bug#18112: 24.4.50; emacs --daemon infinite loop in find_interval

[martin rudalics]

> As long as I have your attention: how about adding some comments
> and/or text to respective doc strings to explain what exactly the
> following functions do, and why/when are they needed?
>
>    window-normal-size
>    window-new-total
>    window-new-normal
>    window-new-pixel
>
> and the corresponding set-* functions.  Their doc strings are just
> tautological repetition of their names, which isn't helpful.  And the
> ELisp manual doesn't say a word about them, so the doc strings need to
> do a better job, IMO.

I've tried to do that now.  Please have a look.

Thanks, martin