Fixing issue with transition jump due to wrong insets.

        Rect systemInsets = new Rect();

        ssp.getStableInsets(systemInsets);

        Rect windowRect = ssp.getWindowRect();

        // When docked, the nav bar insets are consumed and the activity is measured without insets.

        // However, the window bounds include the insets, so we need to subtract them here to make

        // them identical.

        if (ssp.hasDockedTask()) {

            windowRect.bottom -= systemInsets.bottom;

            systemInsets.bottom = 0;

        }

        calculateWindowStableInsets(systemInsets, windowRect);

        windowRect.offsetTo(0, 0);

        TaskStackLayoutAlgorithm stackLayout = mDummyStackView.getStackAlgorithm();

        stackLayout.getTaskStackBounds(windowRect, systemInsets.top, systemInsets.right,

                mTaskStackBounds);

        // Rebind the header bar and draw it for the transition

        Rect taskStackBounds = new Rect(mTaskStackBounds);

        stackLayout.setSystemInsets(systemInsets);

        if (stack != null) {

            stackLayout.initialize(windowRect, taskStackBounds,

            stackLayout.getTaskStackBounds(windowRect, systemInsets.top, systemInsets.right,

                    mTaskStackBounds);

            stackLayout.initialize(windowRect, mTaskStackBounds,

                    TaskStackLayoutAlgorithm.StackState.getStackStateForStack(stack));

            mDummyStackView.setTasks(stack, false /* allowNotifyStackChanges */);

        }