Revert "Don't update task to return to type for last task over home"

This reverts commit 21893824c1.

Original commit revealed issue b/29342752 when launch logic was applied
to incorrect stack while moving to PiP mode.

Bug: 29342752
Bug: 29237751
Change-Id: I88d75399eb4b9daf4de87a9a560eb0df0b515173

services/core/java/com/android/server/am/ActivityStack.java

@@ -2581,14 +2581,11 @@ final class ActivityStack {
     }
 
     private void insertTaskAtTop(TaskRecord task, ActivityRecord newActivity) {
-        boolean isLastTaskOverHome = false;
         // If the moving task is over home stack, transfer its return type to next task
         if (task.isOverHomeStack()) {
             final TaskRecord nextTask = getNextTask(task);
             if (nextTask != null) {
                 nextTask.setTaskToReturnTo(task.getTaskToReturnTo());
-            } else {
-                isLastTaskOverHome = true;
             }
         }
 
@@ -2598,10 +2595,7 @@ final class ActivityStack {
             ActivityStack lastStack = mStackSupervisor.getLastStack();
             final boolean fromHome = lastStack.isHomeStack();
             if (!isHomeStack() && (fromHome || topTask() != task)) {
-                // If it's a last task over home - we default to keep its return to type not to
-                // make underlying task focused when this one will be finished.
-                int returnToType = isLastTaskOverHome
-                        ? task.getTaskToReturnTo() : APPLICATION_ACTIVITY_TYPE;
+                int returnToType = APPLICATION_ACTIVITY_TYPE;
                 if (fromHome && StackId.allowTopTaskToReturnHome(mStackId)) {
                     returnToType = lastStack.topTask() == null
                             ? HOME_ACTIVITY_TYPE : lastStack.topTask().taskType;