bug#5998: 23.1.96; Breadcrumbs defeat C-u 1 C-v in Info

[Juri Linkov]

>  C-u 1 C-v
>
> Note that the display does not scroll by one line.  "C-u 2 C-v" does
> scroll by 2 lines, as well as "C-u 1 C-v" if the breadcrumbs are not
> visible.

It seems the bug is in the display engine.  `move_it_to' in
`window_scroll_pixel_based' doesn't move point when it's on
the overlay with the breadcrumbs line.

-- 
Juri Linkov
http://www.jurta.org/emacs/