bug#4147: 23.1.50: Info-search command strange behaviour

[martin rudalics]

> All next/prev/up navigations links work from the "header-line" window
> without additional efforts thanks to the following existing code in
> Info-next/Info-prev/Info-up:
>
>     (or (eq major-mode 'Info-mode) (pop-to-buffer "*info*"))

Would this work with cloned Info buffers?  In any case `pop-to-buffer'
is way too fragile to be generally useful.

> that after clicking on a link in the "header-line" window moves the
> current focus from the "header-line" window to the window with the
> Info buffer.  (The links are not yet displayed as blue underlined text,
> but nevertheless work well).

The code should suppress displaying scrollbars in header-windows.

martin