redisplay probs

[Miles Bader]

Redisplay seems screwed up, such that it often fails to update the
screen when it should.  I noticed this happening since yesterday
(2002-07-18), and it persists after today's CVS update.

Example:

    Horizontal scrolling should redisplay to reflect the scrolling, but
    doesn't:

       Make a long line, e.g., by `C-u 200 x', and then turn on
       truncate-lines with `C-u 1 M-x toggle-truncate-lines RET';
       You are at the end of the long-line, so the screen is now
       scrolled horizontally to show the end.

       Move to the beginning of the line with `C-a', which should
       horizontally scroll to the left margin -- and notice that
       the screen doesn't change, the cursor just disappears.

       You can fix it with C-l.

-Miles
-- 
`Life is a boundless sea of bitterness'