bug#7368: display-buffer a softly dedicated window

[martin rudalics]

> Hm, nice idea. But isn't display-buffer-function called from
> display-buffer (infinite recursion)? I'll check it when I get to my
> Emacs box.

Whenever you call `display-buffer' from `display-buffer-function'
make sure that you've bound the latter to nil around the call.

martin