_buffer->undo_list
-		      = Fcons (list3 (Qapply, Qcdr, Qnil), current_buffer->undo_list);
+		  did_apply = 1;
 		}
 	      else if (STRINGP (car) && INTEGERP (cdr))
 		{
@@ -611,6 +611,15 @@ Return what remains of the list.  */)
       arg--;
     }
 
+
+  /* Make sure an apply entry produces at least one undo entry,
+     so the test in `undo' for continuing an undo series
+     will work right.  */
+  if (did_apply
+      && EQ (oldlist, current_buffer->undo_list))
+    current_buffer->undo_list
+      = Fcons (list3 (Qapply, Qcdr, Qnil), current_buffer->undo_list);
+
   UNGCPRO;
   return unbind_to (count, list);
 }
-- 
2.39.2