am 1bb55501: Merge change I85f598e0 into eclair-mr2

Merge commit '1bb5550107eae60993dc35f2e917cb664f841255' into eclair-mr2-plus-aosp

* commit '1bb5550107eae60993dc35f2e917cb664f841255':
  Prevent transparent region from getting out of sync with Surface Flinger

core/java/android/view/ViewRoot.java

@@ -898,6 +898,7 @@ public final class ViewRoot extends Handler implements ViewParent,
                         // all at once.
                         newSurface = true;
                         fullRedrawNeeded = true;
+                        mPreviousTransparentRegion.setEmpty();
 
                         if (mGlWanted && !mUseGL) {
                             initializeGL();