Bind Parent Node Width to Width of All Child Nodes

GoJS
2

That may require a customization of the layout.

Also, as a generalized principle, it might cause issues. If you have a tree that looks like

     A
   B   C
 D  E F  G

B and C would need to become as wide as their children, which means A would need to become as wide as the whole graph. Or is that what you intend?

 AAAAAAAAA
 BBBB CCCC
 D  E F  G