title: android.support.design.widget.FloatingActionButton implenetation of FAB reduces image size
body: <p>So I have started migrating to the official support design library for an Android app of mine, replacing elements as I go. I just replaced an <code>FAB</code> (implemented as <code>ImageButton</code>) with official <code>android.support.design.widget.FloatingActionButton</code>. But the icon inside the button is smaller as compared to the one it was in <code>ImageButton</code>. What may have been a reason?</p>
  
  <p><code>FloatingActionButton</code>'s implementation:</p>
  
  <pre><code>&lt;android.support.design.widget.FloatingActionButton
      android:id="@+id/fab"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:src="@drawable/icon" /&gt;
  </code></pre>
  
  <p>Tried adding <code>app:fabSize="normal</code> but that didn't work, either.</p>
  
  <p>This is how it looks after using <code>FloatingActionButton</code>:</p>
  
  <p><img src="https://i.stack.imgur.com/FjHyD.png" alt="enter image description here"></p>
  
  <p>And this is how it looked like while using it as a <code>ImageButton</code>:</p>
  
  <p><img src="https://i.stack.imgur.com/EGBn0.png" alt="enter image description here"></p>