[automerge] Keep showing wallpaper when starting an app immediatly after unlock. 2p: f0a9429cc2 am: ef17fbb23d am: 33cf01cde6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16978905

Change-Id: I5ae72f3143409614923f2ddfc64efe258e367746

services/core/java/com/android/server/wm/WallpaperController.java

@@ -196,8 +196,11 @@ class WallpaperController {
                         "Win " + w + ": token animating, looking behind.");
             }
             mFindResults.setIsWallpaperTargetForLetterbox(w.hasWallpaperForLetterboxBackground());
-            // Found a target! End search.
-            return true;
+            // While the keyguard is going away, both notification shade and a normal activity such
+            // as a launcher can satisfy criteria for a wallpaper target. In this case, we should
+            // chose the normal activity, otherwise wallpaper becomes invisible when a new animation
+            // starts before the keyguard going away animation finishes.
+            return w.mActivityRecord != null;
         }
         return false;
     };