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I'm not exactly certain what you're trying to achieve. If you want empty bags to hide and all bags around the hidden bag to move together then you could also take a look at my approach, which works perfectly an is easily extendable.
My idea was to save anchoring information for every bag frame. This is not information about which one the bag is anchored to but rather which bags are anchored to the current one (mainly for performance reasons). Then there is a function which does the actual anchoring based on this information whenever it is needed (UpdateButtonPositions).
If that is what you need I can explain my approach further if you want.
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