emacs smooth scrolling not effect after system upgrade to MacOS 10.12
<p>I have used Gnu Emacs 24.5.1 under MacBook/MacOS 10.11.6.
And I have a good "smooth scrolling" (use trackpad) with a correct setting in .emacs:</p>

<pre><code>(setq mouse-wheel-scroll-amount '(1 ((shift) . 1) ((control) . nil)))
(setq mouse-wheel-progressive-speed nil)
</code></pre>

<p>But, after I upgrade to MacOS Sierra (10.12), the smooth scrolling seems have no effect anymore. I notice that every scroll still has 1 line per step. But the "mouse-wheel-progressive-speed" seems not work correctly.</p>

<p>After upgrade to MacOS Sierra, the other applications still have "correct" scrolling style, e.g. iTerm2. </p>

<p>Please help and many thanks! </p>