Collapse a combo.
Create a combo from selected node IDs.
Optionallabel: stringStaticdeserializeDissolve a combo, releasing its members.
Expand a combo.
Find which combo (if any) a node belongs to.
Get all combos.
Nest a combo inside another.
Serialize for workspace persistence.
Toggle collapsed state.
Apply combos to a UGM for Cytoscape rendering.
Collapsed combos: members hidden, replaced with a summary node. Expanded combos: members get a
parentfield (compound node).