bug#7307: 24.0.50; Mode line had more than just dashes removed

[Eli Zaretskii]

> From: Stephen Berman <stephen.berman@gmx.net>
> Date: Sat, 30 Oct 2010 01:05:32 +0200
> Cc: 
> 
> The only problem is specifying the length of the
> string: (window-width) as the maximum possible length fails here,
> because the mode line is constructed before the window-system frame, and
> has a value of just 10.  So I just picked 200 as a plausible maximum.
> Maybe there's a better way, but this seems to work ok.

Would it help to use window-width as the maximum?