Manipulating the graph: Undo/redo
You now have the possibility to revert your last action on a visualization.
You can revert only the last action you do in the visualization.
For example, after expanding a node, clicking the undo button
(or using the shortcut ctrl-z or cmd-z on MacOS) will revert the expand by returning the graph to its previous state.

After reverting the expand, you can go back and re-run it by clicking on the redo button (or using the shortcut ctrl-y or cmd-y on MacOS).

We have now the same nodes in the same positions as before.

Some actions cannot currently be undone :
- Changing the caption settings of the visualization
- Changing the styles of the visualization