The surface state a connector's end drag publishes, under CONNECT_STATE_KEY: every shape drawn on the surface shows its connection sites while it is set, and the site the end would glue to if released now is marked.
The movable whose end is being dragged, by id.
The site on that movable, numbered as IShape.IConnectorFormat takes it.
IShape.IConnectorFormat
The movable the end would glue to, by id; null when it would be free.
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The surface state a connector's end drag publishes, under CONNECT_STATE_KEY: every shape drawn on the surface shows its connection sites while it is set, and the site the end would glue to if released now is marked.