QS Header: don't update everything unless we need to

am: d8fb07f534

Change-Id: I638dc6fbf81c9cec1fb6b25990b9e4091278383e

packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickStatusBarHeader.java

@@ -197,6 +197,7 @@ public class QuickStatusBarHeader extends BaseStatusBarHeader implements
 
     @Override
     public void setExpanded(boolean expanded) {
+        if (mExpanded == expanded) return;
         mExpanded = expanded;
         mHeaderQsPanel.setExpanded(expanded);
         updateEverything();