Merge "Fixed an issue where the notification scrim could become transparent" into sc-dev am: f7477f8ff4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14843822

Change-Id: Id9e3ec6b44b39c89530ea5122e72461686fb90e4

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

@@ -2233,6 +2233,8 @@ public class NotificationPanelViewController extends PanelViewController {
             left = mNotificationStackScrollLayoutController.getLeft();
             right = mNotificationStackScrollLayoutController.getRight();
         }
+        // top should never be lower than bottom, otherwise it will be invisible.
+        top = Math.min(top, bottom);
         applyQSClippingBounds(left, top, right, bottom, visible);
     }