title: android:elevation applied to toolbar AND its title
body: <p>I use a very simple style to format my Toolbar, I use android:elevation to display a shadow under the Toolbar like this:</p>
  
  <pre><code>&lt;style
      name="AppToolbarTheme"
      parent="AppTheme"&gt;
  
      &lt;item name="android:background"&gt;@color/colorPrimary&lt;/item&gt;
      &lt;item name="android:titleTextColor"&gt;@android:color/white&lt;/item&gt;
      &lt;item name="android:elevation"&gt;4dip&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>And I'm applying it simply like that:</p>
  
  <pre><code>&lt;Toolbar
      android:id="@+id/main_toolbar"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:theme="@style/AppToolbarTheme"/&gt;
  </code></pre>
  
  <p>The shadow displays under the toolbar like I want, howerver it is also somehow applied to the title of the toolbar which looks very weird:</p>
  
  <p><a href="https://i.stack.imgur.com/M6TyI.png" rel="noreferrer"><img src="https://i.stack.imgur.com/M6TyI.png" alt="enter image description here"></a></p>