Merge "Make sure to clear previous display's last focus window when...

                // removing from parent.

                token.getParent().removeChild(token);

            }

            if (prevDc.mLastFocus == mCurrentFocus) {

                // The window has become the focus of this display, so it should not be notified

                // that it lost focus from the previous display.

            if (token.hasChild(prevDc.mLastFocus)) {

                // If the reparent window token contains previous display's last focus window, means

                // it will end up to gain window focus on the target display, so it should not be

                // notified that it lost focus from the previous display.

                prevDc.mLastFocus = null;

            }

        }