Dedupe Items on Workspace for hotseat prediction

Bug:145236832
Test:Manual
Change-Id: I46da38998486c7f58aca829d33b42cbb04da515a

src/com/android/launcher3/DeleteDropTarget.java

@@ -113,6 +113,7 @@ public class DeleteDropTarget extends ButtonDropTarget {
     public void onDrop(DragObject d, DragOptions options) {
         if (canRemove(d.dragInfo)) {
             mLauncher.getModelWriter().prepareToUndoDelete();
+            d.dragInfo.container = NO_ID;
         }
         super.onDrop(d, options);
     }