Move focus to visible behind activity when we move the home task back

        if (DEBUG_TRANSITION) Slog.v(TAG_TRANSITION, "Prepare to back transition: task=" + taskId);

        if (mStackId == HOME_STACK_ID && topTask().isHomeTask()) {

            // For the case where we are moving the home task back and there is an activity visible

            // behind it on the fullscreen stack, we want to move the focus to the visible behind

            // activity to maintain order with what the user is seeing.

            final ActivityStack fullscreenStack =

                    mStackSupervisor.getStack(FULLSCREEN_WORKSPACE_STACK_ID);

            if (fullscreenStack != null && fullscreenStack.hasVisibleBehindActivity()) {

                final ActivityRecord visibleBehind = fullscreenStack.getVisibleBehindActivity();

                mService.setFocusedActivityLocked(visibleBehind, "moveTaskToBack");

                mStackSupervisor.resumeTopActivitiesLocked(fullscreenStack, null, null);

                return true;

            }

        }

        boolean prevIsHome = false;

        // If true, we should resume the home activity next if the task we are moving to the