bug#18545: 24.4.50: Bug - forward-line inside with-selected-window

[Eli Zaretskii]

> Date: Sun, 28 Sep 2014 21:04:00 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: lompik@voila.fr, 18545@debbugs.gnu.org
> 
> I don't understand the
> 
>         || w->vscroll || w->cursor.vpos == 0
> 
> disjuncts in the second conditional.

I think w->vscroll means the window is vscrolled, and so the fact that
a row is not fully visible doesn't count (since that's what vscroll
does), and w->cursor.vpos == 0 means you have a very tall row that is
taller than the window, in which case it again gains us nothing to
consider it not fully visible.