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    Interface NestIntoFrameOptions

    interface NestIntoFrameOptions {
        excluded: Set<number>;
        fromDrag?: boolean;
        index: number;
        parent: Element2D;
        pointer: Vector2Like;
    }
    Index
    excluded: Set<number>
    fromDrag?: boolean

    During a live drag: flex frames are owned by flexLayout, so skip them here (avoids double moveChild). Omitted for one-shot drops (new nodes / paste), where we DO insert into flex at the main-axis index.

    index: number
    parent: Element2D
    pointer: Vector2Like