Unable to avoid scrolling when switching buffers

By default, vim will purposefully try to vertically center the line that the
cursor was on most recently when coming back to a buffer (e.g. with Ctrl-^ or
:edit if the buffer is already loaded).

I find this disorienting. I would rather have my window and cursor position stay
exactly how I left it. The script here does exactly that:
http://vim.wikia.com/wiki/Avoid_scrolling_when_switch_buffers

That script seems to work almost always. However, there is one odd case where it
does not work because of perhaps a small bug in Vim:

Scenario Where the Above Script Does Not Restore Window
=======================================================

I start with a buffer (with a lot of lines relative to the height of the window)
scrolled all the way to the top (line 1 at the top of the window). I then move
my cursor to anywhere in the bottom half of the window (.e.g with L). Line 1 of
the buffer should still be visible at the top of the window.

When I switch to another buffer (e.g. with Ctrl-^) and then back again, the
window is not restored as expected. Instead, the line that I was on is in the
center.

----------------------------------------------------------------
:version
VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Nov 10 2017 18:06:39)
macOS version
Included patches: 1-1250
Compiled by Homebrew

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