Speed up some redisplay operations with very long lines (Bug#13675).

[gnu-emacs] / src / ChangeLog

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+2013-02-10  Eli Zaretskii  <eliz@gnu.org>
+
+       * xdisp.c (move_it_vertically_backward, move_it_by_lines): When
+       text lines are longer than window's screen lines, don't move back
+       too far.  This speeds up some redisplay operations.  (Bug#13675)
+
 2013-02-10  Dmitry Antipov  <dmantipov@yandex.ru>
 
        * syntax.c (scan_sexps_forward): Fix byte position calculation