Fixed a bug where the top child notification wasn't expandable

Because we also applied the hack to the expand helper to dismiss
the whole group instead of the child.

Bug: 27420342
Change-Id: I6179d3b99150c8005d0c45b6efdabb2de4dbe941
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/ExpandableNotificationRow.java b/packages/SystemUI/src/com/android/systemui/statusbar/ExpandableNotificationRow.java
index 12a83fd..27b94d1 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/ExpandableNotificationRow.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/ExpandableNotificationRow.java
@@ -411,8 +411,7 @@
     }
 
     public ExpandableNotificationRow getViewAtPosition(float y) {
-        if (!mIsSummaryWithChildren || !mChildrenExpanded
-                || (getNotificationChildren().size() == 1 && isClearable())) {
+        if (!mIsSummaryWithChildren || !mChildrenExpanded) {
             return this;
         } else {
             ExpandableNotificationRow view = mChildrenContainer.getViewAtPosition(y);
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java b/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
index 9b0dec1..cca3746 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
@@ -778,12 +778,15 @@
         if (child instanceof ExpandableNotificationRow) {
             ExpandableNotificationRow row = (ExpandableNotificationRow) child;
             ExpandableNotificationRow parent = row.getNotificationParent();
-            if (mGearExposedView != null && parent != null
-                    && parent.areChildrenExpanded() && mGearExposedView == parent) {
+            if (parent != null && parent.areChildrenExpanded()
+                    && (mGearExposedView == parent
+                        || (parent.getNotificationChildren().size() == 1
+                                && parent.isClearable()))) {
                 // In this case the group is expanded and showing the gear for the
                 // group, further interaction should apply to the group, not any
-                // child notifications so we use the parent of the child.
-                child = row.getNotificationParent();
+                // child notifications so we use the parent of the child. We also do the same
+                // if we only have a single child.
+                child = parent;
             }
         }
         return child;