title: Disabled color state of Material button
body: <p>The Material Spec shows a disabled button state that looks greyed out.</p>
  
  <p><a href="https://www.material.io/design/components/buttons.html#toggle-button" rel="noreferrer">https://www.material.io/design/components/buttons.html#toggle-button</a></p>
  
  <p>I am using the MaterialButton from the material components from Android:
  <a href="https://www.material.io/develop/android/components/material-button/" rel="noreferrer">https://www.material.io/develop/android/components/material-button/</a></p>
  
  <p>However when setting the button to disabled the color/tint of the button does not change.</p>
  
  <pre><code>&lt;com.google.android.material.button.MaterialButton
      android:id="@+id/disabled_material_button"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:enabled="false"
      android:text="@string/button_label_disabled"/&gt;
  </code></pre>
  
  <p>Just not implemented in Material Android Components by default?  Does Material Components define a disabled button statelist?</p>