QS: Fix single expanded frame from layout

During animation it was resetting the QS expansion on layout which
made a frame of fully expanded appear.

Bug: 28008271
Change-Id: I6ac44cb918bdf53da0653332eabf0f4e96779cff
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
index 522f250..5064d8e 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
@@ -1735,7 +1735,7 @@
 
     public void onQsHeightChanged() {
         mQsMaxExpansionHeight = mQsContainer.getDesiredHeight();
-        if (mQsExpanded) {
+        if (mQsExpanded && mQsFullyExpanded) {
             mQsExpansionHeight = mQsMaxExpansionHeight;
             requestScrollerTopPaddingUpdate(false /* animate */);
             requestPanelHeightUpdate();