In IGV nodes can be selected by clicking on it. When a user selects nodes in a certain view, e.g. "Cluster nodes into blocks" view, and then change to e.g. "Sea of nodes" view, the selection goes away. This is not what we want.

We want:
- The selected nodes should be kept when changing the view, or the properties of the view (e.g. "show neighboring nodes semi-transparent")
- The selected nodes should be kept when changing to a different graph within the SAME group.
- It would also be desired adjust the scroll pane to center the selected nodes when changing view, graph, etc.