Merge "Remove the previous animation split tasks container when recreating" into sc-v2-dev

    private final Provider<Optional<StageTaskUnfoldController>> mUnfoldControllerProvider;

    private StageCoordinator mStageCoordinator;

    // Only used for the legacy recents animation from splitscreen to allow the tasks to be animated

    // outside the bounds of the roots by being reparented into a higher level fullscreen container

    private SurfaceControl mSplitTasksContainerLayer;

    public SplitScreenController(ShellTaskOrganizer shellTaskOrganizer,

            SyncTransactionQueue syncQueue, Context context,

    RemoteAnimationTarget[] onGoingToRecentsLegacy(boolean cancel, RemoteAnimationTarget[] apps) {

        if (apps.length < 2) return null;

        SurfaceControl.Transaction transaction = new SurfaceControl.Transaction();

        if (mSplitTasksContainerLayer != null) {

            // Remove the previous layer before recreating

            transaction.remove(mSplitTasksContainerLayer);

        }

        final SurfaceControl.Builder builder = new SurfaceControl.Builder(new SurfaceSession())

                .setContainerLayer()

                .setName("RecentsAnimationSplitTasks")

                .setHidden(false)

                .setCallsite("SplitScreenController#onGoingtoRecentsLegacy");

        mRootTDAOrganizer.attachToDisplayArea(DEFAULT_DISPLAY, builder);

        SurfaceControl sc = builder.build();

        SurfaceControl.Transaction transaction = new SurfaceControl.Transaction();

        mSplitTasksContainerLayer = builder.build();

        // Ensure that we order these in the parent in the right z-order as their previous order

        Arrays.sort(apps, (a1, a2) -> a1.prefixOrderIndex - a2.prefixOrderIndex);

        int layer = 1;

        for (RemoteAnimationTarget appTarget : apps) {

            transaction.reparent(appTarget.leash, sc);

            transaction.reparent(appTarget.leash, mSplitTasksContainerLayer);

            transaction.setPosition(appTarget.leash, appTarget.screenSpaceBounds.left,

                    appTarget.screenSpaceBounds.top);

            transaction.setLayer(appTarget.leash, layer++);