[Closed] Mouse tool undo problem

Hi, I’m trying to build a mouse tool but can’t figure out why undo doesn’t work after releasing mouse tool.

tool mouseTest
(
    local pixelUnit = (1.0 / gw.getWinSizeX())
    on mousePoint clickNo do
    (
        if clickNo > 2 do
        (
            #stop
        ) 
    )

    on mouseMove clickNo do
    (
        local val = abs (pixelUnit * mouse.screenPos.x)
        if val < 0 then 
        (
            val = 0.0
        )
        else 
            (
                if val > 1.0 do (val = 1.0)
            )

        print val
        $.EditablePoly.setEdgeData 1 val 
    )
)
startTool mouseTest prompt:"start.."