Merge "Fix pinched short notification at bottom of lockscreen." into tm-qpr-dev am: 2f63c77bca

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19193766

Change-Id: I43c561db47e1fd08fe905ccb8b2fa05332455fd2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

packages/SystemUI/src/com/android/systemui/statusbar/NotificationShelf.java

@@ -398,7 +398,14 @@ public class NotificationShelf extends ActivatableNotificationView implements
             if (child instanceof ActivatableNotificationView) {
                 ActivatableNotificationView anv =
                         (ActivatableNotificationView) child;
-                updateCornerRoundnessOnScroll(anv, viewStart, shelfStart);
+                // Because we show whole notifications on the lockscreen, the bottom notification is
+                // always "just about to enter the shelf" by normal scrolling rules.  This is fine
+                // if the shelf is visible, but if the shelf is hidden, it causes incorrect curling.
+                // notificationClipEnd handles the discrepancy between a visible and hidden shelf,
+                // so we use that when on the keyguard (and while animating away) to reduce curling.
+                final float keyguardSafeShelfStart =
+                        mAmbientState.isOnKeyguard() ? notificationClipEnd : shelfStart;
+                updateCornerRoundnessOnScroll(anv, viewStart, keyguardSafeShelfStart);
             }
         }