Which library to choose for visual graph editing?

Question

Programming

Actually, about the task - you will need to visually edit the chatbot script that will be launched on api.ai (by the way, am I cycling? I couldn’t google it, but suddenly).
Further - why exactly the graph:
- there are (in terms of api.ai) "intentions" - roughly speaking, each of them represents 1 reaction of the bot to messages similar to the examples indicated
- it is possible to set the context for the "intention" in which the bot will switch by its operation
- it is possible to set the context, which is a necessary condition for the operation of the "intention".
It seems that the task fits perfectly on the graphs. "Intentions" - nodes, contexts define edges. Perhaps - in practice it is worth limiting ourselves to trees, but I would not want to (if only because it is theoretically possible to transfer to one context from several "intentions").
That is, I would like to have a visual graph editor in my software (well, yes - with the ability to get an object tied to a node selected by the user). And of course, I would like a minimum degree of bicycle construction.
As for the languages ​​/ toolkits that I already know a little:
- a little C #, but I used only WinForms
- Python and PyQt
- C ++ / Qt
- javascript - here I even already found gojs.net/latest/samples/flowchart.html(and other options too). However, I would like to find options for one of the first 3, if any.