From: Chris Hanson <org/chris-hanson/cph>
Date: Mon, 1 Apr 1991 10:04:29 +0000 (+0000)
Subject: If a buffer has a `display-start' mark, and the buffer is narrowed,
X-Git-Tag: 20090517-FFI~10796
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=9cc4434828cf30664f227399ab1bc835059568bb;p=mit-scheme.git

If a buffer has a `display-start' mark, and the buffer is narrowed,
the `display-start' must be eliminated if it is outside the narrowed
region.
---

diff --git a/v7/src/edwin/struct.scm b/v7/src/edwin/struct.scm
index c3a5bae8d..d27a12048 100644
--- a/v7/src/edwin/struct.scm
+++ b/v7/src/edwin/struct.scm
@@ -1,6 +1,6 @@
 ;;; -*-Scheme-*-
 ;;;
-;;;	$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/struct.scm,v 1.74 1991/03/22 00:33:00 cph Exp $
+;;;	$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/edwin/struct.scm,v 1.75 1991/04/01 10:04:29 cph Exp $
 ;;;
 ;;;	Copyright (c) 1985, 1989-91 Massachusetts Institute of Technology
 ;;;
@@ -260,6 +260,14 @@
 	       (delq! daemon (vector-ref group group-index:delete-daemons))))
 
 (define (record-clipping! group start end)
+  (let ((buffer (group-buffer group)))
+    (if (and buffer
+	     (let ((display-start (buffer-display-start buffer)))
+	       (and display-start
+		    (let ((display-start (mark-index display-start)))
+		      (or (fix:< display-start start)
+			  (fix:> display-start end))))))
+	(set-buffer-display-start! buffer false)))
   (invoke-group-daemons! (group-clip-daemons group) group start end))
 
 (define (add-group-clip-daemon! group daemon)