Fixing EmptyStackException (issue 6117943)

Change-Id: If5816c654dc1e4d5de1e72804e4cf1e845336a96
diff --git a/src/com/android/launcher2/CellLayout.java b/src/com/android/launcher2/CellLayout.java
index e8d5c19..01ab8ec 100644
--- a/src/com/android/launcher2/CellLayout.java
+++ b/src/com/android/launcher2/CellLayout.java
@@ -326,6 +326,7 @@
         mCountY = y;
         mOccupied = new boolean[mCountX][mCountY];
         mTmpOccupied = new boolean[mCountX][mCountY];
+        mTempRectStack.clear();
         requestLayout();
     }