(struct window): New field optional_new_start.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/window.h b/src/window.h
index ba2f81e53d2..0e35ad0d8a7 100644
--- a/src/window.h
+++ b/src/window.h
@@ -112,6 +112,9 @@ struct window
     /* Non-nil means next redisplay must use the value of start
        set up for it in advance.  Set by scrolling commands.  */
     Lisp_Object force_start;
+    /* Non-nil means we have explicitly changed the value of start,
+       but that the next redisplay is not obliged to use the new value.  */
+    Lisp_Object optional_new_start;
     /* Number of columns display within the window is scrolled to the left.  */
     Lisp_Object hscroll;
     /* Number saying how recently window was selected */