REDRAW_BORDER_R
case REDRAW_BORDER_L|REDRAW_BORDER_R|REDRAW_BORDER_U|REDRAW_BORDER_D:
case REDRAW_BORDER_L|REDRAW_BORDER_R|REDRAW_BORDER_U:
case REDRAW_BORDER_L|REDRAW_BORDER_R|REDRAW_BORDER_D:
case REDRAW_BORDER_L|REDRAW_BORDER_R:
case REDRAW_BORDER_R:
case REDRAW_BORDER_R|REDRAW_BORDER_U|REDRAW_BORDER_D:
case REDRAW_BORDER_R|REDRAW_BORDER_U:
case REDRAW_BORDER_R|REDRAW_BORDER_D:
mask |= REDRAW_BORDER_R;
mask |= REDRAW_BORDER_R;