I have already set preventCollision=true

Hi Bro can you help me to vertify this problem? @ @torkelo @bryantsai @betalb @ericgibb

It seems that every time the rendering is initialized, the default sorting method is vertical, not null, and the compactType passed by props is not used.

<GridLayout className="layout" cols={48} useCSSTransforms={true} isBounded={false} allowOverlap={true} preventCollision={true} compactType={null} > {this.renderGrid(layout)} </GridLayout>

cause by the function compactItem did not consider the compactType={null} condition:

    if (compactH) {
      resolveCompactionCollision(fullLayout, l, collides.x + collides.w, "x");
    } else {
      resolveCompactionCollision(fullLayout, l, collides.y + collides.h, "y");
    }

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