How to cancel the link when it is not connected between two ports?

@Michelle wrote:

Hi,

I noticed that the sample Flow Chart http://gojs.net/beta/samples/flowchart.html has a great feature: when the link is not connected between two ports, the link will be deleted automatically.
I tried to understand the coding of that, but I didn't find the place correspoding to this feature.

Thanks a lot~

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