title: Android widget Image preview is not changing even after deleting the by default image in AS
body: <p>Here is the <code>widget_info.xml</code></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
  android:initialKeyguardLayout="@layout/new_app_widget"
  android:initialLayout="@layout/new_app_widget"
  android:minHeight="40dp"
  android:minWidth="180dp"
  android:previewImage="@drawable/example_appwidget_preview"
  android:resizeMode="horizontal|vertical"
  android:updatePeriodMillis="86400000"
  android:widgetCategory="home_screen"/&gt;
  </code></pre>
  
  <p>This is by default when we create the widget, but the problem is whatever  i do either the delete the previewImage mentioned in the code or modify it, it will still show the same default image but it won't change to the drawable that i have provided. why???</p>