Merge "fix an orientation change drawing artifact."

     * 1) buffer orientation/flip/mirror

     * 2) state transformation (window manager)

     * 3) layer orientation (screen orientation)

     * mOrientation is already the composition of (2) and (3)

     * (NOTE: the matrices are multiplied in reverse order)

     */

    const Transform bufferOrientation(mCurrentTransform);

    const Transform& stateTransform(s.transform);

    const Transform layerOrientation(mOrientation);

    const Transform tr(layerOrientation * stateTransform * bufferOrientation);

    const Transform tr(layerOrientation * bufferOrientation);

    // this gives us only the "orientation" component of the transform

    const uint32_t finalTransform = tr.getOrientation();