Fix crash when unfolding a device.

Fix a crash when unfolding a device with reference implementation.
There is a crash because we get a callback before changes propagate.

Bug: 218980376
Test: manual - open the fold samples with config changing app.
 fold and unfold the device.
Change-Id: I3c99058e47e29b18a30921bc23b14182e970ac65

libs/WindowManager/Jetpack/src/androidx/window/extensions/layout/WindowLayoutComponentImpl.java

@@ -200,12 +200,23 @@ public class WindowLayoutComponentImpl implements WindowLayoutComponent {
                 rotateRectToDisplayRotation(displayId, featureRect);
                 transformToWindowSpaceRect(activity, featureRect);
 
-                features.add(new FoldingFeature(featureRect, baseFeature.getType(), state));
+                if (!isRectZero(featureRect)) {
+                    // TODO(b/228641877) Remove guarding if when fixed.
+                    features.add(new FoldingFeature(featureRect, baseFeature.getType(), state));
+                }
             }
         }
         return features;
     }
 
+    /**
+     * Returns {@link true} if a {@link Rect} has zero width and zero height,
+     * {@code false} otherwise.
+     */
+    private boolean isRectZero(Rect rect) {
+        return rect.width() == 0 && rect.height() == 0;
+    }
+
     private final class NotifyOnConfigurationChanged extends EmptyLifecycleCallbacksAdapter {
         @Override
         public void onActivityCreated(Activity activity, Bundle savedInstanceState) {