Add 'NO-OUTPUT display-style option which does full update of internal

data structures, but does not update the screen.

diff --git a/v7/src/edwin/screen.scm b/v7/src/edwin/screen.scm
index 9f5508e2cbced8a5e8e67bd643be3e2df1506281..533a223786fc8fb1126b54c3e671f192a7455d8d 100644 (file)
--- a/v7/src/edwin/screen.scm
+++ b/v7/src/edwin/screen.scm
@@ -1,6 +1,6 @@
 ;;; -*-Scheme-*-
 ;;;
-;;;    $Id: screen.scm,v 1.103 1993/08/16 08:04:03 cph Exp $
+;;;    $Id: screen.scm,v 1.104 1994/03/08 22:04:44 cph Exp $
 ;;;
 ;;;    Copyright (c) 1989-93 Massachusetts Institute of Technology
 ;;;
@@ -650,7 +650,8 @@
               (lambda ()
                 (and (thunk)
                      (or (not (screen-needs-update? screen))
-                         (screen-update screen display-style))
+                         (and (not (eq? 'NO-OUTPUT display-style))
+                              (screen-update screen display-style)))
                      (begin
                        (screen-update-cursor screen)
                        true))))))