RE: scrollbar alternative

[Drew Adams]

> Therefore, I also disabled the scrollbar and now use some 
> code to get a scrollbar-like display in the mode-line.
> I know there's size-indication-mode, but I find an
> information like "13% of 2.8k" not very helpful.
>
> (defvar size-mode-line-max-length 30)

Presumably, you meant `size-mode-line-length', which is what is used in the rest
of the code.

(Why not replace %p too, instead of having both?)