Fix crash with bidi display on the last empty line (bug#6030).

 xdisp.c (display_line): Don't assume 2nd call to
 get_next_display_element cannot return zero.

src/ChangeLog

+2010-04-25  Eli Zaretskii  <eliz@gnu.org>
+
+	* xdisp.c (display_line): Fix crash with bidi display on the last
+	empty line.  (Bug#6030)
+
 2010-04-24  Eli Zaretskii  <eliz@gnu.org>
 
 	* xdisp.c (display_line): Use `reseat' instead of `reseat_1', and

src/xdisp.c

@@ -17979,9 +17979,8 @@ display_line (it)
 	  row_end = it->current;
 	  /* If the character at max_pos+1 is a newline, skip that as
 	     well.  Note that this may skip some invisible text.  */
-	  if (!get_next_display_element (it))
-	    abort ();
-	  if (ITERATOR_AT_END_OF_LINE_P (it))
+	  if (get_next_display_element (it)
+	      && ITERATOR_AT_END_OF_LINE_P (it))
 	    {
 	      set_iterator_to_next (it, 1);
 	      /* Record the position after the newline of a continued