Fix bug where all apps items fade in.

Removes all Add/Change/Move/Remove animations by
clearing the AllAppsRecyclerView ItemAnimator.

Bug: 64675794
Change-Id: I41f975ab6be4bf48c483828ea6f109382a8a9320
(cherry picked from commit 7dfabaa02bdcf7d9307e11fa490c097bdc990025)
diff --git a/src/com/android/launcher3/allapps/AllAppsContainerView.java b/src/com/android/launcher3/allapps/AllAppsContainerView.java
index ede3bea..828a347 100644
--- a/src/com/android/launcher3/allapps/AllAppsContainerView.java
+++ b/src/com/android/launcher3/allapps/AllAppsContainerView.java
@@ -224,8 +224,8 @@
         mAppsRecyclerView.setLayoutManager(mLayoutManager);
         mAppsRecyclerView.setAdapter(mAdapter);
         mAppsRecyclerView.setHasFixedSize(true);
-        // Removes the animation that can occur when updating the predicted apps in place.
-        mAppsRecyclerView.getItemAnimator().setChangeDuration(0);
+        // No animations will occur when changes occur to the items in this RecyclerView.
+        mAppsRecyclerView.setItemAnimator(null);
         if (FeatureFlags.LAUNCHER3_PHYSICS) {
             mAppsRecyclerView.setSpringAnimationHandler(mSpringAnimationHandler);
         }