From: Richard M. Stallman <rms@gnu.org>
Date: Sun, 21 Mar 1993 23:06:23 +0000 (+0000)
Subject: (struct window): New fields base_line_number and base_line_pos.
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(struct window): New fields base_line_number and base_line_pos.
---

diff --git a/src/window.h b/src/window.h
index cf43f508845..55bd3d06f79 100644
--- a/src/window.h
+++ b/src/window.h
@@ -159,6 +159,14 @@ struct window
     Lisp_Object display_table;
     /* Non-nil means window is marked as dedicated.  */
     Lisp_Object dedicated;
+    /* Line number and position of a line somewhere above the
+       top of the screen.  */
+    /* If this field is nil, it means we don't have a base line.  */
+    Lisp_Object base_line_number;
+    /* If this field is nil, it means we don't have a base line.
+       If it is a buffer, it means don't display the line number
+       as long as the window shows that buffer.  */
+    Lisp_Object base_line_pos;
   };
 
 /* 1 if W is a minibuffer window.  */