Merge "Gallery: fix white screen after rapid scrolling"

            float distance = mVelocity * mVelocity / (2.0f * Math.abs(mDeceleration));

            final float sign = Math.signum(mVelocity);

            if (distance > mOver) {

            if (Math.abs(distance) > mOver) {

                // Default deceleration is not sufficient to slow us down before boundary

                 mDeceleration = - sign * mVelocity * mVelocity / (2.0f * mOver);

                 distance = mOver;