title: Squashed icons in toolbar after change to Android SDK 26
body: <p>After changing my app from compiling/targeting SDK v25 to SDK v26, all of the menu icons in my app's toolbar are now squashed/squished/stretched.</p>
  
  <p>Here's the relevant layout code:</p>
  
  <pre><code>            &lt;android.support.design.widget.AppBarLayout
              android:id="@+id/appbar"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"&gt;
  
              &lt;RelativeLayout
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"&gt;
  
                  &lt;android.support.v7.widget.Toolbar
                      android:id="@+id/toolbar"
                      android:layout_width="match_parent"
                      android:layout_height="?attr/actionBarSize"
                      android:background="?attr/colorPrimary"
                      android:theme="@style/AppTheme.AppBarOverlay" /&gt;
  
                  &lt;br.com.mauker.materialsearchview.MaterialSearchView
                      android:id="@+id/search_view"
                      android:layout_width="match_parent"
                      android:layout_height="match_parent" /&gt;
  
              &lt;/RelativeLayout&gt;
  
          &lt;/android.support.design.widget.AppBarLayout&gt;
  </code></pre>
  
  <p>Here's a menu that squishes:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;menu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"&gt;
  
  &lt;item android:id="@+id/action_search"
      android:title="@string/search"
      android:icon="@drawable/ic_search_white_48dp"
      app:showAsAction="ifRoom" /&gt;
  
  &lt;item
      android:id="@+id/advanced_search"
      android:enabled="true"
      android:title="@string/advanced_search"
      app:showAsAction="never" /&gt;
  
  &lt;/menu&gt;
  </code></pre>
  
  <p>Here's another menu that squishes (they all do):</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;menu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"&gt;
  
  &lt;item
      android:id="@+id/add_photo"
      android:enabled="true"
      android:title="@string/add_photo"
      android:icon="@drawable/ic_add_a_photo_white_48dp"
      app:showAsAction="ifRoom" /&gt;
  
  &lt;/menu&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/jyGrg.png" rel="noreferrer">How it looks on SDK v25</a></p>
  
  <p><a href="https://i.stack.imgur.com/VSXIX.png" rel="noreferrer">How it looks on SDK v26</a></p>