Details Panel Bug - Multiple external objects of same type share expansion state

This is because expansion state is saved per class, and we are displaying multiple objects of the same class at the same type.

The UniqueID we add when adding these objects via 'AddExternalObject' or 'AddExternalObjectProperty' is used for expansion of just that row, not the children rows that are automatically generated that still use the default class expansion path.

One suggested fix would work by treating the UniqueID and following properties as an 'extension' of the original owning object, so

VectorArrayDI.Array = true becomes

NiagaraSystem.UserParameters.VectorArrayDI_01.Array = true

Create an empty Niagara System

Add multiple Vector Arrays in the User Parameters tab

Collapse 1 array (not the entire user parameter)

Copy paste from one value into another in another User Parameter Array

Observe expansion state for the first collapsed array.

It is possible that arrays/properties will expand or collapse that haven't been modified (play around with this a little).

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