Merge "Desks: Allow restoring desk root tasks on user switch" into main

        if (DesktopModeFlags.ENABLE_TOP_VISIBLE_ROOT_TASK_PER_USER_TRACKING.isTrue()) {

            final IntArray visibleRootTasks = new IntArray();

            forAllRootTasks(rootTask -> {

                if ((mCurrentUser == rootTask.mUserId || rootTask.showForAllUsers())

                        && rootTask.isVisible()) {

                final boolean restoreTask;

                if (DesktopExperienceFlags.ENABLE_MULTIPLE_DESKTOPS_BACKEND.isTrue()) {

                    // If the task is visible, it should have activities that are visible to

                    // the current user, so don't check for task's user id since it is

                    // redundant and might accidentally exclude a non-leaf tasks that

                    // aren't associated with one particular user.

                    restoreTask = rootTask.isVisible();

                } else {

                    restoreTask = (mCurrentUser == rootTask.mUserId || rootTask.showForAllUsers())

                            && rootTask.isVisible();

                }

                if (restoreTask) {

                    visibleRootTasks.add(rootTask.getRootTaskId());

                }

            }, /* traverseTopToBottom */ false);