AbsListView does not populate accessibility events correctly.

The toIndex of accessibility events fired from a AbsListView
is exclusive but should be inclusive i.e. it was reported one
more that it has to be.

bug:5256286

Change-Id: I496959fdfb6760b0c74899730c4cc558e89234a6

core/java/android/widget/AdapterView.java

@@ -926,8 +926,10 @@ public abstract class AdapterView<T extends Adapter> extends ViewGroup {
         }
         event.setItemCount(getCount());
         event.setCurrentItemIndex(getSelectedItemPosition());
-        event.setFromIndex(mFirstPosition);
-        event.setToIndex(mFirstPosition + getChildCount());
+        if (getChildCount() > 0) {
+            event.setFromIndex(getFirstVisiblePosition());
+            event.setToIndex(getLastVisiblePosition());
+        }
     }
 
     @Override