Re: move_it_vertically_backward question

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: emacs-devel@gnu.org
> Date: Wed, 15 Dec 2021 09:18:43 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Why cannot it?
> 
> For example, if it has reached the beginning of the buffer, it doesn't
> make any sense to move further back.

If you want to detect that, you need to test IT_CHARPOS (it).