Fixing issue with cancelled drag blocking cell spaces (Issue 5386523)

Change-Id: I9cfc728edeeee2237c21935517107e7a2af49646

src/com/android/launcher2/Workspace.java

@@ -3051,6 +3051,9 @@ public class Workspace extends SmoothPagedView
             }
             cellLayout.onDropChild(mDragInfo.cell);
         }
+        if (d.cancelled &&  mDragInfo.cell != null) {
+                mDragInfo.cell.setVisibility(VISIBLE);
+        }
         mDragOutline = null;
         mDragInfo = null;
     }