Fix use of drawing cache in Launcher.

src/com/android/launcher/CellLayout.java

@@ -530,7 +530,7 @@ public class CellLayout extends ViewGroup {
             final View view = getChildAt(i);
             view.setDrawingCacheEnabled(enabled);
             // Update the drawing caches
-            view.buildDrawingCache();
+            view.buildDrawingCache(true);
         }
     }