Fixed a hole in the shade that could exist with heads up

Change-Id: Ia7c36c717287e1c63218c105da83b41f0a40bc4b
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/stack/StackScrollAlgorithm.java b/packages/SystemUI/src/com/android/systemui/statusbar/stack/StackScrollAlgorithm.java
index 59b446b..36c26ec 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/stack/StackScrollAlgorithm.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/stack/StackScrollAlgorithm.java
@@ -544,7 +544,7 @@
             if (row.isPinned()) {
                 childState.yTranslation = Math.max(childState.yTranslation,
                         mNotificationsTopPadding);
-                childState.height = row.getHeadsUpHeight();
+                childState.height = Math.max(row.getHeadsUpHeight(), childState.height);
                 if (!isTopEntry) {
                     // Ensure that a headsUp doesn't vertically extend further than the heads-up at
                     // the top most z-position