Adding fade when dragging items outside of the customization tray.

Change-Id: Ie8dad00bc0278053707f81d948528929e6bb6f5c
diff --git a/src/com/android/launcher2/AllAppsPagedView.java b/src/com/android/launcher2/AllAppsPagedView.java
index caa1406..a424bc6 100644
--- a/src/com/android/launcher2/AllAppsPagedView.java
+++ b/src/com/android/launcher2/AllAppsPagedView.java
@@ -263,6 +263,10 @@
 
             // Toggle the selection on the dragged app
             Checkable checkable = (Checkable) v;
+
+            // Note: we toggle the checkable state to actually cause an alpha fade for the duration
+            // of the drag of the item.  (The fade-in will occur when all checked states are
+            // disabled when dragging ends)
             checkable.toggle();
         }