Merge "Request transition when disposing TF organizer" into udc-qpr-dev

        }

        void dispose() {

            boolean wasVisible = false;

            for (int i = mOrganizedTaskFragments.size() - 1; i >= 0; i--) {

                final TaskFragment taskFragment = mOrganizedTaskFragments.get(i);

                if (taskFragment.isVisibleRequested()) {

                    wasVisible = true;

                }

                // Cleanup the TaskFragmentOrganizer from all TaskFragments it organized before

                // removing the windows to prevent it from adding any additional TaskFragment

                // pending event.

                final TaskFragment taskFragment = mOrganizedTaskFragments.get(i);

                taskFragment.onTaskFragmentOrganizerRemoved();

            }

            final TransitionController transitionController = mAtmService.getTransitionController();

            if (wasVisible && transitionController.isShellTransitionsEnabled()

                    && !transitionController.isCollecting()) {

                final Task task = mOrganizedTaskFragments.get(0).getTask();

                final boolean containsNonEmbeddedActivity =

                        task != null && task.getActivity(a -> !a.isEmbedded()) != null;

                transitionController.requestStartTransition(

                        transitionController.createTransition(WindowManager.TRANSIT_CLOSE),

                        // The task will be removed if all its activities are embedded, then the

                        // task is the trigger.

                        containsNonEmbeddedActivity ? null : task,

                        null /* remoteTransition */, null /* displayChange */);

            }

            // Defer to avoid unnecessary layout when there are multiple TaskFragments removal.

            mAtmService.deferWindowLayout();

            try {