Merge "Don't bind scrollbar if current recycler view isn't changed." into main

src/com/android/launcher3/widget/picker/WidgetsFullSheet.java

@@ -295,8 +295,11 @@ public class WidgetsFullSheet extends BaseWidgetSheet
     }
 
     private void attachScrollbarToRecyclerView(WidgetsRecyclerView recyclerView) {
-        recyclerView.bindFastScrollbar(mFastScroller, WIDGET_SCROLLER);
         if (mCurrentWidgetsRecyclerView != recyclerView) {
+            // Bind scrollbar if changing the recycler view. If widgets list updates, since
+            // scrollbar is already attached to the recycler view, it will automatically adjust as
+            // needed with recycler view's onScrollListener.
+            recyclerView.bindFastScrollbar(mFastScroller, WIDGET_SCROLLER);
             // Only reset the scroll position & expanded apps if the currently shown recycler view
             // has been updated.
             reset();