bug#38730: 27.0.50; tutorial start does not take into account the customization notice

[Eli Zaretskii]

> From: Jean-Christophe Helary <jean.christophe.helary@traduction-libre.org>
> Date: Tue, 24 Dec 2019 18:37:57 +0900
> 
> When starting the Tutorial in an emacs session that has modified
> keybindings, an information notice is displayed in red/bold characters at the 
> top of the screen.
> 
> That notice pushes the first step of the tutorial to below the visible space 
> of the frame. The user thus cannot see the first step and has to manually 
> scroll down to see it, which defeats the purpose of that first step where the 
> user learns to use C-v to move one screenful down...

I'm not sure what use case is described here.  If keybindings have
been modified, we probably aren't talking about a complete newcomer to
Emacs, so at least simple cursor motion should already be a skill
he/she already acquired, right?  He/she might already know to scroll
with PgDn or the mouse wheel, right?

OTOH, in a customized session, we can reasonably expect to see a
window that is larger than the default shown by "emacs -Q", and maybe
then the beginning of the tutorial will still be visible?

And if none of the above helps, then what kind of solution would you
propose for such a situation?