Make sure to call onTasksAppeared when app transiton is handled.

Bug: 246340474
Test: manual.
   1. start an activity which request permission.
   1. quick switch to other task, and moves back to the previous task
      several times.
   1. check navbar is dispayed and touch works.
Change-Id: Ic698ebd35ac1bf5b4b471c080c11ef571d18a650

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

@@ -1032,8 +1032,12 @@ public class AppTransitionController {
     private void applyAnimations(ArraySet<ActivityRecord> openingApps,
             ArraySet<ActivityRecord> closingApps, @TransitionOldType int transit,
             LayoutParams animLp, boolean voiceInteraction) {
+        final RecentsAnimationController rac = mService.getRecentsAnimationController();
         if (transit == WindowManager.TRANSIT_OLD_UNSET
                 || (openingApps.isEmpty() && closingApps.isEmpty())) {
+            if (rac != null) {
+                rac.sendTasksAppeared();
+            }
             return;
         }
 
@@ -1071,7 +1075,6 @@ public class AppTransitionController {
                 voiceInteraction);
         applyAnimations(closingWcs, closingApps, transit, false /* visible */, animLp,
                 voiceInteraction);
-        final RecentsAnimationController rac = mService.getRecentsAnimationController();
         if (rac != null) {
             rac.sendTasksAppeared();
         }