bug#11068: 24.0.94; Face-remapped background does not extend to end of window

[martin rudalics]

> Nitpick, you want (make-overlay (point-max) (point-max) nil t t) if you
> want to create an overlay "at EOB" rather than "right after the char
> which is currently at (point-max)".

In my use case I always deleted the overlay before redisplay and
recreated it anew to account for possible changes in window height.

> Cursor positioning should be
> sensitive to these kinds of stickiness details, although IIRC it
> currently isn't.

Unfortunately it isn't.  I then played with all sorts of 'display
'before-string properties, arguments, and whatever I could apply
(some ten years ago).

martin