Function unfixRow

Returns {
    _tag: "RowF";
    bottom: Draw.VStrut;
    cells: Draw.Part[];
    hAlign: "left" | "right" | "center";
    left: Draw.HStrut;
    right: Draw.HStrut;
    top: Draw.VStrut;
    vAlign: "top" | "bottom" | "middle";
}