Notify task changed listeners when a pinned activity is removed

        if (r.isPersistable()) {

            mService.notifyTaskPersisterLocked(this, false);

        }

        if (stack != null && stack.mStackId == PINNED_STACK_ID) {

            // We normally notify listeners of task stack changes on pause, however pinned stack

            // activities are normally in the paused state so no notification will be sent there

            // before the activity is removed. We send it here so instead.

            mService.notifyTaskStackChangedLocked();

        }

        if (mActivities.isEmpty()) {

            return !mReuseTask;

        }