Just return the task to the pool if it is not in the current stack.

        for (int i = taskViewCount - 1; i >= 0; i--) {

            TaskView tv = taskViews.get(i);

            Task task = tv.getTask();

            int taskIndex = mStack.indexOfStackTask(task);

            TaskViewTransform transform = mCurrentTaskTransforms.get(taskIndex);

            // Skip ignored tasks

            if (ignoreTasksSet.contains(task.key)) {

                continue;

            }

            if (task.isFreeformTask() || transform.visible) {

            // It is possible for the set of lingering TaskViews to differ from the stack if the

            // stack was updated before the relayout.  If the task view is no longer in the stack,

            // then just return it back to the view pool.

            int taskIndex = mStack.indexOfStackTask(task);

            TaskViewTransform transform = null;

            if (taskIndex != -1) {

                transform = mCurrentTaskTransforms.get(taskIndex);

            }

            if (task.isFreeformTask() || (transform != null && transform.visible)) {

                mTmpTaskViewMap.put(task.key, tv);

            } else {

                if (mTouchExplorationEnabled) {