def add_feather_vertex_slide(MASK_OT_add_feather_vertex=None,
    MASK_OT_slide_point=None):
    """Add new vertex to feather and slide it 

    :param MASK_OT_add_feather_vertex: Add Feather Vertex, Add vertex to feather 
    :param MASK_OT_slide_point: Slide Point, Slide control points 
    """
    pass
