Subobject editor collapsed nodes are auto expanded when adding or moving a node

Node operations cause all of the collapsed nodes to be auto expanded. This is disruptive when working with complex hierarchies because you can't hide irrelevant components.

1. Create a Blueprint with some nested components using the Blueprint Subobject Editor
2. Collapse some of the nodes in the tree
3. Add a new component, or drag and drop a node to change the hierarchy
4. Note that all of the nodes are expanded