Apply root task for launch activity animation.

When launch task embedded, the opening targets will includes the root
task and other TaskFragments, so the animation should choose the root
task as the animating target.

Bug: 279542263
Test: manual, launch task embedded task from notification shade several
times.

Change-Id: I90278e22580b9afb356ab68057bd187f9d59dbc7

packages/SystemUI/animation/src/com/android/systemui/animation/ActivityLaunchAnimator.kt

@@ -508,6 +508,26 @@ class ActivityLaunchAnimator(
             startAnimation(apps, nonApps, callback)
         }
 
+        private fun findRootTaskIfPossible(
+            apps: Array<out RemoteAnimationTarget>?
+        ): RemoteAnimationTarget? {
+            if (apps == null) {
+                return null
+            }
+            var candidate: RemoteAnimationTarget? = null
+            for (it in apps) {
+                if (it.mode == RemoteAnimationTarget.MODE_OPENING) {
+                    if (it.taskInfo != null && !it.hasAnimatingParent) {
+                        return it
+                    }
+                    if (candidate == null) {
+                        candidate = it
+                    }
+                }
+            }
+            return candidate
+        }
+
         private fun startAnimation(
             apps: Array<out RemoteAnimationTarget>?,
             nonApps: Array<out RemoteAnimationTarget>?,
@@ -517,8 +537,7 @@ class ActivityLaunchAnimator(
                 Log.d(TAG, "Remote animation started")
             }
 
-            val window = apps?.firstOrNull { it.mode == RemoteAnimationTarget.MODE_OPENING }
-
+            val window = findRootTaskIfPossible(apps)
             if (window == null) {
                 Log.i(TAG, "Aborting the animation as no window is opening")
                 removeTimeout()