<p dir="auto">In the gallery, inside Page Selector, if you drag towards the right, you'll see the glow appear:</p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/5479/24467750/99f46a7c-146a-11e7-8d8e-f0d7765de7df.png"><img src="https://cloud.githubusercontent.com/assets/5479/24467750/99f46a7c-146a-11e7-8d8e-f0d7765de7df.png" alt="screenshot_20170329-102741" style="max-width: 100%;"></a></p>
<p dir="auto">Two things I noticed:</p>
<ul dir="auto">
<li>
<p dir="auto">the glow looks like a rectangle, instead of a curve (go into the Photos app to see a vertical glow with a curve on the left side of the screen)</p>
</li>
<li>
<p dir="auto">the glow is clipped by the page selector. Not sure if that's expected behavior.</p>
</li>
</ul>
<p dir="auto">The horizontal overscroll glow is being clipped or rendered incorrectly. The vertical overscroll glow is correctly rendered.</p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/37941/23495467/b4480a58-fecd-11e6-81f2-6037407e6cc9.jpg"><img src="https://cloud.githubusercontent.com/assets/37941/23495467/b4480a58-fecd-11e6-81f2-6037407e6cc9.jpg" alt="screenshot_20170301-221958-01" style="max-width: 100%;"></a></p>