Fixing issue where flinging the Customize tray would scroll to the incorrect page after update.

Change-Id: I654665b065ad60414286ea16f7feae5054df604c
diff --git a/src/com/android/launcher2/PagedView.java b/src/com/android/launcher2/PagedView.java
index cb95235..511c960 100644
--- a/src/com/android/launcher2/PagedView.java
+++ b/src/com/android/launcher2/PagedView.java
@@ -500,6 +500,11 @@
         }
     }
 
+    protected void forceUpdateAdjacentPagesAlpha() {
+        mDirtyPageAlpha = true;
+        updateAdjacentPagesAlpha();
+    }
+
     protected void updateAdjacentPagesAlpha() {
         if (mFadeInAdjacentScreens) {
             if (mDirtyPageAlpha || (mTouchState == TOUCH_STATE_SCROLLING) || !mScroller.isFinished()) {