I've described a workaround here, using text-scale-adjust:
https://gist.github.com/tjg/aacf48cf4bfe692a4d6b

On Thu, Jul 9, 2015 at 11:39 AM, Tayssir John Gabbour <tjg@pentaside.org>
wrote:

>
> - Start from: /Applications/Emacs.app/Contents/MacOS/Emacs --no-init-file
> - Switch to *scratch*
> - Eval: (set-face-attribute 'default nil :family "Monaco" :height 180)
> -   May need a bigger :height, depending on your screen size.
> - Then try to scroll to the top of your buffer. I can't see it.
>
>
>
>
> In GNU Emacs 24.5.1 (x86_64-apple-darwin13.4.0, NS apple-appkit-1265.21)
>  of 2015-04-10 on builder10-9.porkrind.org
> Windowing system distributor `Apple', version 10.3.1265
> Configured using:
>  `configure --with-ns '--enable-locallisppath=/Library/Application
>  Support/Emacs/${version}/site-lisp:/Library/Application
>  Support/Emacs/site-lisp''
>
> Important settings:
>   value of $LANG: en_US.UTF-8
>   locale-coding-system: utf-8-unix
>
> Major mode: Lisp Interaction
>
> Minor modes in effect:
>   tooltip-mode: t
>   electric-indent-mode: t
>   mouse-wheel-mode: t
>   tool-bar-mode: t
>   menu-bar-mode: t
>   file-name-shadow-mode: t
>   global-font-lock-mode: t
>   font-lock-mode: t
>   blink-cursor-mode: t
>   auto-composition-mode: t
>   auto-encryption-mode: t
>   auto-compression-mode: t
>   line-number-mode: t
>   transient-mark-mode: t
>
> Recent messages:
> For information about GNU Emacs and the GNU system, type C-h C-a.
> Mark set
> nil
>
> Load-path shadows:
> None found.
>
> Features:
> (shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
> easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
> mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
> mm-util help-fns mail-prsvr mail-utils time-date tooltip electric
> uniquify ediff-hook vc-hooks lisp-float-type mwheel ns-win tool-bar dnd
> fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
> prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
> mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
> utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
> japanese hebrew greek romanian slovak czech european ethiopic indian
> cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
> minibuffer nadvice loaddefs button faces cus-face macroexp files
> text-properties overlay sha1 md5 base64 format env code-pages mule
> custom widget hashtable-print-readable backquote make-network-process
> cocoa ns multi-tty emacs)
>
> Memory information:
> ((conses 16 72091 3946)
>  (symbols 48 17211 0)
>  (miscs 40 85 141)
>  (strings 32 9761 4406)
>  (string-bytes 1 260008)
>  (vectors 16 9009)
>  (vector-slots 8 375742 19352)
>  (floats 8 53 154)
>  (intervals 56 227 0)
>  (buffers 960 12))
>
>