I’m considering taking on porting this the v7. Have you done an assessment of what would be involved? I’m pretty new to this add-on, the dependent libraries and Vaadin in general, but would love to use this in my app.
Updating the client–server communication would be the biggest thing. Changing the GWT animations to CSS 3 transitions would be another.
Feel free to fork the project on GitHub: https://github.com/vaadin/Graph-Explorer/fork_select