Node graph demo's queue workflow viewer results in ID conflicts

[philpax]

If you create a workflow, queue it up, and then view the queued workflow, the workflow that was queued is shown in a window. Unfortunately, the egui IDs for each node are sourced from the graph node IDs, which are going to be the same for both graphs.

It seems like these should be based on the parent egui IDs, and those should be different, but that doesn't seem to be the case. I think I just need to investigate more; this could be an upstream issue in egui_node_graph2.