Add node IDs to the existing selection (shift-click).
Clear all node and edge selections.
Node currently being hovered (null if none).
Remove ids from the node selection (review 4.12: the collapse counterpart to addNodesToSelection).
Currently selected edge IDs.
Replace the entire selection with the given edge IDs.
Currently selected node IDs.
Replace the entire selection with the given node IDs.
Set the hovered node (or null to clear hover).
Toggle a node in/out of selection (ctrl-click).
Add edge IDs to the existing selection.