mxgraph - edit existing edges

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i am trying to realize: that i can edit (reconnect to another vertex) an existing edge without selecting it before.

I dont find any solutions for that. My idea, i have to find a way to recognize clicks on start or end of a edge and then delete the old connection manually and start a new connection manually.

But i dont find a way to recognize such click event.

Can u help me? Maybe u can tell me how to recognize such event or you can tell that this function is allready implemented and i just have to activate it with the setting xxxx ;)

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