Fix launcher crash after restore with some specific widgets.

The internal implementation of PendingAppWidgetHostView#getDefaultViews
uses the same view across updates which causes the exception in
AppWidgetHostView#applyContent when it tries to call addView() because
the view has already been added to its parent view in previous iteration.

Bug: 151901506
Test: manual
Change-Id: Ieccec814ac514e592d0d4f196b60ba89aec0d661

src/com/android/launcher3/widget/PendingAppWidgetHostView.java

@@ -52,7 +52,6 @@ public class PendingAppWidgetHostView extends LauncherAppWidgetHostView
     private static final float MIN_SATUNATION = 0.7f;
 
     private final Rect mRect = new Rect();
-    private View mDefaultView;
     private OnClickListener mClickListener;
     private final LauncherAppWidgetInfo mInfo;
     private final int mStartState;
@@ -111,12 +110,11 @@ public class PendingAppWidgetHostView extends LauncherAppWidgetHostView
 
     @Override
     protected View getDefaultView() {
-        if (mDefaultView == null) {
-            mDefaultView = mInflater.inflate(R.layout.appwidget_not_ready, this, false);
-            mDefaultView.setOnClickListener(this);
-            applyState();
-        }
-        return mDefaultView;
+        View defaultView = mInflater.inflate(R.layout.appwidget_not_ready, this, false);
+        defaultView.setOnClickListener(this);
+        applyState();
+        invalidate();
+        return defaultView;
     }
 
     @Override