title: Weird artifact showing through nine-patch button
body: <p>I have created a simple 9patch to use for my button graphic.</p>
  
  <p><a href="https://i.stack.imgur.com/7vWBV.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7vWBV.png" alt="9patch example"></a></p>
  
  <p>When I view it as part of the layout editor, it appears to look okay.</p>
  
  <p><a href="https://i.stack.imgur.com/5h4U3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5h4U3.png" alt="enter image description here"></a></p>
  
  <p>However, when I run it in an emulator I get this ugly looking artifact/relic around the bottom left/top right corners. </p>
  
  <p><a href="https://i.stack.imgur.com/5KO4W.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5KO4W.png" alt="enter image description here"></a></p>
  
  <p>Does anyone know what causes this, and how I might fix it? I'm currently applying the 9patch using the android:background property.</p>