Got it. Thanks.

On Sun, Oct 29, 2017 at 7:18 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> From: Xiaolong Zhang <xlzhang921@gmail.com>
> Date: Sun, 29 Oct 2017 18:57:36 +0800
> Cc: 29036@debbugs.gnu.org
>
> If the file is already visited in Emacs, it won't recenter. Is it possible to make
> Emacs recenter even if it's already visited?

You can only do that by customizing the scrolling behavior in
general.  There's no special behavior for visiting a file that is
already in Emacs.