diff -c /home/rms/e20/src/xdisp.c.\~2\~ /home/rms/e20/src/xdisp.c
*** /home/rms/e20/src/xdisp.c.~2~	Thu Sep 10 10:58:09 1998
--- /home/rms/e20/src/xdisp.c	Sun Oct 11 21:14:15 1998
***************
*** 1951,1956 ****
--- 1951,1958 ----
        w->force_start = Qnil;
        /* Forget any recorded base line for line number display.  */
        w->base_line_number = Qnil;
+       /* The old bottom-of-screen position is no longer valid.  */
+       w->window_end_valid = Qnil;
        /* Redisplay the mode line.  Select the buffer properly for that.
  	 Also, run the hook window-scroll-functions
  	 because we have scrolled.  */
***************
*** 2275,2280 ****
--- 2277,2284 ----
  			  scroll_conservatively ? pos.vpos + 1 : scroll_step,
  			  w);
  
+ 	  /* The old bottom-of-screen position is no longer valid.  */
+ 	  w->window_end_valid = Qnil;
  	  if (! NILP (Vwindow_scroll_functions))
  	    {
  	      set_marker_both (w->start, Qnil, pos.bufpos, pos.bytepos);
***************
*** 2316,2321 ****
--- 2320,2327 ----
  			  scroll_conservatively ? -pos.vpos : - scroll_step,
  			  w);
  
+ 	  /* The old bottom-of-screen position is no longer valid.  */
+ 	  w->window_end_valid = Qnil;
  	  if (! NILP (Vwindow_scroll_functions))
  	    {
  	      set_marker_both (w->start, Qnil, pos.bufpos, pos.bytepos);
***************
*** 2356,2361 ****
--- 2362,2370 ----
  
        if (PT >= pos.bufpos)
  	{
+ 	  /* The old bottom-of-screen position is no longer valid.  */
+ 	  w->window_end_valid = Qnil;
+ 
  	  if (! NILP (Vwindow_scroll_functions))
  	    {
  	      set_marker_both (w->start, Qnil, pos.bufpos, pos.bytepos);
***************
*** 2406,2411 ****
--- 2415,2423 ----
    /* Set startp here explicitly in case that helps avoid an infinite loop
       in case the window-scroll-functions functions get errors.  */
    set_marker_both (w->start, Qnil, pos.bufpos, pos.bytepos);
+ 
+   /* The old bottom-of-screen position is no longer valid.  */
+   w->window_end_valid = Qnil;
    if (! NILP (Vwindow_scroll_functions))
      {
        run_hook_with_args_2 (Qwindow_scroll_functions, window,